--- /dev/null
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
+using Internal.Runtime.CompilerServices;
+
+#pragma warning disable 0809 //warning CS0809: Obsolete member 'Span<T>.Equals(object)' overrides non-obsolete member 'object.Equals(object)'
+
+#if BIT64
+using nuint = System.UInt64;
+#else
+using nuint = System.UInt32;
+#endif
+
+namespace System
+{
+ /// <summary>
+ /// ReadOnlySpan represents a contiguous region of arbitrary memory. Unlike arrays, it can point to either managed
+ /// or native memory, or to memory allocated on the stack. It is type- and memory-safe.
+ /// </summary>
+ [DebuggerTypeProxy(typeof(SpanDebugView<>))]
+ [DebuggerDisplay("{DebuggerDisplay,nq}")]
+ [NonVersionable]
+ public readonly ref partial struct ReadOnlySpan<T>
+ {
+ /// <summary>A byref or a native ptr.</summary>
+ internal readonly ByReference<T> _pointer;
+ /// <summary>The number of elements this ReadOnlySpan contains.</summary>
+#if PROJECTN
+ [Bound]
+#endif
+ private readonly int _length;
+
+ /// <summary>
+ /// Creates a new read-only span over the entirety of the target array.
+ /// </summary>
+ /// <param name="array">The target array.</param>
+ /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
+ /// reference (Nothing in Visual Basic).</exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public ReadOnlySpan(T[] array)
+ {
+ if (array == null)
+ ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
+
+ _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()));
+ _length = array.Length;
+ }
+
+ /// <summary>
+ /// Creates a new read-only span over the portion of the target array beginning
+ /// at 'start' index and ending at 'end' index (exclusive).
+ /// </summary>
+ /// <param name="array">The target array.</param>
+ /// <param name="start">The index at which to begin the read-only span.</param>
+ /// <param name="length">The number of items in the read-only span.</param>
+ /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
+ /// reference (Nothing in Visual Basic).</exception>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> or end index is not in the range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public ReadOnlySpan(T[] array, int start, int length)
+ {
+ if (array == null)
+ ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
+ if ((uint)start > (uint)array.Length || (uint)length > (uint)(array.Length - start))
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ _pointer = new ByReference<T>(ref Unsafe.Add(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()), start));
+ _length = length;
+ }
+
+ /// <summary>
+ /// Creates a new read-only span over the target unmanaged buffer. Clearly this
+ /// is quite dangerous, because we are creating arbitrarily typed T's
+ /// out of a void*-typed block of memory. And the length is not checked.
+ /// But if this creation is correct, then all subsequent uses are correct.
+ /// </summary>
+ /// <param name="pointer">An unmanaged pointer to memory.</param>
+ /// <param name="length">The number of <typeparamref name="T"/> elements the memory contains.</param>
+ /// <exception cref="System.ArgumentException">
+ /// Thrown when <typeparamref name="T"/> is reference type or contains pointers and hence cannot be stored in unmanaged memory.
+ /// </exception>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="length"/> is negative.
+ /// </exception>
+ [CLSCompliant(false)]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public unsafe ReadOnlySpan(void* pointer, int length)
+ {
+ if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
+ ThrowHelper.ThrowInvalidTypeWithPointersNotSupported(typeof(T));
+ if (length < 0)
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref *(byte*)pointer));
+ _length = length;
+ }
+
+ // Constructor for internal use only.
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ internal ReadOnlySpan(ref T ptr, int length)
+ {
+ Debug.Assert(length >= 0);
+
+ _pointer = new ByReference<T>(ref ptr);
+ _length = length;
+ }
+
+ /// <summary>
+ /// Returns the specified element of the read-only span.
+ /// </summary>
+ /// <param name="index"></param>
+ /// <returns></returns>
+ /// <exception cref="System.IndexOutOfRangeException">
+ /// Thrown when index less than 0 or index greater than or equal to Length
+ /// </exception>
+ public ref readonly T this[int index]
+ {
+#if PROJECTN
+ [BoundsChecking]
+ get
+ {
+ return ref Unsafe.Add(ref _pointer.Value, index);
+ }
+#else
+ [Intrinsic]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ [NonVersionable]
+ get
+ {
+ if ((uint)index >= (uint)_length)
+ ThrowHelper.ThrowIndexOutOfRangeException();
+ return ref Unsafe.Add(ref _pointer.Value, index);
+ }
+#endif
+ }
+
+ /// <summary>
+ /// Copies the contents of this read-only span into destination span. If the source
+ /// and destinations overlap, this method behaves as if the original values in
+ /// a temporary location before the destination is overwritten.
+ ///
+ /// <param name="destination">The span to copy items into.</param>
+ /// <exception cref="System.ArgumentException">
+ /// Thrown when the destination Span is shorter than the source Span.
+ /// </exception>
+ /// </summary>
+ public void CopyTo(Span<T> destination)
+ {
+ // Using "if (!TryCopyTo(...))" results in two branches: one for the length
+ // check, and one for the result of TryCopyTo. Since these checks are equivalent,
+ // we can optimize by performing the check once ourselves then calling Memmove directly.
