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functional (_Mem_fn): Constrain function call operators to avoid ambiguities. 

* include/std/functional (_Mem_fn): Constrain function call operators
	to avoid ambiguities. Use perfect forwarding.
	* testsuite/20_util/function_objects/mem_fn/55463.cc: Additional
	tests.
	* testsuite/20_util/function_objects/mem_fn/forward.cc: New.
	* testsuite/20_util/bind/ref_neg.cc: Adjust dg-error line numbers.

From-SVN: r193879
This commit is contained in:
Jonathan Wakely 2012-11-28 01:42:25 +00:00 committed by Jonathan Wakely
parent 69bccd4a33
commit b1c2b51b66
5 changed files with 330 additions and 104 deletions
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9
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,12 @@
2012-11-28 Jonathan Wakely <jwakely.gcc@gmail.com>
* include/std/functional (_Mem_fn): Constrain function call operators
to avoid ambiguities. Use perfect forwarding.
* testsuite/20_util/function_objects/mem_fn/55463.cc: Additional
tests.
* testsuite/20_util/function_objects/mem_fn/forward.cc: New.
* testsuite/20_util/bind/ref_neg.cc: Adjust dg-error line numbers.
2012-11-27 Ollie Wild <aaw@google.com> 2012-11-27 Ollie Wild <aaw@google.com>
* include/bits/stl_tree.h (@headername): Fix incorrect Doxygen macro * include/bits/stl_tree.h (@headername): Fix incorrect Doxygen macro

