* [PATCH] Make std::invoke usable in constant expressions
@ 2019-10-23 19:29 Jonathan Wakely
2019-10-24 23:22 ` Jonathan Wakely
0 siblings, 1 reply; 3+ messages in thread
From: Jonathan Wakely @ 2019-10-23 19:29 UTC (permalink / raw)
To: libstdc++, gcc-patches
[-- Attachment #1: Type: text/plain, Size: 444 bytes --]
* include/std/functional (invoke): Add constexpr for C++20.
* include/std/version (__cpp_lib_constexpr_invoke): Define.
* testsuite/20_util/function_objects/invoke/constexpr.cc: New test.
This is an easy one, because I already made std::__invoke constexpr,
so all that's needed for C++20 is to add _GLIBCXX20_CONSTEXPR to the
public std::invoke function that calls std::__invoke.
Tested powerpc64le-linux, committed to trunk.
[-- Attachment #2: patch.txt --]
[-- Type: text/plain, Size: 3679 bytes --]
commit dae24283df4341aa66f455c8cee6f7935470f7b5
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Oct 23 17:40:42 2019 +0100
Make std::invoke usable in constant expressions
* include/std/functional (invoke): Add constexpr for C++20.
* include/std/version (__cpp_lib_constexpr_invoke): Define.
* testsuite/20_util/function_objects/invoke/constexpr.cc: New test.
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index 7ad29a1a335..113a13b4a37 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -72,19 +72,22 @@ namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
-#if __cplusplus > 201402L
-# define __cpp_lib_invoke 201411
+#if __cplusplus >= 201703L
+# define __cpp_lib_invoke 201411L
+# if __cplusplus > 201703L
+# define __cpp_lib_constexpr_invoke 201907L
+# endif
/// Invoke a callable object.
template<typename _Callable, typename... _Args>
- inline invoke_result_t<_Callable, _Args...>
+ inline _GLIBCXX20_CONSTEXPR invoke_result_t<_Callable, _Args...>
invoke(_Callable&& __fn, _Args&&... __args)
noexcept(is_nothrow_invocable_v<_Callable, _Args...>)
{
return std::__invoke(std::forward<_Callable>(__fn),
std::forward<_Args>(__args)...);
}
-#endif
+#endif // C++17
template<typename _MemFunPtr,
bool __is_mem_fn = is_member_function_pointer<_MemFunPtr>::value>
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index 21cc28b3450..ccaedd090b0 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -158,6 +158,7 @@
#endif
#define __cpp_lib_constexpr 201711L
#define __cpp_lib_constexpr_algorithms 201806L
+#define __cpp_lib_constexpr_invoke 201907L
#if __cpp_impl_destroying_delete
# define __cpp_lib_destroying_delete 201806L
#endif
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/invoke/constexpr.cc b/libstdc++-v3/testsuite/20_util/function_objects/invoke/constexpr.cc
new file mode 100644
index 00000000000..f65caa21936
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/invoke/constexpr.cc
@@ -0,0 +1,38 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+#ifndef __cpp_lib_constexpr_invoke
+# error "Feature test macro for constexpr invoke is missing"
+#elif __cpp_lib_constexpr_invoke < 201907L
+# error "Feature test macro for constexpr invoke has wrong value"
+#endif
+
+constexpr int inc(int i) { return i + 1; }
+constexpr auto inc_f = &inc;
+static_assert( std::invoke(inc_f, 2) == 3);
+
+struct Dec
+{
+ constexpr int operator()(int i) const { return i - 1; }
+};
+
+static_assert( std::invoke(Dec{}, 5) == 4 );
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Make std::invoke usable in constant expressions
2019-10-23 19:29 [PATCH] Make std::invoke usable in constant expressions Jonathan Wakely
@ 2019-10-24 23:22 ` Jonathan Wakely
2019-10-31 23:03 ` Jonathan Wakely
0 siblings, 1 reply; 3+ messages in thread
From: Jonathan Wakely @ 2019-10-24 23:22 UTC (permalink / raw)
To: libstdc++, gcc-patches
On 23/10/19 20:28 +0100, Jonathan Wakely wrote:
> * include/std/functional (invoke): Add constexpr for C++20.