+
+ if ((uint)_length <= (uint)destination.Length)
+ {
+ Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
+ }
+ else
+ {
+ ThrowHelper.ThrowArgumentException_DestinationTooShort();
+ }
+ }
+
+ /// Copies the contents of this read-only span into destination span. If the source
+ /// and destinations overlap, this method behaves as if the original values in
+ /// a temporary location before the destination is overwritten.
+ /// </summary>
+ /// <returns>If the destination span is shorter than the source span, this method
+ /// return false and no data is written to the destination.</returns>
+ /// <param name="destination">The span to copy items into.</param>
+ public bool TryCopyTo(Span<T> destination)
+ {
+ bool retVal = false;
+ if ((uint)_length <= (uint)destination.Length)
+ {
+ Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
+ retVal = true;
+ }
+ return retVal;
+ }
+
+ /// <summary>
+ /// Returns true if left and right point at the same memory and have the same length. Note that
+ /// this does *not* check to see if the *contents* are equal.
+ /// </summary>
+ public static bool operator ==(ReadOnlySpan<T> left, ReadOnlySpan<T> right)
+ {
+ return left._length == right._length && Unsafe.AreSame<T>(ref left._pointer.Value, ref right._pointer.Value);
+ }
+
+ /// <summary>
+ /// For <see cref="ReadOnlySpan{Char}"/>, returns a new instance of string that represents the characters pointed to by the span.
+ /// Otherwise, returns a <see cref="String"/> with the name of the type and the number of elements.
+ /// </summary>
+ public override string ToString()
+ {
+ if (typeof(T) == typeof(char))
+ {
+ unsafe
+ {
+ fixed (char* src = &Unsafe.As<T, char>(ref _pointer.Value))
+ return new string(src, 0, _length);
+ }
+ }
+ return string.Format("System.ReadOnlySpan<{0}>[{1}]", typeof(T).Name, _length);
+ }
+
+ /// <summary>
+ /// Forms a slice out of the given read-only span, beginning at 'start'.
+ /// </summary>
+ /// <param name="start">The index at which to begin this slice.</param>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> index is not in range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public ReadOnlySpan<T> Slice(int start)
+ {
+ if ((uint)start > (uint)_length)
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ return new ReadOnlySpan<T>(ref Unsafe.Add(ref _pointer.Value, start), _length - start);
+ }
+
+ /// <summary>
+ /// Forms a slice out of the given read-only span, beginning at 'start', of given length
+ /// </summary>
+ /// <param name="start">The index at which to begin this slice.</param>
+ /// <param name="length">The desired length for the slice (exclusive).</param>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> or end index is not in range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public ReadOnlySpan<T> Slice(int start, int length)
+ {
+ if ((uint)start > (uint)_length || (uint)length > (uint)(_length - start))
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ return new ReadOnlySpan<T>(ref Unsafe.Add(ref _pointer.Value, start), length);
+ }
+
+ /// <summary>
+ /// Copies the contents of this read-only span into a new array. This heap
+ /// allocates, so should generally be avoided, however it is sometimes
+ /// necessary to bridge the gap with APIs written in terms of arrays.
+ /// </summary>
+ public T[] ToArray()
+ {
+ if (_length == 0)
+ return Array.Empty<T>();
+
+ var destination = new T[_length];
+ Buffer.Memmove(ref Unsafe.As<byte, T>(ref destination.GetRawSzArrayData()), ref _pointer.Value, (nuint)_length);
+ return destination;
+ }
+ }
+}
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
+#if !FEATURE_PORTABLE_SPAN
using System.Runtime.Versioning;
-using Internal.Runtime.CompilerServices;
+#endif // !FEATURE_PORTABLE_SPAN
#pragma warning disable 0809 //warning CS0809: Obsolete member 'Span<T>.Equals(object)' overrides non-obsolete member 'object.Equals(object)'
-#if BIT64
-using nuint = System.UInt64;
-#else
-using nuint = System.UInt32;
-#endif
-
namespace System
{
/// <summary>
/// </summary>
[DebuggerTypeProxy(typeof(SpanDebugView<>))]
[DebuggerDisplay("{DebuggerDisplay,nq}")]
- [NonVersionable]
- public readonly ref struct ReadOnlySpan<T>
+ public readonly ref partial struct ReadOnlySpan<T>
{
- /// <summary>A byref or a native ptr.</summary>
- internal readonly ByReference<T> _pointer;
- /// <summary>The number of elements this ReadOnlySpan contains.</summary>
-#if PROJECTN
- [Bound]
-#endif
- private readonly int _length;
-
- /// <summary>
- /// Creates a new read-only span over the entirety of the target array.
- /// </summary>
- /// <param name="array">The target array.</param>
- /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
- /// reference (Nothing in Visual Basic).</exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public ReadOnlySpan(T[] array)
- {
- if (array == null)
- ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
-
- _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()));
- _length = array.Length;
- }
-
- /// <summary>
- /// Creates a new read-only span over the portion of the target array beginning
- /// at 'start' index and ending at 'end' index (exclusive).
- /// </summary>
- /// <param name="array">The target array.</param>
- /// <param name="start">The index at which to begin the read-only span.</param>
- /// <param name="length">The number of items in the read-only span.</param>
- /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
- /// reference (Nothing in Visual Basic).</exception>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> or end index is not in the range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public ReadOnlySpan(T[] array, int start, int length)
- {
- if (array == null)
- ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
- if ((uint)start > (uint)array.Length || (uint)length > (uint)(array.Length - start))
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- _pointer = new ByReference<T>(ref Unsafe.Add(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()), start));
- _length = length;
- }
-
- /// <summary>
- /// Creates a new read-only span over the target unmanaged buffer. Clearly this
- /// is quite dangerous, because we are creating arbitrarily typed T's
- /// out of a void*-typed block of memory. And the length is not checked.
