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Add C++17 std::not_fn negator.

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Summary:
Exactly what it sounds like.

I plan to commit this in a couple of days assuming no objections.

Reviewers: mclow.lists, EricWF

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D20799

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@271464 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-06-02 01:25:41 +00:00
parent a27cbf8a13
commit c230822a61
4 changed files with 627 additions and 4 deletions
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49
include/functional
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@@ -207,6 +207,8 @@ public:
template <class Predicate> binary_negate<Predicate> not2(const Predicate& pred);
template <class F> unspecified not_fn(F&& f); // C++17
template<class T> struct is_bind_expression;
template<class T> struct is_placeholder;
@@ -2585,11 +2587,54 @@ struct _LIBCPP_TYPE_VIS_ONLY hash
#if _LIBCPP_STD_VER > 14
template <class _Fn, class ..._Args>
result_of_t<_Fn&&(_Args&&...)>
invoke(_Fn&& __f, _Args&&... __args) {
return __invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
invoke(_Fn&& __f, _Args&&... __args)
noexcept(noexcept(_VSTD::__invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...)))
{
return _VSTD::__invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
}
template <class _DecayFunc>
class _LIBCPP_TYPE_VIS_ONLY __not_fn_imp {
_DecayFunc __fd;
public:
__not_fn_imp() = delete;
template <class ..._Args>
_LIBCPP_INLINE_VISIBILITY
auto operator()(_Args&& ...__args)
noexcept(noexcept(!_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...)))
-> decltype(!_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...))
{ return !_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...); }
template <class ..._Args>
_LIBCPP_INLINE_VISIBILITY
auto operator()(_Args&& ...__args) const
noexcept(noexcept(!_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...)))
-> decltype(!_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...))
{ return !_VSTD::invoke(__fd, _VSTD::forward<_Args>(__args)...); }
private:
template <class _RawFunc,
class = enable_if_t<!is_same<decay_t<_RawFunc>, __not_fn_imp>::value>>
_LIBCPP_INLINE_VISIBILITY
explicit __not_fn_imp(_RawFunc&& __rf)
: __fd(_VSTD::forward<_RawFunc>(__rf)) {}
template <class _RawFunc>
friend inline _LIBCPP_INLINE_VISIBILITY
__not_fn_imp<decay_t<_RawFunc>> not_fn(_RawFunc&&);
};
template <class _RawFunc>
inline _LIBCPP_INLINE_VISIBILITY
__not_fn_imp<decay_t<_RawFunc>> not_fn(_RawFunc&& __fn) {
return __not_fn_imp<decay_t<_RawFunc>>(_VSTD::forward<_RawFunc>(__fn));
}
#endif
// struct hash<T*> in <memory>