[libcxx] Add "flag" default arg: basic_regex ptr_size_flag ctor Summary: The synopsis in C++11 subclause 28.8 [re.regex] has: ``` basic_regex(const charT* p, size_t len, flag_type f = regex_constants::ECMAScript); ``` The default argument is added to libc++ by this change. Reviewers: mclow.lists, rsmith, hubert.reinterpretcast Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D22702 Reapplies r277966. Patch by Jason Liu! git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@277968 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/include/regex b/include/regex index b223e63..42f3dbb 100644 --- a/include/regex +++ b/include/regex 
@@ -147,7 +147,7 @@  // construct/copy/destroy:  basic_regex();  explicit basic_regex(const charT* p, flag_type f = regex_constants::ECMAScript); - basic_regex(const charT* p, size_t len, flag_type f); + basic_regex(const charT* p, size_t len, flag_type f = regex_constants::ECMAScript);  basic_regex(const basic_regex&);  basic_regex(basic_regex&&) noexcept;  template <class ST, class SA> @@ -2519,7 +2519,7 @@  __end_(0)  {__parse(__p, __p + __traits_.length(__p));}  _LIBCPP_INLINE_VISIBILITY - basic_regex(const value_type* __p, size_t __len, flag_type __f) + basic_regex(const value_type* __p, size_t __len, flag_type __f = regex_constants::ECMAScript)  : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),  __end_(0)  {__parse(__p, __p + __len);}