- /// But if this creation is correct, then all subsequent uses are correct.
- /// </summary>
- /// <param name="pointer">An unmanaged pointer to memory.</param>
- /// <param name="length">The number of <typeparamref name="T"/> elements the memory contains.</param>
- /// <exception cref="System.ArgumentException">
- /// Thrown when <typeparamref name="T"/> is reference type or contains pointers and hence cannot be stored in unmanaged memory.
- /// </exception>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="length"/> is negative.
- /// </exception>
- [CLSCompliant(false)]
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public unsafe ReadOnlySpan(void* pointer, int length)
- {
- if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
- ThrowHelper.ThrowInvalidTypeWithPointersNotSupported(typeof(T));
- if (length < 0)
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref *(byte*)pointer));
- _length = length;
- }
-
- // Constructor for internal use only.
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- internal ReadOnlySpan(ref T ptr, int length)
- {
- Debug.Assert(length >= 0);
-
- _pointer = new ByReference<T>(ref ptr);
- _length = length;
- }
-
/// <summary>
/// The number of items in the read-only span.
/// </summary>
public int Length
{
+#if !FEATURE_PORTABLE_SPAN
[NonVersionable]
- get
- {
- return _length;
- }
- }
+#endif // !FEATURE_PORTABLE_SPAN
+ get
+ {
+ return _length;
+ }
+ }
/// <summary>
/// Returns true if Length is 0.
/// </summary>
public bool IsEmpty
{
+#if !FEATURE_PORTABLE_SPAN
[NonVersionable]
+#endif // !FEATURE_PORTABLE_SPAN
get
{
return _length == 0;
}
}
-
- /// <summary>
- /// Returns the specified element of the read-only span.
- /// </summary>
- /// <param name="index"></param>
- /// <returns></returns>
- /// <exception cref="System.IndexOutOfRangeException">
- /// Thrown when index less than 0 or index greater than or equal to Length
- /// </exception>
- public ref readonly T this[int index]
- {
-#if PROJECTN
- [BoundsChecking]
- get
- {
- return ref Unsafe.Add(ref _pointer.Value, index);
- }
-#else
- [Intrinsic]
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- [NonVersionable]
- get
- {
- if ((uint)index >= (uint)_length)
- ThrowHelper.ThrowIndexOutOfRangeException();
- return ref Unsafe.Add(ref _pointer.Value, index);
- }
-#endif
- }
-
- /// <summary>
- /// Copies the contents of this read-only span into destination span. If the source
- /// and destinations overlap, this method behaves as if the original values in
- /// a temporary location before the destination is overwritten.
- ///
- /// <param name="destination">The span to copy items into.</param>
- /// <exception cref="System.ArgumentException">
- /// Thrown when the destination Span is shorter than the source Span.
- /// </exception>
- /// </summary>
- public void CopyTo(Span<T> destination)
- {
- // Using "if (!TryCopyTo(...))" results in two branches: one for the length
- // check, and one for the result of TryCopyTo. Since these checks are equivalent,
- // we can optimize by performing the check once ourselves then calling Memmove directly.
-
- if ((uint)_length <= (uint)destination.Length)
- {
- Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
- }
- else
- {
- ThrowHelper.ThrowArgumentException_DestinationTooShort();
- }
- }
-
- /// Copies the contents of this read-only span into destination span. If the source
- /// and destinations overlap, this method behaves as if the original values in
- /// a temporary location before the destination is overwritten.
- /// </summary>
- /// <returns>If the destination span is shorter than the source span, this method
- /// return false and no data is written to the destination.</returns>
- /// <param name="destination">The span to copy items into.</param>
- public bool TryCopyTo(Span<T> destination)
- {
- bool retVal = false;
- if ((uint)_length <= (uint)destination.Length)
- {
- Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
- retVal = true;
- }
- return retVal;
- }
-
- /// <summary>
- /// Returns true if left and right point at the same memory and have the same length. Note that
- /// this does *not* check to see if the *contents* are equal.
- /// </summary>
- public static bool operator ==(ReadOnlySpan<T> left, ReadOnlySpan<T> right)
- {
- return left._length == right._length && Unsafe.AreSame<T>(ref left._pointer.Value, ref right._pointer.Value);
- }
-
/// <summary>
/// Returns false if left and right point at the same memory and have the same length. Note that
/// this does *not* check to see if the *contents* are equal.
}
/// <summary>
- /// For <see cref="ReadOnlySpan{Char}"/>, returns a new instance of string that represents the characters pointed to by the span.
- /// Otherwise, returns a <see cref="String"/> with the name of the type and the number of elements.
