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type_traits (result_of): Provide "SFINAE-friendly" (see N3436) implementation. 

2012-10-01  Daniel Krugler  <daniel.kruegler@googlemail.com>

	* include/std/type_traits (result_of): Provide "SFINAE-friendly"
	(see N3436) implementation.
	* testsuite/20_util/result_of/sfinae_friendly_1.cc: New.
	* testsuite/20_util/result_of/sfinae_friendly_2.cc: Likewise.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Tweak
	dg-error line numbers.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.
	* testsuite/20_util/declval/requirements/1_neg.cc: Likewise.

From-SVN: r191930
This commit is contained in:
Daniel Krugler 2012-10-01 16:02:57 +00:00 committed by Paolo Carlini
parent cd8b6dc554
commit 83ddb39f04
7 changed files with 987 additions and 84 deletions
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12
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,15 @@
2012-10-01 Daniel Krugler <daniel.kruegler@googlemail.com>
* include/std/type_traits (result_of): Provide "SFINAE-friendly"
(see N3436) implementation.
* testsuite/20_util/result_of/sfinae_friendly_1.cc: New.
* testsuite/20_util/result_of/sfinae_friendly_2.cc: Likewise.
* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Tweak
dg-error line numbers.
* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
Likewise.
* testsuite/20_util/declval/requirements/1_neg.cc: Likewise.
2012-09-30 Benjamin Kosnik <bkoz@redhat.com>
* doc/doxygen/user.cfg.in: Update to doxygen 1.8.2.

209
libstdc++-v3/include/std/type_traits
View File

@ -1,7 +1,6 @@
// C++11 type_traits -*- C++ -*-
// Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
// Free Software Foundation, Inc.
// Copyright (C) 2007-2012 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
@ -1819,89 +1818,171 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Signature>
class result_of;
template<typename _MemPtr, typename _Arg>
struct _Result_of_memobj;
// sfinae-friendly result_of implementation. We use enable_if to transport
// both the result information (as the member type) and the failure
// information (no member type).
template<typename _Res, typename _Class, typename _Arg>
struct _Result_of_memobj<_Res _Class::*, _Arg>
template<typename _Tp>
using __success_type = enable_if<true, _Tp>;
using __failure_type = enable_if<false>;
// [func.require] paragraph 1 bullet 1:
struct __result_of_memfun_ref_impl
{
template<typename _Fp, typename _Tp1, typename... _Args>
static __success_type<decltype(
(std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
)> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun_ref
: private __result_of_memfun_ref_impl
{
private:
typedef _Res _Class::* _Func;
template<typename _Tp>
static _Tp _S_get(const _Class&);
template<typename _Tp>
static _Tp _S_get(const volatile _Class&);
template<typename _Tp>
static decltype(*std::declval<_Tp>()) _S_get(...);
public:
typedef
decltype(_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
__type;
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
};
template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
struct _Result_of_memfun;
// [func.require] paragraph 1 bullet 2:
struct __result_of_memfun_deref_impl
{
template<typename _Fp, typename _Tp1, typename... _Args>
static __success_type<decltype(
((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
)> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun_deref
: private __result_of_memfun_deref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
};
// [func.require] paragraph 1 bullet 3:
struct __result_of_memobj_ref_impl
{
template<typename _Fp, typename _Tp1>
static __success_type<decltype(
std::declval<_Tp1>().*std::declval<_Fp>()
)> _S_test(int);
template<typename, typename>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj_ref
: private __result_of_memobj_ref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
};
// [func.require] paragraph 1 bullet 4:
struct __result_of_memobj_deref_impl
{
template<typename _Fp, typename _Tp1>
static __success_type<decltype(
(*std::declval<_Tp1>()).*std::declval<_Fp>()
)> _S_test(int);
template<typename, typename>
static __failure_type _S_test(...);
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj_deref
: private __result_of_memobj_deref_impl
{
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
};
template<typename _MemPtr, typename _Arg>
struct __result_of_memobj;
template<typename _Res, typename _Class, typename _Arg>
