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Ensure bitset's string constructor doesn't poison the overload set. 

llvm-svn: 364842
This commit is contained in:
Eric Fiselier 2019-07-01 19:59:34 +00:00
parent c9f14f29f5
commit d1523f7a8c
3 changed files with 19 additions and 2 deletions
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4
libcxx/include/bitset
View File

@ -679,7 +679,7 @@ public:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bitset() _NOEXCEPT {}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
bitset(unsigned long long __v) _NOEXCEPT : base(__v) {}
template<class _CharT>
template<class _CharT, class = _EnableIf<_IsCharLikeType<_CharT>::value> >
explicit bitset(const _CharT* __str,
typename basic_string<_CharT>::size_type __n = basic_string<_CharT>::npos,
_CharT __zero = _CharT('0'), _CharT __one = _CharT('1'));
@ -760,7 +760,7 @@ private:
};
template <size_t _Size>
template<class _CharT>
template<class _CharT, class>
bitset<_Size>::bitset(const _CharT* __str,
typename basic_string<_CharT>::size_type __n,
_CharT __zero, _CharT __one)

4
libcxx/include/type_traits
View File

@ -4006,6 +4006,10 @@ inline constexpr bool is_constant_evaluated() noexcept {
}
#endif
template <class _CharT>
using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >;
_LIBCPP_END_NAMESPACE_STD
#if _LIBCPP_STD_VER > 14

13
libcxx/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
View File

@ -74,6 +74,18 @@ void test_string_ctor()
}
}
struct Nonsense {
virtual ~Nonsense() {}
};
void test_for_non_eager_instantiation() {
// Ensure we don't accidentally instantiate `std::basic_string<Nonsense>`
// since it may not be well formed and can cause an error in the
// non-immediate context.
static_assert(!std::is_constructible<std::bitset<3>, Nonsense*>::value, "");
static_assert(!std::is_constructible<std::bitset<3>, Nonsense*, size_t, Nonsense&, Nonsense&>::value, "");
}
int main(int, char**)
{
test_string_ctor<0>();
@ -85,6 +97,7 @@ int main(int, char**)
test_string_ctor<64>();
test_string_ctor<65>();
test_string_ctor<1000>();
test_for_non_eager_instantiation();
return 0;
}