template<typename _Signature>
class result_of;
+#ifdef _GLIBCXX_INCLUDE_AS_TR1
/**
* Actual implementation of result_of. When _Has_result_type is
* true, gets its result from _Weak_result_type. Otherwise, uses
typedef void type;
};
+#else
+ /**
+ * Actual implementation of std::result_of.
+ */
+ template<bool _Is_mem_obj_ptr, bool _Is_mem_fun_ptr, typename _Signature>
+ struct _Result_of_impl;
+
+ // Helper functions used by _Result_of_impl.
+ template<typename _ArgT>
+ struct _Result_of_arg
+ {
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#904
+#if 0
+ static typename conditional<is_reference<_ArgT>::value,
+ typename add_lvalue_reference<_ArgT>::type,
+ typename add_rvalue_reference<_ArgT>::type>::type
+ _S_fwd();
+#else
+ static typename add_rvalue_reference<_ArgT>::type
+ _S_fwd();
+#endif
+ };
+
+ template<typename _Tp, bool _NoDeref>
+ struct _Result_of_lhs
+ {
+ static _Tp _S_fwd();
+ };
+ template<typename _Tp>
+ struct _Result_of_lhs<_Tp, false>
+ {
+ static decltype( *_Result_of_lhs<_Tp,true>::_S_fwd() ) _S_fwd();
+ };
+
+ // Handle member data pointers.
+ template<typename _Res, typename _Class, typename _T1>
+ class _Result_of_impl<true, false, _Res _Class::* (_T1)>
+ {
+ typedef typename remove_reference<_T1>::type _T2;
+ typedef _Result_of_lhs<_T1, is_base_of<_Class, _T2>::value> _Fwd_lhs;
+ typedef _Res _Class::*_MemPtr;
+
+ public:
+ typedef decltype( (_Fwd_lhs::_S_fwd().*(_MemPtr())) ) type;
+ };
+
+ // Handle member function pointers.
+ template<typename _MemFun, typename _T1, typename... _ArgTypes>
+ class _Result_of_impl<false, true, _MemFun (_T1, _ArgTypes...)>
+ {
+ template<typename>
+ struct _Get_class;
+
+ template<typename _Res, typename _Class, typename... _Args>
+ struct _Get_class<_Res (_Class::*)(_Args...)>
+ { typedef _Class type; };
+ template<typename _Res, typename _Class, typename... _Args>
+ struct _Get_class<_Res (_Class::*)(_Args...) const>
+ { typedef _Class type; };
+ template<typename _Res, typename _Class, typename... _Args>
+ struct _Get_class<_Res (_Class::*)(_Args...) volatile>
+ { typedef _Class type; };
+ template<typename _Res, typename _Class, typename... _Args>
+ struct _Get_class<_Res (_Class::*)(_Args...) const volatile>
+ { typedef _Class type; };
+
+ typedef typename _Get_class<_MemFun>::type _Class;
+ typedef typename remove_reference<_T1>::type _T2;
+ typedef _Result_of_lhs<_T1, is_base_of<_Class, _T2>::value> _Fwd_lhs;
+
+ public:
+ typedef decltype( (_Fwd_lhs::_S_fwd().*(_MemFun())) (
+ _Result_of_arg<_ArgTypes>::_S_fwd() ... ) ) type;
+ };
+
+ // Handle other callable types.
+ template<typename _Functor, typename... _ArgTypes>
+ class _Result_of_impl<false, false, _Functor(_ArgTypes...)>
+ {
+ // get an example of the callable type
+ static typename add_rvalue_reference<_Functor>::type
+ _S_fwd_functor();
+
+ public:
+ typedef decltype( _Result_of_impl::_S_fwd_functor() (
+ _Result_of_arg<_ArgTypes>::_S_fwd() ... ) ) type;
+ };
+
+ template<typename _Functor, typename... _ArgTypes>
+ class result_of<_Functor(_ArgTypes...)>
+ : public _Result_of_impl<
+ is_member_object_pointer<_Functor>::value,
+ is_member_function_pointer<_Functor>::value,
+ _Functor(_ArgTypes...)>
+ {
+ };
+#endif
+
/// Determines if the type _Tp derives from unary_function.
template<typename _Tp>
struct _Derives_from_unary_function : __sfinae_types
typedef _Tp* type;
};
+#ifdef _GLIBCXX_INCLUDE_AS_TR1
/**
* Invoke a function object, which may be either a member pointer or a
* function object. The first parameter will tell which.
{
return __f(__args...);
}
+#else
+ /**
+ * Invoke a function object, which may be either a member pointer or a
+ * function object. The first parameter will tell which.