struct __result_of_memobj<_Res _Class::*, _Arg>
{
typedef typename remove_cv<typename remove_reference<
_Arg>::type>::type _Argval;
typedef _Res _Class::* _MemPtr;
typedef typename conditional<__or_<is_same<_Argval, _Class>,
is_base_of<_Class, _Argval>>::value,
__result_of_memobj_ref<_MemPtr, _Arg>,
__result_of_memobj_deref<_MemPtr, _Arg>
>::type::type type;
};
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_memfun;
template<typename _Res, typename _Class, typename _Arg, typename... _Args>
struct _Result_of_memfun<_Res _Class::*, _Arg, _Args...>
struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
{
private:
typedef _Res _Class::* _Func;
template<typename _Tp>
static _Tp _S_get(const _Class&);
template<typename _Tp>
static _Tp _S_get(const volatile _Class&);
template<typename _Tp>
static decltype(*std::declval<_Tp>()) _S_get(...);
public:
typedef
decltype((_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
(std::declval<_Args>()...) )
__type;
typedef typename remove_cv<typename remove_reference<
_Arg>::type>::type _Argval;
typedef _Res _Class::* _MemPtr;
typedef typename conditional<__or_<is_same<_Argval, _Class>,
is_base_of<_Class, _Argval>>::value,
__result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
__result_of_memfun_deref<_MemPtr, _Arg, _Args...>
>::type::type type;
};
template<bool, bool, typename _Functor, typename... _ArgTypes>
struct _Result_of_impl;
template<typename _Functor, typename... _ArgTypes>
struct _Result_of_impl<false, false, _Functor, _ArgTypes...>
struct __result_of_impl
{
typedef
decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) )
__type;
typedef __failure_type type;
};
template<typename _MemPtr, typename _Arg>
struct _Result_of_impl<true, false, _MemPtr, _Arg>
: _Result_of_memobj<typename decay<_MemPtr>::type, _Arg>
struct __result_of_impl<true, false, _MemPtr, _Arg>
: public __result_of_memobj<typename decay<_MemPtr>::type, _Arg>
{ };
template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
struct _Result_of_impl<false, true, _MemPtr, _Arg, _ArgTypes...>
: _Result_of_memfun<typename decay<_MemPtr>::type, _Arg, _ArgTypes...>
template<typename _MemPtr, typename _Arg, typename... _Args>
struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
: public __result_of_memfun<typename decay<_MemPtr>::type, _Arg, _Args...>
{ };
// [func.require] paragraph 1 bullet 5:
struct __result_of_other_impl
{
template<typename _Fn, typename... _Args>
static __success_type<decltype(
std::declval<_Fn>()(std::declval<_Args>()...)
)> _S_test(int);
template<typename...>
static __failure_type _S_test(...);
};
template<typename _Functor, typename... _ArgTypes>
struct __result_of_impl<false, false, _Functor, _ArgTypes...>
: private __result_of_other_impl
{
typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
};
template<typename _Functor, typename... _ArgTypes>
struct result_of<_Functor(_ArgTypes...)>
: _Result_of_impl<is_member_object_pointer<
typename remove_reference<_Functor>::type >::value,
is_member_function_pointer<
typename remove_reference<_Functor>::type >::value,
_Functor, _ArgTypes...>
{
typedef typename _Result_of_impl<
is_member_object_pointer<
typename remove_reference<_Functor>::type >::value,
: public __result_of_impl<
is_member_object_pointer<
typename remove_reference<_Functor>::type
>::value,
is_member_function_pointer<
typename remove_reference<_Functor>::type >::value,
_Functor, _ArgTypes...>::__type
type;
};
typename remove_reference<_Functor>::type
>::value,
_Functor, _ArgTypes...
>::type
{ };
/**
* Use SFINAE to determine if the type _Tp has a publicly-accessible
* member type _NTYPE.

4
libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc
View File

@ -2,7 +2,7 @@
// { dg-do compile }
// 2009-11-12 Paolo Carlini <paolo.carlini@oracle.com>
//
// Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
// Copyright (C) 2009-2012 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
@ -19,7 +19,7 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-error "static assertion failed" "" { target *-*-* } 1813 }
// { dg-error "static assertion failed" "" { target *-*-* } 1812 }
#include <utility>

17
libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs_neg.cc
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@ -3,8 +3,7 @@
// 2007-05-03 Benjamin Kosnik <bkoz@redhat.com>
//
// Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
// Free Software Foundation, Inc.