- /// </summary>
- public override string ToString()
- {
- if (typeof(T) == typeof(char))
- {
- unsafe
- {
- fixed (char* src = &Unsafe.As<T, char>(ref _pointer.Value))
- return new string(src, 0, _length);
- }
- }
- return string.Format("System.ReadOnlySpan<{0}>[{1}]", typeof(T).Name, _length);
- }
-
- /// <summary>
/// Defines an implicit conversion of an array to a <see cref="ReadOnlySpan{T}"/>
/// </summary>
public static implicit operator ReadOnlySpan<T>(T[] array) => array != null ? new ReadOnlySpan<T>(array) : default;
=> arraySegment.Array != null ? new ReadOnlySpan<T>(arraySegment.Array, arraySegment.Offset, arraySegment.Count) : default;
/// <summary>
- /// Forms a slice out of the given read-only span, beginning at 'start'.
- /// </summary>
- /// <param name="start">The index at which to begin this slice.</param>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> index is not in range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public ReadOnlySpan<T> Slice(int start)
- {
- if ((uint)start > (uint)_length)
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- return new ReadOnlySpan<T>(ref Unsafe.Add(ref _pointer.Value, start), _length - start);
- }
-
- /// <summary>
- /// Forms a slice out of the given read-only span, beginning at 'start', of given length
- /// </summary>
- /// <param name="start">The index at which to begin this slice.</param>
- /// <param name="length">The desired length for the slice (exclusive).</param>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> or end index is not in range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public ReadOnlySpan<T> Slice(int start, int length)
- {
- if ((uint)start > (uint)_length || (uint)length > (uint)(_length - start))
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- return new ReadOnlySpan<T>(ref Unsafe.Add(ref _pointer.Value, start), length);
- }
-
- /// <summary>
- /// Copies the contents of this read-only span into a new array. This heap
- /// allocates, so should generally be avoided, however it is sometimes
- /// necessary to bridge the gap with APIs written in terms of arrays.
- /// </summary>
- public T[] ToArray()
- {
- if (_length == 0)
- return Array.Empty<T>();
-
- var destination = new T[_length];
- Buffer.Memmove(ref Unsafe.As<byte, T>(ref destination.GetRawSzArrayData()), ref _pointer.Value, (nuint)_length);
- return destination;
- }
-
- /// <summary>
/// Returns a 0-length read-only span whose base is the null pointer.
/// </summary>
public static ReadOnlySpan<T> Empty => default(ReadOnlySpan<T>);
--- /dev/null
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
+using Internal.Runtime.CompilerServices;
+
+#pragma warning disable 0809 //warning CS0809: Obsolete member 'Span<T>.Equals(object)' overrides non-obsolete member 'object.Equals(object)'
+
+#if BIT64
+using nuint = System.UInt64;
+#else
+using nuint = System.UInt32;
+#endif
+
+namespace System
+{
+ /// <summary>
+ /// Span represents a contiguous region of arbitrary memory. Unlike arrays, it can point to either managed
+ /// or native memory, or to memory allocated on the stack. It is type- and memory-safe.
+ /// </summary>
+ [DebuggerTypeProxy(typeof(SpanDebugView<>))]
+ [DebuggerDisplay("{DebuggerDisplay,nq}")]
+ [NonVersionable]
+ public readonly ref partial struct Span<T>
+ {
+ /// <summary>A byref or a native ptr.</summary>
+ internal readonly ByReference<T> _pointer;
+ /// <summary>The number of elements this Span contains.</summary>
+#if PROJECTN
+ [Bound]
+#endif
+ private readonly int _length;
+
+ /// <summary>
+ /// Creates a new span over the entirety of the target array.
+ /// </summary>
+ /// <param name="array">The target array.</param>
+ /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
+ /// reference (Nothing in Visual Basic).</exception>
+ /// <exception cref="System.ArrayTypeMismatchException">Thrown when <paramref name="array"/> is covariant and array's type is not exactly T[].</exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public Span(T[] array)
+ {
+ if (array == null)
+ ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
+ if (default(T) == null && array.GetType() != typeof(T[]))
+ ThrowHelper.ThrowArrayTypeMismatchException();
+
+ _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()));
+ _length = array.Length;
+ }
+
+ /// <summary>
+ /// Creates a new span over the portion of the target array beginning
+ /// at 'start' index and ending at 'end' index (exclusive).
+ /// </summary>
+ /// <param name="array">The target array.</param>
+ /// <param name="start">The index at which to begin the span.</param>
+ /// <param name="length">The number of items in the span.</param>
+ /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
+ /// reference (Nothing in Visual Basic).</exception>
+ /// <exception cref="System.ArrayTypeMismatchException">Thrown when <paramref name="array"/> is covariant and array's type is not exactly T[].</exception>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> or end index is not in the range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public Span(T[] array, int start, int length)
+ {
+ if (array == null)
+ ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
+ if (default(T) == null && array.GetType() != typeof(T[]))
+ ThrowHelper.ThrowArrayTypeMismatchException();
+ if ((uint)start > (uint)array.Length || (uint)length > (uint)(array.Length - start))
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ _pointer = new ByReference<T>(ref Unsafe.Add(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()), start));
+ _length = length;
+ }
+
+ /// <summary>
+ /// Creates a new span over the target unmanaged buffer. Clearly this
+ /// is quite dangerous, because we are creating arbitrarily typed T's
+ /// out of a void*-typed block of memory. And the length is not checked.
+ /// But if this creation is correct, then all subsequent uses are correct.