313
libstdc++-v3/include/std/functional
View File

@ -501,6 +501,26 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
// @} group functors // @} group functors
template<typename... _Cond>
using _Require = typename enable_if<__and_<_Cond...>::value>::type;
template<typename... _Types>
struct _Pack : integral_constant<size_t, sizeof...(_Types)>
{ };
template<typename _From, typename _To, bool = _From::value == _To::value>
struct _AllConvertible : false_type
{ };
template<typename... _From, typename... _To>
struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true>
: __and_<is_convertible<_From, _To>...>
{ };
template<typename _Tp1, typename _Tp2>
using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type,
typename std::decay<_Tp2>::type>>;
/** /**
* Derives from @c unary_function or @c binary_function, or perhaps * Derives from @c unary_function or @c binary_function, or perhaps
* nothing, depending on the number of arguments provided. The * nothing, depending on the number of arguments provided. The
@ -526,19 +546,38 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
{ {
typedef _Res (_Class::*_Functor)(_ArgTypes...); typedef _Res (_Class::*_Functor)(_ArgTypes...);
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __object, const volatile _Class *, _M_call(_Tp&& __object, const volatile _Class *,
_ArgTypes... __args) const _Args&&... __args) const
{ {
return (std::forward<_Tp>(__object).*__pmf) return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_ArgTypes>(__args)...); (std::forward<_Args>(__args)...);
} }
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __ptr, const volatile void *, _ArgTypes... __args) const _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
// Require each _Args to be convertible to corresponding _ArgTypes
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is not _Class, _Class& or _Class*
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is _Class or derived from _Class
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public: public:
typedef _Res result_type; typedef _Res result_type;
@ -546,28 +585,39 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects // Handle objects
_Res template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
operator()(_Class& __object, _ArgTypes... __args) const
{ return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle pointers
_Res
operator()(_Class* __object, _ArgTypes... __args) const
{ return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res _Res
operator()(_Tp&& __object, _ArgTypes... __args) const operator()(_Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(_Class&& __object, _Args&&... __args) const
{ {
return _M_call(std::forward<_Tp>(__object), &__object, return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
std::forward<_ArgTypes>(__args)...);
} }
template<typename _Tp> // Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(reference_wrapper<_Tp> __ref, _ArgTypes... __args) const operator()(_Class* __object, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_ArgTypes>(__args)...); } { return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private: private:
_Functor __pmf; _Functor __pmf;
@ -581,19 +631,33 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
{ {
typedef _Res (_Class::*_Functor)(_ArgTypes...) const; typedef _Res (_Class::*_Functor)(_ArgTypes...) const;
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __object, const volatile _Class *, _M_call(_Tp&& __object, const volatile _Class *,
_ArgTypes... __args) const _Args&&... __args) const
{ {
return (std::forward<_Tp>(__object).*__pmf) return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_ArgTypes>(__args)...); (std::forward<_Args>(__args)...);
} }
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __ptr, const volatile void *, _ArgTypes... __args) const _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public: public:
typedef _Res result_type; typedef _Res result_type;
@ -601,27 +665,38 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects // Handle objects
_Res template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
operator()(const _Class& __object, _ArgTypes... __args) const _Res
{ return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } operator()(const _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
// Handle pointers template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(const _Class* __object, _ArgTypes... __args) const operator()(const _Class&& __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res operator()(_Tp&& __object, _ArgTypes... __args) const
{ {
return _M_call(std::forward<_Tp>(__object), &__object, return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
std::forward<_ArgTypes>(__args)...);
} }
template<typename _Tp> // Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(reference_wrapper<_Tp> __ref, _ArgTypes... __args) const operator()(const _Class* __object, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_ArgTypes>(__args)...); } { return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private: private:
_Functor __pmf; _Functor __pmf;
@ -635,19 +710,33 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
{ {
typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile; typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __object, const volatile _Class *, _M_call(_Tp&& __object, const volatile _Class *,
_ArgTypes... __args) const _Args&&... __args) const
{ {
return (std::forward<_Tp>(__object).*__pmf) return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_ArgTypes>(__args)...); (std::forward<_Args>(__args)...);
} }
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __ptr, const volatile void *, _ArgTypes... __args) const _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public: public:
typedef _Res result_type; typedef _Res result_type;
@ -655,28 +744,39 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects // Handle objects
_Res template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
operator()(volatile _Class& __object, _ArgTypes... __args) const
{ return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle pointers
_Res
operator()(volatile _Class* __object, _ArgTypes... __args) const
{ return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res _Res
operator()(_Tp&& __object, _ArgTypes... __args) const operator()(volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res
operator()(volatile _Class&& __object, _Args&&... __args) const
{ {
return _M_call(std::forward<_Tp>(__object), &__object, return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
std::forward<_ArgTypes>(__args)...);
} }
template<typename _Tp> // Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(reference_wrapper<_Tp> __ref, _ArgTypes... __args) const operator()(volatile _Class* __object, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_ArgTypes>(__args)...); } { return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private: private:
_Functor __pmf; _Functor __pmf;
@ -690,19 +790,33 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
{ {
typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile; typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __object, const volatile _Class *, _M_call(_Tp&& __object, const volatile _Class *,
_ArgTypes... __args) const _Args&&... __args) const
{ {
return (std::forward<_Tp>(__object).*__pmf) return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_ArgTypes>(__args)...); (std::forward<_Args>(__args)...);
} }
template<typename _Tp> template<typename _Tp, typename... _Args>
_Res _Res
_M_call(_Tp&& __ptr, const volatile void *, _ArgTypes... __args) const _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_ArgTypes>(__args)...); } { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template<typename... _Args>
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template<typename _Tp, typename... _Args>
using _RequireValidArgs3
= _Require<is_base_of<_Class, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public: public:
typedef _Res result_type; typedef _Res result_type;
@ -710,27 +824,38 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects // Handle objects
_Res template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
operator()(const volatile _Class& __object, _ArgTypes... __args) const _Res
{ return (__object.*__pmf)(std::forward<_ArgTypes>(__args)...); } operator()(const volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
// Handle pointers template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(const volatile _Class* __object, _ArgTypes... __args) const operator()(const volatile _Class&& __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_ArgTypes>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res operator()(_Tp&& __object, _ArgTypes... __args) const
{ {
return _M_call(std::forward<_Tp>(__object), &__object, return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
std::forward<_ArgTypes>(__args)...);
} }
template<typename _Tp> // Handle pointers
template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>
_Res _Res
operator()(reference_wrapper<_Tp> __ref, _ArgTypes... __args) const operator()(const volatile _Class* __object, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_ArgTypes>(__args)...); } { return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs2<_Tp, _Args...>>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template<typename _Tp, typename... _Args,
typename _Req = _RequireValidArgs3<_Tp, _Args...>>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private: private:
_Functor __pmf; _Functor __pmf;
@ -756,7 +881,7 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
// This bit of genius is due to Peter Dimov, improved slightly by // This bit of genius is due to Peter Dimov, improved slightly by
// Douglas Gregor. // Douglas Gregor.
// Made less elegant by Jonathan Wakely to support perfect forwarding. // Made less elegant to support perfect forwarding and noexcept.
template<typename _Tp> template<typename _Tp>
auto auto
_M_call(_Tp&& __object, const _Class *) const noexcept _M_call(_Tp&& __object, const _Class *) const noexcept
@ -807,7 +932,7 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
{ return __object->*__pm; } { return __object->*__pm; }
// Handle smart pointers and derived // Handle smart pointers and derived
template<typename _Tp> template<typename _Tp, typename _Req = _Require<_NotSame<_Class*, _Tp>>>
auto auto
operator()(_Tp&& __unknown) const operator()(_Tp&& __unknown) const
noexcept(noexcept(std::declval<_Mem_fn*>()->_M_call noexcept(noexcept(std::declval<_Mem_fn*>()->_M_call
@ -815,12 +940,12 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
-> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown)) -> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown))
{ return _M_call(std::forward<_Tp>(__unknown), &__unknown); } { return _M_call(std::forward<_Tp>(__unknown), &__unknown); }
template<typename _Tp> template<typename _Tp, typename _Req = _Require<is_base_of<_Class, _Tp>>>
auto auto
operator()(reference_wrapper<_Tp> __ref) const operator()(reference_wrapper<_Tp> __ref) const
noexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get()))) noexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get())))
-> decltype((*this)(__ref.get())) -> decltype((*this)(__ref.get()))
{ return operator()(__ref.get()); } { return (*this)(__ref.get()); }
private: private:
_Res _Class::*__pm; _Res _Class::*__pm;

