libstdc++: Fix overconstrained std::string constructor [PR103919]

The C++17 basic_string(const T&, size_t, size_t) constructor is
overconstrained, so it can't be used for a NTBS and a temporary string
gets constructed (potentially allocating memory). There is no
corresponding constructor taking an NTBS, so no need to disambiguate
from it. Accepting an NTBS avoids the temporary (and potential
allocation) and is what the standard requires.

libstdc++-v3/ChangeLog:

	PR libstdc++/103919
	* include/bits/basic_string.h (basic_string(const T&, size_t, size_t)):
	Relax constraints on string_view parameter.
	* include/bits/cow_string.h (basic_string(const T&, size_t, size_t)):
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/103919.cc: New test.

diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h
index 463cef2..a91ba51 100644 (file)
--- a/libstdc++-v3/include/bits/basic_string.h
+++ b/libstdc++-v3/include/bits/basic_string.h
@@ -766,7 +766,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param  __n   The number of characters to copy from __t.
        *  @param  __a   Allocator to use.
        */
-      template<typename _Tp, typename = _If_sv<_Tp, void>>
+      template<typename _Tp,
+              typename = enable_if_t<is_convertible_v<const _Tp&, __sv_type>>>
        _GLIBCXX20_CONSTEXPR
        basic_string(const _Tp& __t, size_type __pos, size_type __n,
                     const _Alloc& __a = _Alloc())

diff --git a/libstdc++-v3/include/bits/cow_string.h b/libstdc++-v3/include/bits/cow_string.h
index 8d0b772..84aab2f 100644 (file)
--- a/libstdc++-v3/include/bits/cow_string.h
+++ b/libstdc++-v3/include/bits/cow_string.h
@@ -690,7 +690,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @param  __n   The number of characters to copy from __t.
        *  @param  __a   Allocator to use.
        */
-      template<typename _Tp, typename = _If_sv<_Tp, void>>
+      template<typename _Tp,
+              typename = enable_if_t<is_convertible_v<const _Tp&, __sv_type>>>
        basic_string(const _Tp& __t, size_type __pos, size_type __n,
                     const _Alloc& __a = _Alloc())
        : basic_string(_S_to_string_view(__t).substr(__pos, __n), __a) { }

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/103919.cc b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/103919.cc
new file mode 100644 (file)
index 0000000..94400e3
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/103919.cc
@@ -0,0 +1,43 @@
+// { dg-do run { target c++17 } }
+
+#include <string>
+#include <new>
+#include <cstdlib>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+std::size_t counter = 0;
+
+void* operator new(std::size_t n)
+{
+  counter += n;
+  return std::malloc(n);
+}
+
+void operator delete(void* p)
+{
+  std::free(p);
+}
+
+void operator delete(void* p, std::size_t)
+{
+  std::free(p);
+}
+
+int main()
+{
+  const char* str = "A string that is considerably longer than the SSO buffer";
+
+  // PR libstdc++/103919
+  // basic_string(const T&, size_t, size_t) constructor is overconstrained
+  counter = 0;
+  std::string s(str, 2, 6);
+  VERIFY( s == "string" );
+#if _GLIBCXX_USE_CXX11_ABI
+  // The string fits in the SSO buffer, so nothing is allocated.
+  VERIFY( counter == 0 );
+#else
+  // The COW string allocates a string rep and 7 chars.
+  VERIFY( counter < std::strlen(str) );
+#endif
+}