+ /// </summary>
+ /// <param name="pointer">An unmanaged pointer to memory.</param>
+ /// <param name="length">The number of <typeparamref name="T"/> elements the memory contains.</param>
+ /// <exception cref="System.ArgumentException">
+ /// Thrown when <typeparamref name="T"/> is reference type or contains pointers and hence cannot be stored in unmanaged memory.
+ /// </exception>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="length"/> is negative.
+ /// </exception>
+ [CLSCompliant(false)]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public unsafe Span(void* pointer, int length)
+ {
+ if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
+ ThrowHelper.ThrowInvalidTypeWithPointersNotSupported(typeof(T));
+ if (length < 0)
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref *(byte*)pointer));
+ _length = length;
+ }
+
+ // Constructor for internal use only.
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ internal Span(ref T ptr, int length)
+ {
+ Debug.Assert(length >= 0);
+
+ _pointer = new ByReference<T>(ref ptr);
+ _length = length;
+ }
+
+ /// Returns a reference to specified element of the Span.
+ /// </summary>
+ /// <param name="index"></param>
+ /// <returns></returns>
+ /// <exception cref="System.IndexOutOfRangeException">
+ /// Thrown when index less than 0 or index greater than or equal to Length
+ /// </exception>
+ public ref T this[int index]
+ {
+#if PROJECTN
+ [BoundsChecking]
+ get
+ {
+ return ref Unsafe.Add(ref _pointer.Value, index);
+ }
+#else
+ [Intrinsic]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ [NonVersionable]
+ get
+ {
+ if ((uint)index >= (uint)_length)
+ ThrowHelper.ThrowIndexOutOfRangeException();
+ return ref Unsafe.Add(ref _pointer.Value, index);
+ }
+#endif
+ }
+
+ /// <summary>
+ /// Clears the contents of this span.
+ /// </summary>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public void Clear()
+ {
+ if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
+ {
+ Span.ClearWithReferences(ref Unsafe.As<T, IntPtr>(ref _pointer.Value), (nuint)_length * (nuint)(Unsafe.SizeOf<T>() / sizeof(nuint)));
+ }
+ else
+ {
+ Span.ClearWithoutReferences(ref Unsafe.As<T, byte>(ref _pointer.Value), (nuint)_length * (nuint)Unsafe.SizeOf<T>());
+ }
+ }
+
+ /// <summary>
+ /// Fills the contents of this span with the given value.
+ /// </summary>
+ public void Fill(T value)
+ {
+ if (Unsafe.SizeOf<T>() == 1)
+ {
+ uint length = (uint)_length;
+ if (length == 0)
+ return;
+
+ T tmp = value; // Avoid taking address of the "value" argument. It would regress performance of the loop below.
+ Unsafe.InitBlockUnaligned(ref Unsafe.As<T, byte>(ref _pointer.Value), Unsafe.As<T, byte>(ref tmp), length);
+ }
+ else
+ {
+ // Do all math as nuint to avoid unnecessary 64->32->64 bit integer truncations
+ nuint length = (uint)_length;
+ if (length == 0)
+ return;
+
+ ref T r = ref _pointer.Value;
+
+ // TODO: Create block fill for value types of power of two sizes e.g. 2,4,8,16
+
+ nuint elementSize = (uint)Unsafe.SizeOf<T>();
+ nuint i = 0;
+ for (; i < (length & ~(nuint)7); i += 8)
+ {
+ Unsafe.AddByteOffset<T>(ref r, (i + 0) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 1) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 2) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 3) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 4) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 5) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 6) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 7) * elementSize) = value;
+ }
+ if (i < (length & ~(nuint)3))
+ {
+ Unsafe.AddByteOffset<T>(ref r, (i + 0) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 1) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 2) * elementSize) = value;
+ Unsafe.AddByteOffset<T>(ref r, (i + 3) * elementSize) = value;
+ i += 4;
+ }
+ for (; i < length; i++)
+ {
+ Unsafe.AddByteOffset<T>(ref r, i * elementSize) = value;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Copies the contents of this span into destination span. If the source
+ /// and destinations overlap, this method behaves as if the original values in
+ /// a temporary location before the destination is overwritten.
+ /// </summary>
+ /// <param name="destination">The span to copy items into.</param>
+ /// <exception cref="System.ArgumentException">
+ /// Thrown when the destination Span is shorter than the source Span.
+ /// </exception>
+ public void CopyTo(Span<T> destination)
+ {
+ // Using "if (!TryCopyTo(...))" results in two branches: one for the length
+ // check, and one for the result of TryCopyTo. Since these checks are equivalent,
+ // we can optimize by performing the check once ourselves then calling Memmove directly.
+
+ if ((uint)_length <= (uint)destination.Length)
+ {
+ Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
+ }
+ else
+ {
+ ThrowHelper.ThrowArgumentException_DestinationTooShort();
+ }
+ }
+
+ /// <summary>
+ /// Copies the contents of this span into destination span. If the source
+ /// and destinations overlap, this method behaves as if the original values in
+ /// a temporary location before the destination is overwritten.
+ /// </summary>
+ /// <param name="destination">The span to copy items into.</param>
+ /// <returns>If the destination span is shorter than the source span, this method
+ /// return false and no data is written to the destination.</returns>
+ public bool TryCopyTo(Span<T> destination)
+ {
+ bool retVal = false;
+ if ((uint)_length <= (uint)destination.Length)
+ {
+ Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
+ retVal = true;
+ }
+ return retVal;
+ }
+
+ /// <summary>
+ /// Returns true if left and right point at the same memory and have the same length. Note that
+ /// this does *not* check to see if the *contents* are equal.