> * include/std/version (__cpp_lib_constexpr_invoke): Define.
> * testsuite/20_util/function_objects/invoke/constexpr.cc: New test.
>
>This is an easy one, because I already made std::__invoke constexpr,
>so all that's needed for C++20 is to add _GLIBCXX20_CONSTEXPR to the
>public std::invoke function that calls std::__invoke.
For some reason I thought this change only affected std::invokee, but
P1065R2 affects other functions too. I'll fix those tomorrow.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Make std::invoke usable in constant expressions
2019-10-24 23:22 ` Jonathan Wakely
@ 2019-10-31 23:03 ` Jonathan Wakely
0 siblings, 0 replies; 3+ messages in thread
From: Jonathan Wakely @ 2019-10-31 23:03 UTC (permalink / raw)
To: libstdc++, gcc-patches
[-- Attachment #1: Type: text/plain, Size: 748 bytes --]
On 25/10/19 00:22 +0100, Jonathan Wakely wrote:
>On 23/10/19 20:28 +0100, Jonathan Wakely wrote:
>> * include/std/functional (invoke): Add constexpr for C++20.
>> * include/std/version (__cpp_lib_constexpr_invoke): Define.
>> * testsuite/20_util/function_objects/invoke/constexpr.cc: New test.
>>
>>This is an easy one, because I already made std::__invoke constexpr,
>>so all that's needed for C++20 is to add _GLIBCXX20_CONSTEXPR to the
>>public std::invoke function that calls std::__invoke.
>
>For some reason I thought this change only affected std::invokee, but
>P1065R2 affects other functions too. I'll fix those tomorrow.
Here's the patch for the other parts of P1065R2.
Tested powerpc64le-linux, committed to trunk/
[-- Attachment #2: patch.txt --]
[-- Type: text/x-patch, Size: 19614 bytes --]
commit 01d276cce42ab417fcd99336ca4b7d75a2861ae8
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Oct 31 22:30:24 2019 +0000
Add remaining changes from P1065R2 "constexpr INVOKE"
* include/bits/refwrap.h (reference_wrapper, ref, cref): Add constexpr
specifiers for C++20.
* include/std/functional (_Mem_fn, mem_fn, _Bind, _Bind_result, bind)
(bind_front, _Not_fn, not_fn): Likewise.
* testsuite/20_util/bind/constexpr.cc: New test.
* testsuite/20_util/function_objects/bind_front/constexpr.cc: New test.
* testsuite/20_util/function_objects/mem_fn/constexpr.cc: New test.
* testsuite/20_util/function_objects/not_fn/constexpr.cc: New test.
* testsuite/20_util/reference_wrapper/constexpr.cc: New test.
diff --git a/libstdc++-v3/include/bits/refwrap.h b/libstdc++-v3/include/bits/refwrap.h
index e810988cd4f..41e4653f246 100644
--- a/libstdc++-v3/include/bits/refwrap.h
+++ b/libstdc++-v3/include/bits/refwrap.h
@@ -300,7 +300,9 @@ _GLIBCXX_MEM_FN_TRAITS(&& noexcept, false_type, true_type)
{
_Tp* _M_data;
+ _GLIBCXX20_CONSTEXPR
static _Tp* _S_fun(_Tp& __r) noexcept { return std::__addressof(__r); }
+
static void _S_fun(_Tp&&) = delete;
template<typename _Up, typename _Up2 = __remove_cvref_t<_Up>>
@@ -315,6 +317,7 @@ _GLIBCXX_MEM_FN_TRAITS(&& noexcept, false_type, true_type)
// 3041. Unnecessary decay in reference_wrapper
template<typename _Up, typename = __not_same<_Up>, typename
= decltype(reference_wrapper::_S_fun(std::declval<_Up>()))>
+ _GLIBCXX20_CONSTEXPR
reference_wrapper(_Up&& __uref)
noexcept(noexcept(reference_wrapper::_S_fun(std::declval<_Up>())))
: _M_data(reference_wrapper::_S_fun(std::forward<_Up>(__uref)))
@@ -325,14 +328,17 @@ _GLIBCXX_MEM_FN_TRAITS(&& noexcept, false_type, true_type)
reference_wrapper&
operator=(const reference_wrapper&) = default;
+ _GLIBCXX20_CONSTEXPR
operator _Tp&() const noexcept
{ return this->get(); }
+ _GLIBCXX20_CONSTEXPR
_Tp&
get() const noexcept
{ return *_M_data; }
template<typename... _Args>
+ _GLIBCXX20_CONSTEXPR
typename result_of<_Tp&(_Args&&...)>::type
operator()(_Args&&... __args) const
{
@@ -352,12 +358,14 @@ _GLIBCXX_MEM_FN_TRAITS(&& noexcept, false_type, true_type)
/// Denotes a reference should be taken to a variable.
