Implement deduction guides for basic_regex
llvm-svn: 333050
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: edd5e29cfe9f67ec8e7e0eda12eb05e616fdeebc
diff --git a/include/regex b/include/regex
index ed0781c..612fa84 100644
--- a/include/regex
+++ b/include/regex
@@ -192,6 +192,11 @@
void swap(basic_regex&);
};
+template<class ForwardIterator>
+basic_regex(ForwardIterator, ForwardIterator,
+ regex_constants::syntax_option_type = regex_constants::ECMAScript)
+ -> basic_regex<typename iterator_traits<ForwardIterator>::value_type>; // C++17
+
typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;
@@ -2922,6 +2927,15 @@
template <class, class> friend class __lookahead;
};
+#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
+template <class _ForwardIterator,
+ class = typename enable_if<__is_forward_iterator<_ForwardIterator>::value, nullptr_t>::type
+>
+basic_regex(_ForwardIterator, _ForwardIterator,
+ regex_constants::syntax_option_type = regex_constants::ECMAScript)
+ -> basic_regex<typename iterator_traits<_ForwardIterator>::value_type>;
+#endif
+
template <class _CharT, class _Traits>
const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::icase;
template <class _CharT, class _Traits>