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Qualify an internal call in is_assignable to prevent ADL lookup, which would 'complete' an type definition unnecessarily. Thanks to Richard Smith for the report.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@234886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow 2015-04-14 13:53:53 +00:00
parent 66302c650b
commit 3a4964aef3
2 changed files with 7 additions and 1 deletions
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2
include/type_traits
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@ -1533,7 +1533,7 @@ template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::va
struct __is_assignable_imp
: public common_type
<
decltype(__is_assignable_test(declval<_Tp>(), declval<_Arg>()))
decltype(_VSTD::__is_assignable_test(declval<_Tp>(), declval<_Arg>()))
>::type {};
template <class _Tp, class _Arg>

6
test/std/utilities/meta/meta.unary/meta.unary.prop/is_assignable.pass.cpp
View File

@ -49,6 +49,9 @@ struct E
};
#endif
template <typename T>
struct X { T t; };
int main()
{
test_is_assignable<int&, int&> ();
@ -67,4 +70,7 @@ int main()
test_is_not_assignable<void, const void> ();
test_is_not_assignable<const void, const void> ();
test_is_not_assignable<int(), int> ();
// pointer to incomplete template type
test_is_assignable<X<D>*&, X<D>*> ();
}