template<typename _Tp>
+ _GLIBCXX20_CONSTEXPR
inline reference_wrapper<_Tp>
ref(_Tp& __t) noexcept
{ return reference_wrapper<_Tp>(__t); }
/// Denotes a const reference should be taken to a variable.
template<typename _Tp>
+ _GLIBCXX20_CONSTEXPR
inline reference_wrapper<const _Tp>
cref(const _Tp& __t) noexcept
{ return reference_wrapper<const _Tp>(__t); }
@@ -370,12 +378,14 @@ _GLIBCXX_MEM_FN_TRAITS(&& noexcept, false_type, true_type)
/// std::ref overload to prevent wrapping a reference_wrapper
template<typename _Tp>
+ _GLIBCXX20_CONSTEXPR
inline reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) noexcept
{ return __t; }
/// std::cref overload to prevent wrapping a reference_wrapper
template<typename _Tp>
+ _GLIBCXX20_CONSTEXPR
inline reference_wrapper<const _Tp>
cref(reference_wrapper<_Tp> __t) noexcept
{ return { __t.get() }; }
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index 113a13b4a37..dad7781378b 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -112,6 +112,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Mem_fn_base(_MemFunPtr __pmf) noexcept : _M_pmf(__pmf) { }
template<typename... _Args>
+ _GLIBCXX20_CONSTEXPR
auto
operator()(_Args&&... __args) const
noexcept(noexcept(
@@ -137,6 +138,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Mem_fn_base(_MemObjPtr __pm) noexcept : _M_pm(__pm) { }
template<typename _Tp>
+ _GLIBCXX20_CONSTEXPR
auto
operator()(_Tp&& __obj) const
noexcept(noexcept(std::__invoke(_M_pm, std::forward<_Tp>(__obj))))
@@ -162,6 +164,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @ingroup functors
*/
template<typename _Tp, typename _Class>
+ _GLIBCXX20_CONSTEXPR
inline _Mem_fn<_Tp _Class::*>
mem_fn(_Tp _Class::* __pm) noexcept
{
@@ -297,6 +300,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* but not volatile-qualified. This might be a defect in the TR.
*/
template<typename _CVRef, typename _Tuple>
+ _GLIBCXX20_CONSTEXPR
_Tp&
operator()(_CVRef& __arg, _Tuple&) const volatile
{ return __arg.get(); }
@@ -313,6 +317,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
public:
template<typename _CVArg, typename... _Args>
+ _GLIBCXX20_CONSTEXPR
auto
operator()(_CVArg& __arg,
tuple<_Args...>& __tuple) const volatile
@@ -328,6 +333,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Invokes the underlying function object __arg by unpacking all
// of the arguments in the tuple.