// Copyright (C) 2007-2012 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
@ -43,11 +42,11 @@ void test01()
typedef make_signed<float>::type test5_type;
}
// { dg-error "does not name a type" "" { target *-*-* } 34 }
// { dg-error "required from here" "" { target *-*-* } 36 }
// { dg-error "required from here" "" { target *-*-* } 38 }
// { dg-error "required from here" "" { target *-*-* } 41 }
// { dg-error "required from here" "" { target *-*-* } 43 }
// { dg-error "does not name a type" "" { target *-*-* } 33 }
// { dg-error "required from here" "" { target *-*-* } 35 }
// { dg-error "required from here" "" { target *-*-* } 37 }
// { dg-error "required from here" "" { target *-*-* } 40 }
// { dg-error "required from here" "" { target *-*-* } 42 }
// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1602 }
// { dg-error "declaration of" "" { target *-*-* } 1566 }
// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1601 }
// { dg-error "declaration of" "" { target *-*-* } 1565 }

17
libstdc++-v3/testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
View File

@ -3,8 +3,7 @@
// 2007-05-03 Benjamin Kosnik <bkoz@redhat.com>
//
// Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
// Free Software Foundation, Inc.
// Copyright (C) 2007-2012 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
@ -43,11 +42,11 @@ void test01()
typedef make_unsigned<float>::type test5_type;
}
// { dg-error "does not name a type" "" { target *-*-* } 34 }
// { dg-error "required from here" "" { target *-*-* } 36 }
// { dg-error "required from here" "" { target *-*-* } 38 }
// { dg-error "required from here" "" { target *-*-* } 41 }
// { dg-error "required from here" "" { target *-*-* } 43 }
// { dg-error "does not name a type" "" { target *-*-* } 33 }
// { dg-error "required from here" "" { target *-*-* } 35 }
// { dg-error "required from here" "" { target *-*-* } 37 }
// { dg-error "required from here" "" { target *-*-* } 40 }
// { dg-error "required from here" "" { target *-*-* } 42 }
// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1520 }
// { dg-error "declaration of" "" { target *-*-* } 1484 }
// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1519 }
// { dg-error "declaration of" "" { target *-*-* } 1483 }

736
libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_1.cc Normal file
View File

@ -0,0 +1,736 @@
// { dg-options "-std=gnu++11" }
// { dg-do compile }
// 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 <memory>
#include <cstddef>
#include <type_traits>
// TODO: Uncomment the following define once gcc has fixed bug 52748
// (incomplete types in function call expressions):
//#define HAS_52748_FIXED
// Helper types:
struct has_type_impl
{
template<class T, class = typename T::type>
static std::true_type test(int);
template<class>
static std::false_type test(...);
};
template<class T>
struct has_type : decltype(has_type_impl::test<T>(0))
{};
template<class T, class Res>
struct is_expected_type : std::is_same<typename T::type, Res>
{};
template<class T, class Res>
struct is_type : std::__and_<has_type<T>, is_expected_type<T, Res>>
{};
// Types under inspection:
typedef bool (&PF1)();
typedef short (*PF2)(long);
struct S {
operator PF2() const;
double operator()(char, int&);
void calc(long) const;
};
typedef void (S::*PMS)(long) const;
typedef void (S::*PMSnonconst)(long);
typedef int S::* PMI;
struct B {
int i;
void f1() const;
bool f2(int) const volatile;
};
struct D : B {};
typedef void (B::*base_func_void)() const;
typedef bool (B::*base_func_bool_int)(int) const volatile;
struct ident_functor {
template<class T>
T operator()(T&& x);
};
template<class Ret = void>
struct variable_functor {
template<class... T>
Ret operator()(T&&...);
};
struct ident_functor_noref {
template<class T>
typename std::remove_reference<T>::type operator()(T&& x);
};
enum class ScEn;
enum UnScEn : int;
union U {
int i;
double d;
};
union U2 {
int i;
bool b;
void operator()() const;
int operator()(double) const;
bool operator()(double);
U operator()(int, int);
};
struct Ukn;
typedef Ukn (S::*PMSIncomplete)(long) const;
typedef Ukn (S::*PMSIncompletenonconst)(long);
typedef Ukn (*FuncIncomplete)(long);
struct Abstract {
virtual ~Abstract() = 0;
};
struct Private {
private:
void operator()();
int operator()(int);
public:
bool operator()(std::nullptr_t);
};
union PrivateUnion {
double d;
private:
void operator()();
int operator()(int);
public:
bool operator()(std::nullptr_t);
};
template<class T>
struct ImplicitTo {
operator T();
};
template<class>
struct never { static const bool value = false; };
template<class T>
struct BrokenTrait {
static_assert(never<T>::value, "Error!");
typedef T type;
};
template<class T>
struct BadSmartPtr : T {
T& operator*() const noexcept(typename BrokenTrait<T>::type());
};
template<class Ret>
using FuncEllipses = Ret(...);
