@@ -1283,7 +1283,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
&& !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
&& __is_pointer<_II1>::__value
&& __is_pointer<_II2>::__value
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && __cpp_lib_concepts
// For C++20 iterator_traits<volatile T*>::value_type is non-volatile
// so __is_byte<T> could be true, but we can't use memcmp with
// volatile data.
@@ -77,7 +77,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_ok(__obj._M_ok)
{ }
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && __cpp_lib_concepts
constexpr
istream_iterator(default_sentinel_t)
noexcept(is_nothrow_default_constructible_v<_Tp>)
@@ -153,7 +153,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
operator!=(const istream_iterator& __x, const istream_iterator& __y)
{ return !__x._M_equal(__y); }
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && __cpp_lib_concepts
friend bool
operator==(const istream_iterator& __i, default_sentinel_t)
{ return !__i._M_stream; }
@@ -115,7 +115,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
: _M_sbuf(0), _M_c(traits_type::eof()) { }
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && __cpp_lib_concepts
constexpr istreambuf_iterator(default_sentinel_t) noexcept
: istreambuf_iterator() { }
#endif
@@ -215,7 +215,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return traits_type::eq_int_type(__c, __eof);
}
-#if __cplusplus > 201703L
+#if __cplusplus > 201703L && __cpp_lib_concepts
friend bool
operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
{ return __i._M_at_eof(); }