8
libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
View File

@ -30,10 +30,10 @@ void test01()
{ {
const int dummy = 0; const int dummy = 0;
std::bind(&inc, _1)(0); // { dg-error "no match" } std::bind(&inc, _1)(0); // { dg-error "no match" }
// { dg-error "rvalue|const" "" { target *-*-* } 1224 } // { dg-error "rvalue|const" "" { target *-*-* } 1349 }
// { dg-error "rvalue|const" "" { target *-*-* } 1238 } // { dg-error "rvalue|const" "" { target *-*-* } 1363 }
// { dg-error "rvalue|const" "" { target *-*-* } 1252 } // { dg-error "rvalue|const" "" { target *-*-* } 1377 }
// { dg-error "rvalue|const" "" { target *-*-* } 1266 } // { dg-error "rvalue|const" "" { target *-*-* } 1391 }
std::bind(&inc, std::ref(dummy))(); // { dg-error "no match" } std::bind(&inc, std::ref(dummy))(); // { dg-error "no match" }
} }

42
libstdc++-v3/testsuite/20_util/function_objects/mem_fn/55463.cc
View File

@ -32,7 +32,12 @@ struct X
int data; int data;
}; };
struct Y : X { };
using CX = const X; using CX = const X;
using CY = const Y;
using X_ptr = X*;
struct smart_ptr struct smart_ptr
{ {
@ -41,38 +46,63 @@ struct smart_ptr
std::reference_wrapper<X> ref(); std::reference_wrapper<X> ref();
std::reference_wrapper<const X> cref(); std::reference_wrapper<const X> cref();
std::reference_wrapper<Y> yref();
void test01() void test01()
{ {
int& i1 = std::mem_fn( &X::func )( X() ); int& i1 = std::mem_fn( &X::func )( X() );
int& i2 = std::mem_fn( &X::func )( smart_ptr() ); int& i2 = std::mem_fn( &X::func )( Y() );
int& i3 = std::mem_fn( &X::func )( ref() ); int& i3 = std::mem_fn( &X::func )( ref() );
int& i4 = std::mem_fn( &X::func )( yref() );
int& i5 = std::mem_fn( &X::func )( X_ptr() );
int& i6 = std::mem_fn( &X::func )( smart_ptr() );
char& c1 = std::mem_fn( &X::func_c )( X() ); char& c1 = std::mem_fn( &X::func_c )( X() );
char& c2 = std::mem_fn( &X::func_c )( CX() ); char& c2 = std::mem_fn( &X::func_c )( CX() );
char& c3 = std::mem_fn( &X::func_c )( smart_ptr() ); char& c3 = std::mem_fn( &X::func_c )( Y() );
char& c4 = std::mem_fn( &X::func_c )( ref() ); char& c4 = std::mem_fn( &X::func_c )( ref() );
char& c5 = std::mem_fn( &X::func_c )( cref() ); char& c5 = std::mem_fn( &X::func_c )( cref() );
char& c6 = std::mem_fn( &X::func_c )( yref() );
char& c7 = std::mem_fn( &X::func_c )( X_ptr() );
char& c8 = std::mem_fn( &X::func_c )( smart_ptr() );
short& s1 = std::mem_fn( &X::func_v )( X() ); short& s1 = std::mem_fn( &X::func_v )( X() );
short& s2 = std::mem_fn( &X::func_v )( smart_ptr() ); short& s2 = std::mem_fn( &X::func_v )( Y() );
short& s3 = std::mem_fn( &X::func_v )( ref() ); short& s3 = std::mem_fn( &X::func_v )( ref() );
short& s4 = std::mem_fn( &X::func_v )( yref() );
short& s5 = std::mem_fn( &X::func_v )( X_ptr() );
short& s6 = std::mem_fn( &X::func_v )( smart_ptr() );
double& d1 = std::mem_fn( &X::func_cv )( X() ); double& d1 = std::mem_fn( &X::func_cv )( X() );
double& d2 = std::mem_fn( &X::func_cv )( CX() ); double& d2 = std::mem_fn( &X::func_cv )( CX() );
double& d3 = std::mem_fn( &X::func_cv )( smart_ptr() ); double& d3 = std::mem_fn( &X::func_cv )( Y() );
double& d4 = std::mem_fn( &X::func_cv )( ref() ); double& d4 = std::mem_fn( &X::func_cv )( ref() );
double& d5 = std::mem_fn( &X::func_cv )( cref() ); double& d5 = std::mem_fn( &X::func_cv )( cref() );
double& d6 = std::mem_fn( &X::func_cv )( yref() );
double& d7 = std::mem_fn( &X::func_cv )( X_ptr() );
double& d8 = std::mem_fn( &X::func_cv )( smart_ptr() );
// [expr.mptr.oper] // [expr.mptr.oper]
// The result of a .* expression whose second operand is a pointer to a // The result of a .* expression whose second operand is a pointer to a
// data member is of the same value category (3.10) as its first operand. // data member is of the same value category (3.10) as its first operand.
int&& rval = std::mem_fn( &X::data )( X() ); int&& rval = std::mem_fn( &X::data )( X() );
const int&& crval = std::mem_fn( &X::data )( CX() ); const int&& crval = std::mem_fn( &X::data )( CX() );
int&& yrval = std::mem_fn( &X::data )( Y() );
int& sval = std::mem_fn( &X::data )( smart_ptr() ); const int&& ycrval = std::mem_fn( &X::data )( CY() );
int& val = std::mem_fn( &X::data )( ref() ); int& val = std::mem_fn( &X::data )( ref() );
const int& cval = std::mem_fn( &X::data )( cref() ); const int& cval = std::mem_fn( &X::data )( cref() );
int& yval = std::mem_fn( &X::data )( yref() );
int& pval = std::mem_fn( &X::data )( X_ptr() );
int& sval = std::mem_fn( &X::data )( smart_ptr() );
} }
void test02()
{
std::reference_wrapper<X> r = ref();
X& x1 = std::mem_fn( &std::reference_wrapper<X>::get )( r );
const std::reference_wrapper<X> cr = ref();
const X& x3 = std::mem_fn( &std::reference_wrapper<X>::get )( cr );
X& x2 = std::mem_fn( &std::reference_wrapper<X>::get )( ref() );
}

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// { dg-options "-std=gnu++11" }
// Copyright (C) 2012 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 3, 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 COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include <functional>
#include <testsuite_hooks.h>
struct Counter
{
Counter() = default;
Counter(const Counter&) { ++count; }
static int count;
};
int Counter::count = 0;
struct X
{
int func(Counter, int i) { return i; }
char func_c(Counter, char c) const { return c; }
short func_v(Counter, short s) volatile { return s; }
double func_cv(Counter, double d) const volatile { return d; }
};
void test01()
{
Counter c;
X x;
std::mem_fn( &X::func )( x, c, 0 );
VERIFY( Counter::count == 1 );
std::mem_fn( &X::func_c )( x, c, 0 );
VERIFY( Counter::count == 2 );
std::mem_fn( &X::func_v )( x, c, 0 );
VERIFY( Counter::count == 3 );
std::mem_fn( &X::func_cv )( x, c, 0 );
VERIFY( Counter::count == 4 );
}
int main()
{
test01();
}