static_assert(is_type<std::result_of<S(int)>, short>::value, "Error!");
static_assert(is_type<std::result_of<S&(unsigned char, int&)>,
double>::value, "Error!");
static_assert(is_type<std::result_of<PF1()>, bool>::value, "Error!");
static_assert(is_type<std::result_of<PF1&()>, bool>::value, "Error!");
static_assert(is_type<std::result_of<PMS(std::unique_ptr<S>, int)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<PMS(std::unique_ptr<S>&, unsigned&)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<PMS&(std::unique_ptr<S>, int)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<PMS&(std::unique_ptr<S>&, unsigned&)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(int)>,
int>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(const int)>,
int>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(const int&&)>,
int>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(int&&)>,
int>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(int&)>,
int&>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(const B)>,
B>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(const B&&)>,
const B>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(B&&)>, B>::value, "Error!");
static_assert(is_type<std::result_of<ident_functor(B&)>, B&>::value, "Error!");
static_assert(is_type<std::result_of<int B::*(B&)>, int&>::value, "Error!");
// This is expected as of CWG 616 P/R:
static_assert(is_type<std::result_of<int B::*(B)>, int&&>::value, "Error!");
static_assert(is_type<std::result_of<volatile int B::*(const B&&)>,
const volatile int&&>::value, "Error!");
static_assert(is_type<std::result_of<const int B::*(volatile B&&)>,
const volatile int&&>::value, "Error!");
static_assert(is_type<std::result_of<int B::*(const B&)>,
const int&>::value, "Error!");
static_assert(is_type<std::result_of<volatile int B::*(const B&)>,
const volatile int&>::value, "Error!");
static_assert(is_type<std::result_of<const int B::*(volatile B&)>,
const volatile int&>::value, "Error!");
static_assert(is_type<std::result_of<int B::*(B*)>, int&>::value, "Error!");
static_assert(is_type<std::result_of<int B::*(B*&)>, int&>(), "Error!");
static_assert(is_type<std::result_of<int B::*(const B*)>,
const int&>::value, "Error!");
static_assert(is_type<std::result_of<int B::*(const B*&)>,
const int&>::value, "Error!");
static_assert(is_type<std::result_of<volatile int B::*(const B*)>,
const volatile int&>::value, "Error!");
static_assert(is_type<std::result_of<const int B::*(volatile B*)>,
const volatile int&>::value, "Error!");
static_assert(is_type<std::result_of<base_func_void(const B&)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<base_func_void(const B*)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<base_func_void(B&)>,
void>::value, "Error!");
static_assert(is_type<std::result_of<base_func_void(B*)>,
void>::value, "Error!");
static_assert(!has_type<std::result_of<base_func_void(volatile B&)>>::value,
"Error!");
static_assert(!has_type<std::result_of<base_func_void(volatile B*)>>::value,
"Error!");
static_assert(is_type<std::result_of<base_func_bool_int(B&, long)>,
bool>::value, "Error!");
static_assert(is_type<std::result_of<base_func_bool_int(B*, long)>,
bool>::value, "Error!");
static_assert(is_type<std::result_of<base_func_bool_int(volatile B&, long)>,
bool>::value, "Error!");
static_assert(is_type<std::result_of<base_func_bool_int(volatile B*, long)>,
bool>::value, "Error!");
static_assert(!has_type<std::result_of<int()>>(), "Error!");
static_assert(!has_type<std::result_of<void()>>(), "Error!");
static_assert(!has_type<std::result_of<int(int)>>(), "Error!");
static_assert(!has_type<std::result_of<void(int)>>(), "Error!");
static_assert(!has_type<std::result_of<PF1(int)>>(), "Error!");
static_assert(is_type<std::result_of<PF2(long)>, short>(), "Error!");
static_assert(!has_type<std::result_of<PF2()>>(), "Error!");
static_assert(!has_type<std::result_of<PF2(B)>>(), "Error!");
static_assert(!has_type<std::result_of<PF2(ScEn)>>(), "Error!");
static_assert(is_type<std::result_of<PF2(UnScEn)>, short>(), "Error!");
static_assert(!has_type<std::result_of<PF2(long, int)>>(), "Error!");
static_assert(is_type<std::result_of<PMS(std::unique_ptr<S>, int)>, void>(),
"Error!");
static_assert(!has_type<std::result_of<PMS(int)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(int, std::unique_ptr<S>)>>(), "Error!");
// Argument number mismatch:
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>&)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>, int, bool)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>&, int, bool)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMS(S)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(S&)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(S, int, bool)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(S&, int, bool)>>(), "Error!");
