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
};
-// { 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;
-}
-// { 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 "" }
-// { 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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