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diff --git a/include/math.h b/include/math.h
index 5bde46a..33bf0eb 100644
--- a/include/math.h
+++ b/include/math.h
@@ -326,7 +326,7 @@ extern "C++" {
# undef isinf
# endif
-# ifdef isnan
+# if defined(isnan) && !defined(_LIBCPP_MSVCRT)
# undef isnan
# endif
diff --git a/include/string b/include/string
index 123e1d6..57624c7 100644
--- a/include/string
+++ b/include/string
@@ -703,6 +703,7 @@ struct __init_with_sentinel_tag {};
template<class _CharT, class _Traits, class _Allocator>
class basic_string
{
+ static_assert(sizeof(_CharT) <= 4, "libc++ implementation of std::basic_string does not support extra-wide character types");
public:
typedef basic_string __self;
typedef basic_string_view<_CharT, _Traits> __self_view;
@@ -947,9 +948,11 @@ public:
__init(__s, traits_type::length(__s));
}
-#if _LIBCPP_STD_VER >= 23
+#if _LIBCPP_STD_VER >= 20
basic_string(nullptr_t) = delete;
#endif
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+ basic_string(nullptr_t, size_t) = delete;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, size_type __n)
: __r_(__default_init_tag(), __default_init_tag()) {
@@ -957,6 +960,9 @@ public:
__init(__s, __n);
}
+ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+ basic_string(nullptr_t, size_t, const _Allocator&) = delete;
+
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
basic_string(const _CharT* __s, size_type __n, const _Allocator& __a)
: __r_(__default_init_tag(), __a) {
@@ -1120,7 +1126,7 @@ public:
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
basic_string& operator=(const value_type* __s) {return assign(__s);}
-#if _LIBCPP_STD_VER >= 23
+#if _LIBCPP_STD_VER >= 20
basic_string& operator=(nullptr_t) = delete;
#endif
_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(value_type __c);
@@ -1182,6 +1188,13 @@ public:
return (__is_long() ? __get_long_cap() : static_cast<size_type>(__min_cap)) - 1;
}
+#if _YNDX_LIBCXX_ENABLE_STRING_RESIZE_UNINITIALIZED == 1
+ inline void resize_uninitialized(size_type __n)
+ {
+ __resize_default_init(__n);
+ }
+#endif
+
_LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n, value_type __c);
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n) { resize(__n, value_type()); }
@@ -1701,7 +1714,7 @@ public:
{ return ends_with(__self_view(__s)); }
#endif
-#if _LIBCPP_STD_VER >= 23
+#if _LIBCPP_STD_VER >= 20
constexpr _LIBCPP_HIDE_FROM_ABI
bool contains(__self_view __sv) const noexcept
{ return __self_view(data(), size()).contains(__sv); }
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