// Non-convertible arguments:
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>, S)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMS(std::unique_ptr<S>&, S)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMS(S, S)>>(), "Error!");
static_assert(!has_type<std::result_of<PMS(S&, S)>>(), "Error!");
// cv-violations:
static_assert(!has_type<std::result_of<PMSnonconst(const S&, long)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMSnonconst(const S&&, long)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMSnonconst(const S*, long)>>(),
"Error!");
static_assert(!has_type<std::result_of<PMSnonconst(const S*&, long)>>(),
"Error!");
static_assert(is_type<std::result_of<PMI(S*)>, int&>(), "Error!");
static_assert(is_type<std::result_of<PMI(S&)>, int&>(), "Error!");
static_assert(is_type<std::result_of<PMI(S&&)>, int&&>(), "Error!");
static_assert(is_type<std::result_of<PMI(S)>, int&&>(), "Error!");
static_assert(!has_type<std::result_of<PMI()>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(S*, int)>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(S&, int)>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(S*, int, S, bool)>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(S&, int, S, bool)>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(B*)>>(), "Error!");
static_assert(!has_type<std::result_of<PMI(B&)>>(), "Error!");
static_assert(is_type<std::result_of<int U::*(U)>, int&&>(), "Error!");
static_assert(is_type<std::result_of<int U::*(U&)>, int&>(), "Error!");
static_assert(is_type<std::result_of<int U::*(const U&)>, const int&>(),
"Error!");
static_assert(is_type<std::result_of
<volatile int U::*(const U&)>, const volatile int&>(), "Error!");
static_assert(is_type<std::result_of
<const int U::*(volatile U&)>, const volatile int&>(), "Error!");
static_assert(is_type<std::result_of<int Ukn::*(Ukn*)>, int&>(), "Error!");
static_assert(is_type<std::result_of<int Ukn::*(Ukn&)>, int&>(), "Error!");
static_assert(is_type<std::result_of<int Ukn::*(Ukn&&)>, int&&>(), "Error!");
static_assert(is_type<std::result_of<int Ukn::*(const Ukn*)>, const int&>(),
"Error!");
static_assert(is_type<std::result_of<int Ukn::*(const Ukn&)>, const int&>(),
"Error!");
static_assert(is_type<std::result_of<int Ukn::*(const Ukn&&)>, const int&&>(),
"Error!");
typedef void (Ukn::* PUfnMF)();
typedef void (Ukn::* PUfnConstMF)() const;
static_assert(is_type<std::result_of<PUfnMF(Ukn*)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnMF(Ukn&)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnMF(Ukn&&)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnConstMF(Ukn*)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnConstMF(Ukn&)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnConstMF(Ukn&&)>, void>(), "Error!");
static_assert(is_type<std::result_of<PUfnConstMF(const Ukn*)>, void>(),
"Error!");
static_assert(is_type<std::result_of<PUfnConstMF(const Ukn&)>, void>(),
"Error!");
static_assert(is_type<std::result_of<PUfnConstMF(const Ukn&&)>, void>(),
"Error!");
static_assert(!has_type<std::result_of<S()>>(), "Error!");
static_assert(!has_type<std::result_of<S(int, S)>>(), "Error!");
static_assert(!has_type<std::result_of<S(S)>>(), "Error!");
static_assert(!has_type<std::result_of
<S(double, bool, std::nullptr_t, Ukn&)>>(), "Error!");
static_assert(is_type<std::result_of<U2()>, void>(), "Error!");
static_assert(is_type<std::result_of<const U2&()>, void>(), "Error!");
static_assert(is_type<std::result_of<U2&()>, void>(), "Error!");
static_assert(is_type<std::result_of<U2(double)>, bool>(), "Error!");
static_assert(is_type<std::result_of<const U2&(double)>, int>(), "Error!");
static_assert(is_type<std::result_of<U2&(double)>, bool>(), "Error!");
static_assert(is_type<std::result_of<U2(int)>, bool>(), "Error!");
static_assert(is_type<std::result_of<U2&(int)>, bool>(), "Error!");
static_assert(is_type<std::result_of<const U2&(int)>, int>(), "Error!");
static_assert(is_type<std::result_of<U2(int, int)>, U>(), "Error!");
static_assert(is_type<std::result_of<U2&(int, int)>, U>(), "Error!");
static_assert(!has_type<std::result_of<const U2&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<U2(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<U2&(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const U2&(int, int, int)>>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(int)>, int>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(const volatile int)>,
int>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(int&)>, int&>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(const volatile int&)>,
const volatile int&>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(int&&)>, int>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(const volatile int&&)>,
int>(), "Error!");
