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Cleanup C++03 __invoke for Bullets 3 and 4. 

The key changes in this patch are:

1. Remove the zero-argument overload in mem_fn. A member function must always
   be invoked with at least one argument, the class instance. The zero-argument
   operator()() in mem_fn would cause mem_fn to fail to compile when because
   the call to '__invoke(pm)' is not well formed.

2. Prevent evaluation of '__apply_cv<Tp, Ret>' when 'Ret' is a function type.
   'Ret' is a function type whenever 'Ret Tp::*' is a pointer to member function.
   Attempting to add cv and ref qualifiers to a function type can cause a hard
   compile error.

3. Remove the dummy overload __invoke(Rp Tp::*). It was present to help work
   around #1. It will be replaced with a different '__invoke' overload that
   represents a bad call to invoke.

After applying this patch the test func.wrap.func.inv/invoke.pass.cpp now
passes.

llvm-svn: 243370
This commit is contained in:
Eric Fiselier 2015-07-28 02:15:53 +00:00
parent d29116331d
commit e62bda70aa
2 changed files with 9 additions and 19 deletions
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24
libcxx/include/__functional_base_03
View File

@ -408,20 +408,15 @@ template <class _Rp, class _Tp, class _T1>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
is_member_object_pointer<_Rp _Tp::*>::value &&
is_base_of<_Tp, typename remove_reference<_T1>::type>::value,
typename __apply_cv<_T1, _Rp>::type&
>::type
__apply_cv<_T1, _Rp>
>::type::type&
__invoke(_Rp _Tp::* __f, _T1& __t1)
{
return __t1.*__f;
}
template <class _Rp, class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void
__invoke(_Rp _Tp::*)
{
}
// forth bullet
@ -439,10 +434,9 @@ struct __4th_helper<_T1, _Rp, true>
template <class _Rp, class _Tp, class _T1>
inline _LIBCPP_INLINE_VISIBILITY
typename __4th_helper<_T1, _Rp,
!is_base_of<_Tp,
typename remove_reference<_T1>::type
>::value
>::type&
is_member_object_pointer<_Rp _Tp::*>::value &&
!is_base_of<_Tp, typename remove_reference<_T1>::type>::value
>::type&
__invoke(_Rp _Tp::* __f, _T1& __t1)
{
return (*__t1).*__f;
@ -494,20 +488,20 @@ struct __invoke_return<_Fp, false>
typedef decltype(__invoke(_VSTD::declval<_Fp&>())) type;
};
template <class _Tp, class _A0>
template <class _Tp, class _A0, bool = is_member_object_pointer<_Tp>::value>
struct __invoke_return0
{
typedef decltype(__invoke(_VSTD::declval<_Tp&>(), _VSTD::declval<_A0&>())) type;
};
template <class _Rp, class _Tp, class _A0>
struct __invoke_return0<_Rp _Tp::*, _A0>
struct __invoke_return0<_Rp _Tp::*, _A0, true>
{
typedef typename __apply_cv<_A0, _Rp>::type& type;
};
template <class _Rp, class _Tp, class _A0>
struct __invoke_return0<_Rp _Tp::*, _A0*>
struct __invoke_return0<_Rp _Tp::*, _A0*, true>
{
typedef typename __apply_cv<_A0, _Rp>::type& type;
};

4
libcxx/include/functional
View File

@ -1260,10 +1260,6 @@ public:
return __invoke(__f_, _VSTD::forward<_ArgTypes>(__args)...);
}
#else
typename __invoke_return<type>::type
operator() () const {
return __invoke(__f_);
}
template <class _A0>
typename __invoke_return0<type, _A0>::type