template<typename _CVArg, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
auto
__call(_CVArg& __arg, tuple<_Args...>& __tuple,
const _Index_tuple<_Indexes...>&) const volatile
@@ -347,6 +353,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
public:
template<typename _Tuple>
+ _GLIBCXX20_CONSTEXPR
_Safe_tuple_element_t<(is_placeholder<_Arg>::value - 1), _Tuple>&&
operator()(const volatile _Arg&, _Tuple& __tuple) const volatile
{
@@ -365,6 +372,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
public:
template<typename _CVArg, typename _Tuple>
+ _GLIBCXX20_CONSTEXPR
_CVArg&&
operator()(_CVArg&& __arg, _Tuple&) const volatile
{ return std::forward<_CVArg>(__arg); }
@@ -400,6 +408,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call unqualified
template<typename _Result, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
{
@@ -410,6 +419,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as const
template<typename _Result, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Result
__call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
{
@@ -464,24 +474,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
public:
template<typename... _Args>
- explicit _Bind(const _Functor& __f, _Args&&... __args)
+ explicit _GLIBCXX20_CONSTEXPR
+ _Bind(const _Functor& __f, _Args&&... __args)
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
{ }
template<typename... _Args>
- explicit _Bind(_Functor&& __f, _Args&&... __args)
+ explicit _GLIBCXX20_CONSTEXPR
+ _Bind(_Functor&& __f, _Args&&... __args)
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
{ }
_Bind(const _Bind&) = default;
-
- _Bind(_Bind&& __b)
- : _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
- { }
+ _Bind(_Bind&&) = default;
// Call unqualified
template<typename... _Args,
typename _Result = _Res_type<tuple<_Args...>>>
+ _GLIBCXX20_CONSTEXPR
_Result
operator()(_Args&&... __args)
{
@@ -493,6 +503,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as const
template<typename... _Args,
typename _Result = _Res_type_cv<tuple<_Args...>, add_const>>
+ _GLIBCXX20_CONSTEXPR
_Result
operator()(_Args&&... __args) const
{
@@ -547,6 +558,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call unqualified
template<typename _Res, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Res
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
{
@@ -556,6 +568,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as const
template<typename _Res, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Res
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
{
@@ -565,6 +578,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as volatile
template<typename _Res, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Res
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) volatile
{
@@ -574,6 +588,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as const volatile
template<typename _Res, typename... _Args, std::size_t... _Indexes>
+ _GLIBCXX20_CONSTEXPR
_Res
__call(tuple<_Args...>&& __args,
_Index_tuple<_Indexes...>) const volatile
@@ -586,23 +601,23 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typedef _Result result_type;
template<typename... _Args>
- explicit _Bind_result(const _Functor& __f, _Args&&... __args)
+ explicit _GLIBCXX20_CONSTEXPR
+ _Bind_result(const _Functor& __f, _Args&&... __args)
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
{ }
template<typename... _Args>
- explicit _Bind_result(_Functor&& __f, _Args&&... __args)
+ explicit _GLIBCXX20_CONSTEXPR
+ _Bind_result(_Functor&& __f, _Args&&... __args)
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
{ }
_Bind_result(const _Bind_result&) = default;
-
- _Bind_result(_Bind_result&& __b)
- : _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
- { }
+ _Bind_result(_Bind_result&&) = default;
// Call unqualified
template<typename... _Args>
+ _GLIBCXX20_CONSTEXPR
result_type
operator()(_Args&&... __args)
{
@@ -613,6 +628,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Call as const
template<typename... _Args>
+ _GLIBCXX20_CONSTEXPR
result_type
operator()(_Args&&... __args) const
{
@@ -763,7 +779,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @ingroup binders
*/
template<typename _Func, typename... _BoundArgs>
- inline typename
+ inline _GLIBCXX20_CONSTEXPR typename
_Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::type
bind(_Func&& __f, _BoundArgs&&... __args)
{
@@ -787,7 +803,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* @ingroup binders
*/
template<typename _Result, typename _Func, typename... _BoundArgs>
- inline
+ inline _GLIBCXX20_CONSTEXPR
typename _Bindres_helper<_Result, _Func, _BoundArgs...>::type
bind(_Func&& __f, _BoundArgs&&... __args)
{
@@ -886,7 +902,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
= _Bind_front<decay_t<_Fn>, decay_t<_Args>...>;
template<typename _Fn, typename... _Args>
- _Bind_front_t<_Fn, _Args...>
+ constexpr _Bind_front_t<_Fn, _Args...>
bind_front(_Fn&& __fn, _Args&&... __args)
noexcept(is_nothrow_constructible_v<int, _Bind_front_t<_Fn, _Args...>,
_Fn, _Args...>)
@@ -910,6 +926,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
public:
template<typename _Fn2>
+ constexpr
_Not_fn(_Fn2&& __fn, int)
: _M_fn(std::forward<_Fn2>(__fn)) { }
@@ -922,6 +939,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// and deducing the return type and exception-specification.
