commit c44c5f3d9f46705a262911c2098c1568d7e8ac2d
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Sep 28 13:39:36 2021

    libstdc++: Remove obfuscating typedefs in <regex>
    
    There is no benefit to using _SizeT instead of size_t, and IterT tells
    you less about the type than const _CharT*. This removes some unhelpful
    typedefs.
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/regex_automaton.h (_NFA_base::_SizeT): Remove.
            * include/bits/regex_compiler.h (_Compiler::_IterT): Remove.
            * include/bits/regex_compiler.tcc: Likewise.
            * include/bits/regex_scanner.h (_Scanner::_IterT): Remove.
            * include/bits/regex_scanner.tcc: Likewise.

diff --git a/libstdc++-v3/include/bits/regex_automaton.h b/libstdc++-v3/include/bits/regex_automaton.h
index 02d81f3e417..f108675f35e 100644
--- a/libstdc++-v3/include/bits/regex_automaton.h
+++ b/libstdc++-v3/include/bits/regex_automaton.h
@@ -183,7 +183,6 @@ namespace __detail
 
   struct _NFA_base
   {
-    typedef size_t                              _SizeT;
     typedef regex_constants::syntax_option_type _FlagT;
 
     explicit
@@ -206,14 +205,14 @@ namespace __detail
     _M_start() const noexcept
     { return _M_start_state; }
 
-    _SizeT
+    size_t
     _M_sub_count() const noexcept
     { return _M_subexpr_count; }
 
     _GLIBCXX_STD_C::vector<size_t> _M_paren_stack;
     _FlagT                    _M_flags;
     _StateIdT                 _M_start_state;
-    _SizeT                    _M_subexpr_count;
+    size_t                    _M_subexpr_count;
     bool                      _M_has_backref;
   };
 
diff --git a/libstdc++-v3/include/bits/regex_compiler.h b/libstdc++-v3/include/bits/regex_compiler.h
index 423ab823194..646766ebdf9 100644
--- a/libstdc++-v3/include/bits/regex_compiler.h
+++ b/libstdc++-v3/include/bits/regex_compiler.h
@@ -58,11 +58,10 @@ namespace __detail
     {
     public:
       typedef typename _TraitsT::char_type        _CharT;
-      typedef const _CharT*                       _IterT;
       typedef _NFA<_TraitsT>              	  _RegexT;
       typedef regex_constants::syntax_option_type _FlagT;
 
-      _Compiler(_IterT __b, _IterT __e,
+      _Compiler(const _CharT* __b, const _CharT* __e,
 		const typename _TraitsT::locale_type& __traits, _FlagT __flags);
 
       shared_ptr<const _RegexT>
diff --git a/libstdc++-v3/include/bits/regex_compiler.tcc b/libstdc++-v3/include/bits/regex_compiler.tcc
index 9f04c1be686..1bd30972cbb 100644
--- a/libstdc++-v3/include/bits/regex_compiler.tcc
+++ b/libstdc++-v3/include/bits/regex_compiler.tcc
@@ -63,7 +63,7 @@ namespace __detail
 {
   template<typename _TraitsT>
     _Compiler<_TraitsT>::
-    _Compiler(_IterT __b, _IterT __e,
+    _Compiler(const _CharT* __b, const _CharT* __e,
 	      const typename _TraitsT::locale_type& __loc, _FlagT __flags)
     : _M_flags((__flags
 		& (regex_constants::ECMAScript
diff --git a/libstdc++-v3/include/bits/regex_scanner.h b/libstdc++-v3/include/bits/regex_scanner.h
index 05d8172a0ad..4e7d5efb34b 100644
--- a/libstdc++-v3/include/bits/regex_scanner.h
+++ b/libstdc++-v3/include/bits/regex_scanner.h
@@ -211,12 +211,11 @@ namespace __detail
     : public _ScannerBase
     {
     public:
-      typedef const _CharT*                                       _IterT;
       typedef std::basic_string<_CharT>                           _StringT;
       typedef regex_constants::syntax_option_type                 _FlagT;
       typedef const std::ctype<_CharT>                            _CtypeT;
 
-      _Scanner(_IterT __begin, _IterT __end,
+      _Scanner(const _CharT* __begin, const _CharT* __end,
 	       _FlagT __flags, std::locale __loc);
 
       void
@@ -257,8 +256,8 @@ namespace __detail
       void
       _M_eat_class(char);
 
-      _IterT                        _M_current;
-      _IterT                        _M_end;
+      const _CharT*                 _M_current;
+      const _CharT*                 _M_end;
       _CtypeT&                      _M_ctype;
       _StringT                      _M_value;
       void (_Scanner::* _M_eat_escape)();
diff --git a/libstdc++-v3/include/bits/regex_scanner.tcc b/libstdc++-v3/include/bits/regex_scanner.tcc
index a9d6a613648..b2b709ce3cb 100644
--- a/libstdc++-v3/include/bits/regex_scanner.tcc
+++ b/libstdc++-v3/include/bits/regex_scanner.tcc
@@ -54,8 +54,7 @@ namespace __detail
 {
   template<typename _CharT>
     _Scanner<_CharT>::
-    _Scanner(typename _Scanner::_IterT __begin,
-	     typename _Scanner::_IterT __end,
+    _Scanner(const _CharT* __begin, const _CharT* __end,
 	     _FlagT __flags, std::locale __loc)
     : _ScannerBase(__flags),
       _M_current(__begin), _M_end(__end),