libstdc++: Add noexcept to functions in <regex>

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/regex.h (basic_regex, swap): Add noexcept to
	non-throwing functions.
	* include/bits/regex_automaton.h (_State_base, _State)
	(_NFA_base): Likewise.
	* include/bits/regex_compiler.h (_Compiler): Likewise.
	* include/bits/regex_error.h (regex_error::code()): Likewise.
	* include/bits/regex_scanner.h (_Scanner): Likewise.

libstdc++-v3/include/bits/regex.h

@@ -421,7 +421,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        * Constructs a basic regular expression that does not match any
        * character sequence.
        */
-      basic_regex()
+      basic_regex() noexcept
       : _M_flags(ECMAScript), _M_loc(), _M_automaton(nullptr)
       { }
 
@@ -697,7 +697,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        * expression.
        */
       unsigned int
-      mark_count() const
+      mark_count() const noexcept
       {
 	if (_M_automaton)
 	  return _M_automaton->_M_sub_count() - 1;
@@ -709,7 +709,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        * or in the last call to assign().
        */
       flag_type
-      flags() const
+      flags() const noexcept
       { return _M_flags; }
 
       // [7.8.5] locale
@@ -731,7 +731,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *        object.
        */
       locale_type
-      getloc() const
+      getloc() const noexcept
       { return _M_loc; }
 
       // [7.8.6] swap
@@ -741,7 +741,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        * @param __rhs Another regular expression object.
        */
       void
-      swap(basic_regex& __rhs)
+      swap(basic_regex& __rhs) noexcept
       {
 	std::swap(_M_flags, __rhs._M_flags);
 	std::swap(_M_loc, __rhs._M_loc);
@@ -848,7 +848,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
   template<typename _Ch_type, typename _Rx_traits>
     inline void
     swap(basic_regex<_Ch_type, _Rx_traits>& __lhs,
-	 basic_regex<_Ch_type, _Rx_traits>& __rhs)
+	 basic_regex<_Ch_type, _Rx_traits>& __rhs) noexcept
     { __lhs.swap(__rhs); }
 
 

libstdc++-v3/include/bits/regex_automaton.h

@@ -95,13 +95,13 @@ namespace __detail
     };
 
   protected:
-    explicit _State_base(_Opcode __opcode)
+    explicit _State_base(_Opcode __opcode) noexcept
     : _M_opcode(__opcode), _M_next(_S_invalid_state_id)
     { }
 
   public:
     bool
-    _M_has_alt()
+    _M_has_alt() const noexcept
     {
       return _M_opcode == _S_opcode_alternative
 	|| _M_opcode == _S_opcode_repeat
@@ -130,7 +130,7 @@ namespace __detail
 		    "std::function<bool(char)>");
 
       explicit
-      _State(_Opcode __opcode) : _State_base(__opcode)
+      _State(_Opcode __opcode) noexcept : _State_base(__opcode)
       {
 	if (_M_opcode() == _S_opcode_match)
 	  new (this->_M_matcher_storage._M_addr()) _MatcherT();
@@ -143,7 +143,7 @@ namespace __detail
 	    _MatcherT(__rhs._M_get_matcher());
       }
 
-      _State(_State&& __rhs) : _State_base(__rhs)
+      _State(_State&& __rhs) noexcept : _State_base(__rhs)
       {
 	if (__rhs._M_opcode() == _S_opcode_match)
 	  new (this->_M_matcher_storage._M_addr())
@@ -162,7 +162,7 @@ namespace __detail
       // Since correct ctor and dtor rely on _M_opcode, it's better not to
       // change it over time.
       _Opcode
-      _M_opcode() const
+      _M_opcode() const noexcept
       { return _State_base::_M_opcode; }
 
       bool
@@ -170,11 +170,11 @@ namespace __detail
       { return _M_get_matcher()(__char); }
 
       _MatcherT&
-      _M_get_matcher()
+      _M_get_matcher() noexcept
       { return *static_cast<_MatcherT*>(this->_M_matcher_storage._M_addr()); }
 
       const _MatcherT&
-      _M_get_matcher() const
+      _M_get_matcher() const noexcept
       {
 	return *static_cast<const _MatcherT*>(
 	    this->_M_matcher_storage._M_addr());
@@ -187,7 +187,7 @@ namespace __detail
     typedef regex_constants::syntax_option_type _FlagT;
 
     explicit
-    _NFA_base(_FlagT __f)
+    _NFA_base(_FlagT __f) noexcept
     : _M_flags(__f), _M_start_state(0), _M_subexpr_count(0),
     _M_has_backref(false)
     { }
@@ -199,15 +199,15 @@ namespace __detail
 
   public:
     _FlagT
-    _M_options() const
+    _M_options() const noexcept
     { return _M_flags; }
 
     _StateIdT
-    _M_start() const
+    _M_start() const noexcept
     { return _M_start_state; }
 
     _SizeT
-    _M_sub_count() const
+    _M_sub_count() const noexcept
     { return _M_subexpr_count; }
 
     _GLIBCXX_STD_C::vector<size_t> _M_paren_stack;

libstdc++-v3/include/bits/regex_compiler.h

@@ -66,7 +66,7 @@ namespace __detail
 		const typename _TraitsT::locale_type& __traits, _FlagT __flags);
 
       shared_ptr<const _RegexT>
-      _M_get_nfa()
+      _M_get_nfa() noexcept
       { return std::move(_M_nfa); }
 
     private:

libstdc++-v3/include/bits/regex_error.h

@@ -150,7 +150,7 @@ namespace regex_constants
      * @returns the regex error code.
      */
     regex_constants::error_type
-    code() const
+    code() const noexcept
     { return _M_code; }
 
   private:

libstdc++-v3/include/bits/regex_scanner.h

@@ -223,11 +223,11 @@ namespace __detail
       _M_advance();
 
       _TokenT
-      _M_get_token() const
+      _M_get_token() const noexcept
       { return _M_token; }
 
       const _StringT&
-      _M_get_value() const
+      _M_get_value() const noexcept
       { return _M_value; }
 
 #ifdef _GLIBCXX_DEBUG