+ /// </summary>
+ public static bool operator ==(Span<T> left, Span<T> right)
+ {
+ return left._length == right._length && Unsafe.AreSame<T>(ref left._pointer.Value, ref right._pointer.Value);
+ }
+
+ /// <summary>
+ /// Defines an implicit conversion of a <see cref="Span{T}"/> to a <see cref="ReadOnlySpan{T}"/>
+ /// </summary>
+ public static implicit operator ReadOnlySpan<T>(Span<T> span) => new ReadOnlySpan<T>(ref span._pointer.Value, span._length);
+
+ /// <summary>
+ /// For <see cref="Span{Char}"/>, returns a new instance of string that represents the characters pointed to by the span.
+ /// Otherwise, returns a <see cref="String"/> with the name of the type and the number of elements.
+ /// </summary>
+ public override string ToString()
+ {
+ if (typeof(T) == typeof(char))
+ {
+ unsafe
+ {
+ fixed (char* src = &Unsafe.As<T, char>(ref _pointer.Value))
+ return new string(src, 0, _length);
+ }
+ }
+ return string.Format("System.Span<{0}>[{1}]", typeof(T).Name, _length);
+ }
+
+ /// <summary>
+ /// Forms a slice out of the given span, beginning at 'start'.
+ /// </summary>
+ /// <param name="start">The index at which to begin this slice.</param>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> index is not in range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public Span<T> Slice(int start)
+ {
+ if ((uint)start > (uint)_length)
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ return new Span<T>(ref Unsafe.Add(ref _pointer.Value, start), _length - start);
+ }
+
+ /// <summary>
+ /// Forms a slice out of the given span, beginning at 'start', of given length
+ /// </summary>
+ /// <param name="start">The index at which to begin this slice.</param>
+ /// <param name="length">The desired length for the slice (exclusive).</param>
+ /// <exception cref="System.ArgumentOutOfRangeException">
+ /// Thrown when the specified <paramref name="start"/> or end index is not in range (<0 or >=Length).
+ /// </exception>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public Span<T> Slice(int start, int length)
+ {
+ if ((uint)start > (uint)_length || (uint)length > (uint)(_length - start))
+ ThrowHelper.ThrowArgumentOutOfRangeException();
+
+ return new Span<T>(ref Unsafe.Add(ref _pointer.Value, start), length);
+ }
+
+ /// <summary>
+ /// Copies the contents of this span into a new array. This heap
+ /// allocates, so should generally be avoided, however it is sometimes
+ /// necessary to bridge the gap with APIs written in terms of arrays.
+ /// </summary>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public T[] ToArray()
+ {
+ if (_length == 0)
+ return Array.Empty<T>();
+
+ var destination = new T[_length];
+ Buffer.Memmove(ref Unsafe.As<byte, T>(ref destination.GetRawSzArrayData()), ref _pointer.Value, (nuint)_length);
+ return destination;
+ }
+ }
+}
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
+#if !FEATURE_PORTABLE_SPAN
using System.Runtime.Versioning;
-using Internal.Runtime.CompilerServices;
+#endif // !FEATURE_PORTABLE_SPAN
#pragma warning disable 0809 //warning CS0809: Obsolete member 'Span<T>.Equals(object)' overrides non-obsolete member 'object.Equals(object)'
-#if BIT64
-using nuint = System.UInt64;
-#else
-using nuint = System.UInt32;
-#endif
-
namespace System
{
/// <summary>
/// </summary>
[DebuggerTypeProxy(typeof(SpanDebugView<>))]
[DebuggerDisplay("{DebuggerDisplay,nq}")]
- [NonVersionable]
- public readonly ref struct Span<T>
+ public readonly ref partial struct Span<T>
{
- /// <summary>A byref or a native ptr.</summary>
- internal readonly ByReference<T> _pointer;
- /// <summary>The number of elements this Span contains.</summary>
-#if PROJECTN
- [Bound]
-#endif
- private readonly int _length;
-
- /// <summary>
- /// Creates a new span over the entirety of the target array.
- /// </summary>
- /// <param name="array">The target array.</param>
- /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
- /// reference (Nothing in Visual Basic).</exception>
- /// <exception cref="System.ArrayTypeMismatchException">Thrown when <paramref name="array"/> is covariant and array's type is not exactly T[].</exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public Span(T[] array)
- {
- if (array == null)
- ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
- if (default(T) == null && array.GetType() != typeof(T[]))
- ThrowHelper.ThrowArrayTypeMismatchException();
-
- _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()));
- _length = array.Length;
- }
-
- /// <summary>
- /// Creates a new span over the portion of the target array beginning
- /// at 'start' index and ending at 'end' index (exclusive).