static_assert(is_type<std::result_of<ident_functor(Abstract&)>, Abstract&>(),
"Error!");
static_assert(is_type<std::result_of<ident_functor(const volatile Abstract&)>,
const volatile Abstract&>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor(int(&&)[1])>>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor(Abstract&&)>>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor(const int(&&)[1])>>(),
"Error!");
static_assert(!has_type<std::result_of<ident_functor(const Abstract&&)>>(),
"Error!");
static_assert(!has_type<std::result_of<ident_functor_noref(int(&)[1])>>(),
"Error!");
static_assert(!has_type<std::result_of<ident_functor_noref
(const int(&)[1])>>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor_noref(Abstract&)>>(),
"Error!");
static_assert(!has_type<std::result_of
<ident_functor_noref(const Abstract&)>>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor_noref(void(&)())>>(),
"Error!");
static_assert(!has_type<std::result_of<ident_functor_noref(void(&&)())>>(),
"Error!");
static_assert(!has_type<std::result_of<ident_functor()>>(), "Error!");
static_assert(!has_type<std::result_of<ident_functor(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const ident_functor&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<const ident_functor&&(int)>>(),
"Error!");
// Border-line case:
static_assert(!has_type<std::result_of<int S::*(Ukn*)>>(), "Error!");
static_assert(!has_type<std::result_of<void (S::*(Ukn*))()>>(), "Error!");
// We want to allow this, it seems to be required by the order described
// in [func.require] p1:
static_assert(is_type<std::result_of<int S::*(BadSmartPtr<S>&)>, int&>(),
"Error!");
static_assert(is_type<std::result_of<Private(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<Private&(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<Private&&(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<Private(ImplicitTo<std::nullptr_t>)>,
bool>(), "Error!");
static_assert(is_type<std::result_of<Private&(ImplicitTo<std::nullptr_t>)>,
bool>(), "Error!");
static_assert(is_type<std::result_of<Private&&(ImplicitTo<std::nullptr_t>)>,
bool>(), "Error!");
static_assert(!has_type<std::result_of<const Private&(std::nullptr_t)>>(),
"Error!");
static_assert(!has_type<std::result_of<const Private&&(std::nullptr_t)>>(),
"Error!");
static_assert(!has_type<std::result_of<Private()>>(), "Error!");
static_assert(!has_type<std::result_of<Private(int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private&()>>(), "Error!");
static_assert(!has_type<std::result_of<Private&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&()>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private&&()>>(), "Error!");
static_assert(!has_type<std::result_of<Private&&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private&&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&&()>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<Private(ScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<Private(UnScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&(ScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<const Private&(UnScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<Private(ImplicitTo<ScEn>)>>(), "Error!");
static_assert(!has_type<std::result_of<Private(ImplicitTo<UnScEn>)>>(),
"Error!");
static_assert(!has_type<std::result_of<const Private&(ImplicitTo<ScEn>)>>(),
"Error!");
static_assert(!has_type<std::result_of<const Private&(ImplicitTo<UnScEn>)>>(),
"Error!");
static_assert(is_type<std::result_of<PrivateUnion(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<PrivateUnion&(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<PrivateUnion&&(std::nullptr_t)>, bool>(),
"Error!");
static_assert(is_type<std::result_of<PrivateUnion(ImplicitTo<std::nullptr_t>)>,
bool>(), "Error!");
static_assert(is_type<std::result_of
<PrivateUnion&(ImplicitTo<std::nullptr_t>)>, bool>(), "Error!");
static_assert(is_type<std::result_of
<PrivateUnion&&(ImplicitTo<std::nullptr_t>)>, bool>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&(std::nullptr_t)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const PrivateUnion&&(std::nullptr_t)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion()>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion(int)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion&()>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&()>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&(int, int)>>(),
"Error!");
static_assert(!has_type<std::result_of<PrivateUnion&&()>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion&&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion&&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&&()>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&&(int)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&&(int, int)>>(),
"Error!");
