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[libcxx] Fix PR 22468 - std::function<void()> does not accept non-void-returning functions

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Summary:
The bug can be found here: http://llvm.org/bugs/show_bug.cgi?id=22468

`__invoke_void_return_wrapper` is needed to properly handle calling a function that returns a value but where the std::function return type is void. Without this '-Wsystem-headers' will cause `function::operator()(...)` to not compile. 

Reviewers: eugenis, K-ballo, mclow.lists

Reviewed By: mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D7444

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@228705 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2015-02-10 16:48:45 +00:00
parent 31cb7fe75e
commit c3231d213a
8 changed files with 169 additions and 6 deletions
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20
include/__functional_base
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@@ -419,6 +419,26 @@ struct __invoke_return
typedef decltype(__invoke(_VSTD::declval<_Tp>(), _VSTD::declval<_Args>()...)) type;
};
template <class _Ret>
struct __invoke_void_return_wrapper
{
template <class ..._Args>
static _Ret __call(_Args&&... __args)
{
return __invoke(_VSTD::forward<_Args>(__args)...);
}
};
template <>
struct __invoke_void_return_wrapper<void>
{
template <class ..._Args>
static void __call(_Args&&... __args)
{
__invoke(_VSTD::forward<_Args>(__args)...);
}
};
template <class _Tp>
class _LIBCPP_TYPE_VIS_ONLY reference_wrapper
: public __weak_result_type<_Tp>