- /// </summary>
- /// <param name="array">The target array.</param>
- /// <param name="start">The index at which to begin the span.</param>
- /// <param name="length">The number of items in the span.</param>
- /// <exception cref="System.ArgumentNullException">Thrown when <paramref name="array"/> is a null
- /// reference (Nothing in Visual Basic).</exception>
- /// <exception cref="System.ArrayTypeMismatchException">Thrown when <paramref name="array"/> is covariant and array's type is not exactly T[].</exception>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> or end index is not in the range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public Span(T[] array, int start, int length)
- {
- if (array == null)
- ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
- if (default(T) == null && array.GetType() != typeof(T[]))
- ThrowHelper.ThrowArrayTypeMismatchException();
- if ((uint)start > (uint)array.Length || (uint)length > (uint)(array.Length - start))
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- _pointer = new ByReference<T>(ref Unsafe.Add(ref Unsafe.As<byte, T>(ref array.GetRawSzArrayData()), start));
- _length = length;
- }
-
- /// <summary>
- /// Creates a new span over the target unmanaged buffer. Clearly this
- /// is quite dangerous, because we are creating arbitrarily typed T's
- /// out of a void*-typed block of memory. And the length is not checked.
- /// But if this creation is correct, then all subsequent uses are correct.
- /// </summary>
- /// <param name="pointer">An unmanaged pointer to memory.</param>
- /// <param name="length">The number of <typeparamref name="T"/> elements the memory contains.</param>
- /// <exception cref="System.ArgumentException">
- /// Thrown when <typeparamref name="T"/> is reference type or contains pointers and hence cannot be stored in unmanaged memory.
- /// </exception>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="length"/> is negative.
- /// </exception>
- [CLSCompliant(false)]
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public unsafe Span(void* pointer, int length)
- {
- if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
- ThrowHelper.ThrowInvalidTypeWithPointersNotSupported(typeof(T));
- if (length < 0)
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- _pointer = new ByReference<T>(ref Unsafe.As<byte, T>(ref *(byte*)pointer));
- _length = length;
- }
-
- // Constructor for internal use only.
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- internal Span(ref T ptr, int length)
- {
- Debug.Assert(length >= 0);
-
- _pointer = new ByReference<T>(ref ptr);
- _length = length;
- }
-
/// <summary>
/// The number of items in the span.
/// </summary>
public int Length
{
+#if !FEATURE_PORTABLE_SPAN
[NonVersionable]
- get
- {
- return _length;
- }
- }
+#endif // !FEATURE_PORTABLE_SPAN
+ get
+ {
+ return _length;
+ }
+ }
/// <summary>
/// Returns true if Length is 0.
/// </summary>
public bool IsEmpty
{
+#if !FEATURE_PORTABLE_SPAN
[NonVersionable]
+#endif // !FEATURE_PORTABLE_SPAN
get
{
return _length == 0;
}
/// <summary>
- /// Returns a reference to specified element of the Span.
- /// </summary>
- /// <param name="index"></param>
- /// <returns></returns>
- /// <exception cref="System.IndexOutOfRangeException">
- /// Thrown when index less than 0 or index greater than or equal to Length
- /// </exception>
- public ref T this[int index]
- {
-#if PROJECTN
- [BoundsChecking]
- get
- {
- return ref Unsafe.Add(ref _pointer.Value, index);
- }
-#else
- [Intrinsic]
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- [NonVersionable]
- get
- {
- if ((uint)index >= (uint)_length)
- ThrowHelper.ThrowIndexOutOfRangeException();
- return ref Unsafe.Add(ref _pointer.Value, index);
- }
-#endif
- }
-
- /// <summary>
- /// Clears the contents of this span.
- /// </summary>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public void Clear()
- {
- if (RuntimeHelpers.IsReferenceOrContainsReferences<T>())
- {
- Span.ClearWithReferences(ref Unsafe.As<T, IntPtr>(ref _pointer.Value), (nuint)_length * (nuint)(Unsafe.SizeOf<T>() / sizeof(nuint)));
- }
- else
- {
- Span.ClearWithoutReferences(ref Unsafe.As<T, byte>(ref _pointer.Value), (nuint)_length * (nuint)Unsafe.SizeOf<T>());
- }
- }
-
- /// <summary>
- /// Fills the contents of this span with the given value.
- /// </summary>
- public void Fill(T value)
- {
- if (Unsafe.SizeOf<T>() == 1)
- {
- uint length = (uint)_length;
- if (length == 0)
- return;
-
- T tmp = value; // Avoid taking address of the "value" argument. It would regress performance of the loop below.
- Unsafe.InitBlockUnaligned(ref Unsafe.As<T, byte>(ref _pointer.Value), Unsafe.As<T, byte>(ref tmp), length);
- }
- else
- {
- // Do all math as nuint to avoid unnecessary 64->32->64 bit integer truncations
- nuint length = (uint)_length;
- if (length == 0)
- return;
-
- ref T r = ref _pointer.Value;
-
- // TODO: Create block fill for value types of power of two sizes e.g. 2,4,8,16
-
- nuint elementSize = (uint)Unsafe.SizeOf<T>();
- nuint i = 0;
- for (; i < (length & ~(nuint)7); i += 8)
- {
- Unsafe.AddByteOffset<T>(ref r, (i + 0) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 1) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 2) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 3) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 4) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 5) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 6) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 7) * elementSize) = value;
- }
- if (i < (length & ~(nuint)3))
- {
- Unsafe.AddByteOffset<T>(ref r, (i + 0) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 1) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 2) * elementSize) = value;
- Unsafe.AddByteOffset<T>(ref r, (i + 3) * elementSize) = value;
- i += 4;
- }
- for (; i < length; i++)
- {
- Unsafe.AddByteOffset<T>(ref r, i * elementSize) = value;
- }
- }
- }
-
- /// <summary>
- /// Copies the contents of this span into destination span. If the source
- /// and destinations overlap, this method behaves as if the original values in
- /// a temporary location before the destination is overwritten.