static_assert(!has_type<std::result_of<PrivateUnion(ScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<PrivateUnion(UnScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&(ScEn)>>(), "Error!");
static_assert(!has_type<std::result_of<const PrivateUnion&(UnScEn)>>(),
"Error!");
static_assert(!has_type<std::result_of<PrivateUnion(ImplicitTo<ScEn>)>>(),
"Error!");
static_assert(!has_type<std::result_of<PrivateUnion(ImplicitTo<UnScEn>)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const PrivateUnion&(ImplicitTo<ScEn>)>>(), "Error!");
static_assert(!has_type<std::result_of
<const PrivateUnion&(ImplicitTo<UnScEn>)>>(), "Error!");
static_assert(is_type<std::result_of<void(*(bool))(int)>, void>(), "Error!");
static_assert(is_type<std::result_of<void(*(UnScEn))(int)>, void>(), "Error!");
static_assert(is_type<std::result_of<void(*(ImplicitTo<int>))(int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<void(*(ImplicitTo<int>&))(int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<void(*(ImplicitTo<int>&&))(int)>, void>(),
"Error!");
static_assert(!has_type<std::result_of<void(*(ScEn))(int)>>(), "Error!");
static_assert(!has_type<std::result_of
<void(*(const ImplicitTo<int>&))(int)>>(), "Error!");
static_assert(!has_type<std::result_of
<void(*(const ImplicitTo<int>&&))(int)>>(), "Error!");
static_assert(is_type<std::result_of<ImplicitTo<void(*)()>()>, void>(),
"Error!");
static_assert(is_type<std::result_of<ImplicitTo<void(&)()>()>, void>(),
"Error!");
static_assert(!has_type<std::result_of<ImplicitTo<void(*)()>(int)>>(),
"Error!");
static_assert(!has_type<std::result_of<ImplicitTo<void(*)(int)>()>>(),
"Error!");
static_assert(!has_type<std::result_of<ImplicitTo<void(&)()>(int)>>(),
"Error!");
static_assert(!has_type<std::result_of<ImplicitTo<void(&)(int)>()>>(),
"Error!");
// Conversion operators of types are not considered in call expressions
// (except for conversion to function pointer/reference):
static_assert(!has_type<std::result_of<ImplicitTo<S>(char, int&)>>(), "Error!");
static_assert(!has_type<std::result_of<ImplicitTo<ident_functor>(int)>>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<>()>, void>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<>(int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<>(int, int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<>(int, int, int)>,
void>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<>&()>, void>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<>&(int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<>&(int, int)>, void>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<>&(int, int, int)>,
void>(), "Error!");
static_assert(!has_type<std::result_of<const variable_functor<>()>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<>(int)>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<>(int, int)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const variable_functor<>(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const variable_functor<>&()>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<>&(int)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const variable_functor<>&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<>&(int, int, int)>>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<S>()>, S>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<S>(int)>, S>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<S>(int, int)>, S>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<S>(int, int, int)>, S>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<S>&()>, S>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<S>&(int)>, S>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<S>&(int, int)>, S>(),
"Error!");
static_assert(is_type<std::result_of
<variable_functor<S>&(int, int, int)>, S>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>()>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>(int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const variable_functor<S>&()>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<S>&(int)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<S>&(int, int, int)>>(), "Error!");
#if defined(HAS_52748_FIXED)
static_assert(has_type<std::result_of<variable_functor<Ukn>()>>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<Ukn>()>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<Ukn>(int)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<Ukn>(int, int)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of
<variable_functor<Ukn>(int, int, int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<variable_functor<Ukn>&()>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<variable_functor<Ukn>&(int)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of
<variable_functor<Ukn>&(int, int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of