+ */
+ template<typename _Functor, typename... _Args>
+ inline
+ typename enable_if<
+ (!is_member_pointer<_Functor>::value
+ && !is_function<_Functor>::value
+ && !is_function<typename remove_pointer<_Functor>::type>::value),
+ typename result_of<_Functor(_Args...)>::type
+ >::type
+ __invoke(_Functor& __f, _Args&&... __args)
+ {
+ return __f(std::forward<_Args>(__args)...);
+ }
+
+ template<typename _Functor, typename... _Args>
+ inline
+ typename enable_if<
+ (is_member_pointer<_Functor>::value
+ && !is_function<_Functor>::value
+ && !is_function<typename remove_pointer<_Functor>::type>::value),
+ typename result_of<_Functor(_Args...)>::type
+ >::type
+ __invoke(_Functor& __f, _Args&&... __args)
+ {
+ return mem_fn(__f)(std::forward<_Args>(__args)...);
+ }
+
+ // To pick up function references (that will become function pointers)
+ template<typename _Functor, typename... _Args>
+ inline
+ typename enable_if<
+ (is_pointer<_Functor>::value
+ && is_function<typename remove_pointer<_Functor>::type>::value),
+ typename result_of<_Functor(_Args...)>::type
+ >::type
+ __invoke(_Functor __f, _Args&&... __args)
+ {
+ return __f(std::forward<_Args>(__args)...);
+ }
+#endif
/**
* Knowing which of unary_function and binary_function _Tp derives
public:
typedef _Tp type;
+#ifdef _GLIBCXX_INCLUDE_AS_TR1
explicit
reference_wrapper(_Tp& __indata): _M_data(&__indata)
{ }
+#else
+ reference_wrapper(_Tp& __indata): _M_data(&__indata)
+ { }
+
+ explicit
+ reference_wrapper(_Tp&&) = delete;
+#endif
reference_wrapper(const reference_wrapper<_Tp>& __inref):
_M_data(__inref._M_data)
get() const
{ return *_M_data; }
+#ifdef _GLIBCXX_INCLUDE_AS_TR1
template<typename... _Args>
typename result_of<_M_func_type(_Args...)>::type
operator()(_Args&... __args) const
{
return __invoke(get(), __args...);
}
+#else
+ template<typename... _Args>
+ typename result_of<_M_func_type(_Args...)>::type
+ operator()(_Args&&... __args) const
+ {
+ return __invoke(get(), std::forward<_Args>(__args)...);
+ }
+#endif
};
--- /dev/null
+// { dg-options "-std=gnu++0x" }
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.6.4 function object return types [func.ret]
+#include <functional>
+#include <testsuite_hooks.h>
+
+struct nested_result_type
+{
+ typedef float result_type;
+ int operator()();
+};
+
+struct nested_result_template
+{
+ template<typename F> struct result { typedef float type; };
+ int operator()(int);
+};
+
+struct cv_overload
+{
+ int operator()(int);
+ char operator()(char) const;
+ float operator()(float) volatile;
+};
+
+struct default_args
+{
+ int operator()(int* = 0, int* = 0);
+ void operator()(void*);
+};
+
+class X {};
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ using std::result_of;
+ using std::is_same;
+
+ typedef int (*func_ptr)(float, double);
+ typedef int (&func_ref)(float, double);
+
+ VERIFY((is_same<result_of<nested_result_type()>::type, int>::value));
+ VERIFY((is_same<result_of<nested_result_template(int)>::type, int>::value));
+ VERIFY((is_same<result_of<cv_overload(int)>::type, int>::value));
+ VERIFY((is_same<result_of<const cv_overload(int)>::type, char>::value));
+ VERIFY((is_same<result_of<volatile cv_overload(int)>::type, float>::value));
+ VERIFY((is_same<result_of<default_args(int*)>::type, int>::value));
+ VERIFY((is_same<result_of<default_args(char*)>::type, void>::value));
+ VERIFY((is_same<result_of<func_ptr(char, float)>::type, int>::value));
+ VERIFY((is_same<result_of<func_ref(char, float)>::type, int>::value));
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
--- /dev/null
+// { dg-options "-std=gnu++0x" }
+// { dg-do compile }
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.6.4 function object return types [func.ret]
+#include <functional>
+#include <testsuite_hooks.h>
+
+struct X
+{
+ int i;
+ int f();
+};
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ using std::result_of;
+ using std::is_same;
+
+ typedef int X::*pm;
+ typedef int (X::*pmf)();
+ typedef int (*pf)();
+
+ result_of<pmf(X*, int)>::type test2; // { dg-error "here" }
+ // { dg-error "too many arguments to function" "" { target *-*-* } 286 }
+ result_of<pf(int)>::type test3; // { dg-error "here" }
+ // { dg-error "too many arguments to function" "" { target *-*-* } 299 }
+}
+
+// { dg-excess-errors "" }
--- /dev/null
+// { dg-options "-std=gnu++0x" }
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.6.4 function object return types [func.ret]
+#include <functional>
+#include <testsuite_hooks.h>
+
+struct X
+{
+ int operator()(int&);
+ float operator()(int&&);
+};
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ using std::result_of;
+ using std::is_same;
+
+ typedef int (*func_ptr)(int&);
+
+ VERIFY((is_same<result_of<X(int)>::type, float>::value));
+ VERIFY((is_same<result_of<X(int&)>::type, int>::value));
+ VERIFY((is_same<result_of<X(int&&)>::type, float>::value));
+ VERIFY((is_same<result_of<func_ptr(int&)>::type, int>::value));
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
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