#define _GLIBCXX_NOT_FN_CALL_OP( _QUALS ) \
template<typename... _Args> \
+ _GLIBCXX20_CONSTEXPR \
decltype(_S_not<__inv_res_t<_Fn _QUALS, _Args...>>()) \
operator()(_Args&&... __args) _QUALS \
noexcept(__is_nothrow_invocable<_Fn _QUALS, _Args...>::value \
@@ -966,6 +984,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#define __cpp_lib_not_fn 201603
/// [func.not_fn] Function template not_fn
template<typename _Fn>
+ _GLIBCXX20_CONSTEXPR
inline auto
not_fn(_Fn&& __fn)
noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value)
diff --git a/libstdc++-v3/testsuite/20_util/bind/constexpr.cc b/libstdc++-v3/testsuite/20_util/bind/constexpr.cc
new file mode 100644
index 00000000000..6761c2c92a1
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bind/constexpr.cc
@@ -0,0 +1,43 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+struct add
+{
+ constexpr int operator()(int i, int j) const { return i + j; }
+};
+
+constexpr int
+test01(int i, int j)
+{
+ add a;
+ return std::bind(a, i, std::placeholders::_1)(j);
+}
+
+static_assert( test01(1, 2) == 3 );
+
+constexpr int
+test02(int i, int j)
+{
+ return std::bind<int>(add{}, i, std::placeholders::_1)(j);
+}
+
+static_assert( test02(4, 5) == 9 );
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/bind_front/constexpr.cc b/libstdc++-v3/testsuite/20_util/function_objects/bind_front/constexpr.cc
new file mode 100644
index 00000000000..ee82745ddb7
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/bind_front/constexpr.cc
@@ -0,0 +1,35 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+struct add
+{
+ constexpr int operator()(int i, int j) const { return i + j; }
+};
+
+constexpr int
+test01(int i, int j)
+{
+ add a;
+ return std::bind_front(a, i)(j);
+}
+
+static_assert( test01(1, 2) == 3 );
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/constexpr.cc b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/constexpr.cc
new file mode 100644
index 00000000000..6a0d0616baa
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/constexpr.cc
@@ -0,0 +1,45 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+struct F
+{
+ int i;
+ constexpr int add(int j) { return i + j; }
+};
+
+constexpr int
+test01(int i)
+{
+ F f{i};
+ return std::mem_fn(&F::i)(f);
+}
+
+static_assert( test01(2) == 2 );
+
+constexpr int
+test02(int i, int j)
+{
+ F f{i};
+ return std::mem_fn(&F::add)(&f, j);
+}
+
+static_assert( test02(3, 4) == 7 );
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/not_fn/constexpr.cc b/libstdc++-v3/testsuite/20_util/function_objects/not_fn/constexpr.cc
new file mode 100644
index 00000000000..1c0e737fb7d
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/not_fn/constexpr.cc
@@ -0,0 +1,35 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+struct F
+{
+ constexpr bool operator()(int i, int j) const { return i == j; }
+};
+
+constexpr int
+test01(int i, int j)
+{
+ F f;
+ return std::not_fn(f)(1, 2);
+}
+
+static_assert( test01(1, 2) );
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/constexpr.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/constexpr.cc
new file mode 100644
index 00000000000..8a1c54eea7f
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/constexpr.cc
@@ -0,0 +1,45 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <functional>
+
+struct F
+{
+ constexpr int operator()(int i, int j) { return i + j; }
+ constexpr int operator()(int i, int j) const { return i * j; }
+};
+
+constexpr int
+test01(int i, int j)
+{
+ F f;
+ return std::ref(std::ref(f))(i, j);
+}
+
+static_assert( test01(1, 2) == 3 );
+
+constexpr int
+test02(int i, int j)
+{
+ F f;
+ return std::cref(std::cref(f))(i, j);
+}
+
+static_assert( test02(4, 5) == 20 );
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-10-23 19:29 [PATCH] Make std::invoke usable in constant expressions Jonathan Wakely
2019-10-24 23:22 ` Jonathan Wakely
2019-10-31 23:03 ` Jonathan Wakely
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