[committed] libstdc++: Initialize member in std::match_results [PR103549]

[Jonathan Wakely via Gcc-patches]

Tested powerpc64le-linux, pushed to trunk.


This fixes a -Wuninitialized warning for std::cmatch m1, m2; m1=m2;

Also name the template parameters in the forward declaration, to get rid
of the <template-parameter-1-1> noise in diagnostics.

libstdc++-v3/ChangeLog:

        PR libstdc++/103549
        * include/bits/regex.h (match_results): Give names to template
        parameters in first declaration.
        (match_results::_M_begin): Add default member-initializer.
---
 libstdc++-v3/include/bits/regex.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/bits/regex.h 
b/libstdc++-v3/include/bits/regex.h
index 785edc71800..52dcd7f86ae 100644
--- a/libstdc++-v3/include/bits/regex.h
+++ b/libstdc++-v3/include/bits/regex.h
@@ -35,7 +35,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
   template<typename, typename>
     class basic_regex;
 
-  template<typename, typename>
+  template<typename _Bi_iter, typename _Alloc>
     class match_results;
 
 _GLIBCXX_END_NAMESPACE_CXX11
@@ -2109,7 +2109,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _M_suffix()
       { return _Unchecked::operator[](_Unchecked::size() - 1); }
 
-      _Bi_iter _M_begin;
+      _Bi_iter _M_begin {};
       /// @endcond
     };
 
-- 
2.31.1