- /// </summary>
- /// <param name="destination">The span to copy items into.</param>
- /// <exception cref="System.ArgumentException">
- /// Thrown when the destination Span is shorter than the source Span.
- /// </exception>
- public void CopyTo(Span<T> destination)
- {
- // Using "if (!TryCopyTo(...))" results in two branches: one for the length
- // check, and one for the result of TryCopyTo. Since these checks are equivalent,
- // we can optimize by performing the check once ourselves then calling Memmove directly.
-
- if ((uint)_length <= (uint)destination.Length)
- {
- Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
- }
- else
- {
- ThrowHelper.ThrowArgumentException_DestinationTooShort();
- }
- }
-
- /// <summary>
- /// Copies the contents of this span into destination span. If the source
- /// and destinations overlap, this method behaves as if the original values in
- /// a temporary location before the destination is overwritten.
- /// </summary>
- /// <param name="destination">The span to copy items into.</param>
- /// <returns>If the destination span is shorter than the source span, this method
- /// return false and no data is written to the destination.</returns>
- public bool TryCopyTo(Span<T> destination)
- {
- bool retVal = false;
- if ((uint)_length <= (uint)destination.Length)
- {
- Buffer.Memmove(ref destination._pointer.Value, ref _pointer.Value, (nuint)_length);
- retVal = true;
- }
- return retVal;
- }
-
- /// <summary>
- /// Returns true if left and right point at the same memory and have the same length. Note that
- /// this does *not* check to see if the *contents* are equal.
- /// </summary>
- public static bool operator ==(Span<T> left, Span<T> right)
- {
- return left._length == right._length && Unsafe.AreSame<T>(ref left._pointer.Value, ref right._pointer.Value);
- }
-
- /// <summary>
/// Returns false if left and right point at the same memory and have the same length. Note that
/// this does *not* check to see if the *contents* are equal.
/// </summary>
}
/// <summary>
- /// For <see cref="Span{Char}"/>, returns a new instance of string that represents the characters pointed to by the span.
- /// Otherwise, returns a <see cref="String"/> with the name of the type and the number of elements.
- /// </summary>
- public override string ToString()
- {
- if (typeof(T) == typeof(char))
- {
- unsafe
- {
- fixed (char* src = &Unsafe.As<T, char>(ref _pointer.Value))
- return new string(src, 0, _length);
- }
- }
- return string.Format("System.Span<{0}>[{1}]", typeof(T).Name, _length);
- }
-
- /// <summary>
/// Defines an implicit conversion of an array to a <see cref="Span{T}"/>
/// </summary>
public static implicit operator Span<T>(T[] array) => array != null ? new Span<T>(array) : default;
=> arraySegment.Array != null ? new Span<T>(arraySegment.Array, arraySegment.Offset, arraySegment.Count) : default;
/// <summary>
- /// Defines an implicit conversion of a <see cref="Span{T}"/> to a <see cref="ReadOnlySpan{T}"/>
- /// </summary>
- public static implicit operator ReadOnlySpan<T>(Span<T> span) => new ReadOnlySpan<T>(ref span._pointer.Value, span._length);
-
- /// <summary>
- /// Forms a slice out of the given span, beginning at 'start'.
- /// </summary>
- /// <param name="start">The index at which to begin this slice.</param>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> index is not in range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public Span<T> Slice(int start)
- {
- if ((uint)start > (uint)_length)
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- return new Span<T>(ref Unsafe.Add(ref _pointer.Value, start), _length - start);
- }
-
- /// <summary>
- /// Forms a slice out of the given span, beginning at 'start', of given length
- /// </summary>
- /// <param name="start">The index at which to begin this slice.</param>
- /// <param name="length">The desired length for the slice (exclusive).</param>
- /// <exception cref="System.ArgumentOutOfRangeException">
- /// Thrown when the specified <paramref name="start"/> or end index is not in range (<0 or >=Length).
- /// </exception>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public Span<T> Slice(int start, int length)
- {
- if ((uint)start > (uint)_length || (uint)length > (uint)(_length - start))
- ThrowHelper.ThrowArgumentOutOfRangeException();
-
- return new Span<T>(ref Unsafe.Add(ref _pointer.Value, start), length);
- }
-
- /// <summary>
- /// Copies the contents of this span into a new array. This heap
- /// allocates, so should generally be avoided, however it is sometimes
- /// necessary to bridge the gap with APIs written in terms of arrays.
- /// </summary>
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public T[] ToArray()
- {
- if (_length == 0)
- return Array.Empty<T>();
-
- var destination = new T[_length];
- Buffer.Memmove(ref Unsafe.As<byte, T>(ref destination.GetRawSzArrayData()), ref _pointer.Value, (nuint)_length);
- return destination;
- }
-
- // <summary>
/// Returns an empty <see cref="Span{T}"/>
/// </summary>
public static Span<T> Empty => default(Span<T>);
projects / platform / upstream / coreclr.git / commitdiff