[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!
llvm-svn: 277968
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 2fdf202493fcef9a3cf7c1b14843090d9eef2539
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);}