<variable_functor<Ukn>&(int, int, int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<PMSIncomplete(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<PMSIncomplete&(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<PMSIncomplete&&(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncIncomplete(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncIncomplete&(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncIncomplete&&(int)>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>*()>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>&()>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>&&()>, Ukn>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>*(bool)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>&(bool)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>&&(bool)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>*(bool, int, S)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<Ukn>&(bool, int, S)>, Ukn>(),
"Error!");
static_assert(is_type<std::result_of
<FuncEllipses<Ukn>&&(bool, int, S)>, Ukn>(), "Error!");
static_assert(!has_type<std::result_of<PMSIncompletenonconst(const S*)>>(),
"Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*, int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*&)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*&, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*&, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S*&, int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&, int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&&)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&&, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&&, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<PMSIncompletenonconst(const S&&, int, int, int)>>(), "Error!");
#endif
static_assert(!has_type<std::result_of<const variable_functor<Ukn>()>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<Ukn>(int)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const variable_functor<Ukn>(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<Ukn>(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<const variable_functor<Ukn>&()>>(),
"Error!");
static_assert(!has_type<std::result_of<const variable_functor<Ukn>&(int)>>(),
"Error!");
static_assert(!has_type<std::result_of
<const variable_functor<Ukn>&(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of
<const variable_functor<Ukn>&(int, int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete()>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete(S)>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete(int, int)>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete(int, int, int)>>(),
"Error!");
static_assert(!has_type<std::result_of<FuncIncomplete&&()>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete&&(S)>>(), "Error!");
static_assert(!has_type<std::result_of<FuncIncomplete&&(int, int)>>(),
"Error!");
static_assert(!has_type<std::result_of<FuncIncomplete&&(int, int, int)>>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>*()>, int>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>&()>, int>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>&&()>, int>(), "Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>*(bool)>, int>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>&(bool)>, int>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>&&(bool)>, int>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>*(bool, int, S)>, int>(),
"Error!");
static_assert(is_type<std::result_of<FuncEllipses<int>&(bool, int, S)>, int>(),
"Error!");
static_assert(is_type<std::result_of
<FuncEllipses<int>&&(bool, int, S)>, int>(), "Error!");

76
libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_2.cc Normal file
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@ -0,0 +1,76 @@
// { dg-options "-std=gnu++11" }
// { dg-do compile }
// 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/>.
// Taken from N3436:
#include <type_traits>
#include <string>
struct eat { template<class T> eat(T const &) {} };
struct not_incrementable {};
struct inc {
template<class T>
auto operator()(T t) const -> decltype(t++)
{ return t++; }
};
template<class A>
typename std::result_of<inc(A)>::type // sfinae here
try_inc(A a) {
return inc()(a);
}
not_incrementable
try_inc(eat) {
return not_incrementable();
}
template<class>
struct never { static const bool value = false; };
template<class T>
struct Fail
{
static_assert(never<T>::value, "duh");
typedef int type;
};
struct Fun
{
template<class T>
typename Fail<T>::type operator()(T)
{ return 0; }
};
template<class T>
typename std::result_of<Fun(T)>::type foo(T)
{ return 0; }
template<class>
int foo(...)
{ return 0; }
void result_of_sfinae() {
int x = try_inc(1); // OK
not_incrementable y = try_inc(std::string("foo")); // OK, not_incrementable
(void) x;
(void) y;
}