vstring.h (__versa_string<>::operator+, [...]): Move out of line...

2005-12-04  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/vstring.h (__versa_string<>::operator+, all
	versions): Move out of line...
	* include/ext/vstring.tcc (__versa_string<>::operator+): ...
	here; consistently use reserve for the benefit of sso_string_base;
	prefer push_back to single-char append when appropriate.

	* include/ext/vstring.h (__versa_string<>::push_back): Don't
	call _M_reserve, _M_mutate instead.
	(reserve): Just forward to _M_reserve.
	* include/ext/vstring.tcc (__versa_string<>::_M_reserve): Remove.
	* include/ext/rc_string_base.h (__rc_string_base<>::_M_reserve): Also
	do the initial checks (first on length, in case __res == capacity).
	* include/ext/sso_string_base.h (__sso_string_base<>::_M_reserve:
	Likewise; don't call _M_set_length unnecessarily.

2005-12-04  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/vstring.h (__versa_string<>::_M_append): New.
	(append(const __versa_string&), append(const __versa_string&,
	size_type, size_type), append(const _CharT*, size_type),
	append(const _CharT*)): Use it.
	(append(size_type, _CharT)): Delegate to _M_replace_aux.
	(assign(const __versa_string&, size_type, size_type),
	assign(const _CharT*), replace(size_type, size_type,
	const _CharT*, size_type)): Forward to _M_replace.
	* include/ext/vstring.tcc (__versa_string<>::_M_append):
	Define, core append functionality.
	(_M_replace): Simplify, move __s == 0 case to _M_replace_aux.
	(_M_replace_aux): Reorganize, don't call _M_replace.

2005-12-04  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/vstring.tcc (__versa_string<>::_M_replace):
	Perform _M_check_length at the beginning and remove it from ...
	(replace, _M_replace_dispatch, _M_replace_aux, assign): ... here.
	(assign): Now move inline.
	(resize): Don't call _M_check_length redundantly, append does.

2005-12-04  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/sso_string_base.h (__sso_string_base<>::_M_get_allocator):
	Add non const version.
	* include/ext/rc_string_base.h (__rc_string_base<>::_M_get_allocator):
	Likewise.
	
	* include/ext/sso_string_base.h (__sso_string_base<>::_M_erase): Add.
	* include/ext/rc_string_base.h (__rc_string_base<>::_M_erase): Likewise.
	(_M_leak_hard): Use it.
	* include/ext/vstring.h (__versa_string<>::clear, erase, all
	versions): Use it.
	* include/ext/vstring.tcc (__versa_string<>::resize): Likewise.

	* include/ext/vstring.h (__versa_string<>::_M_replace_safe):
	Remove.
	* include/ext/vstring.h (__versa_string<>::_M_replace): New, does
	the in-place work or delegates to _M_mutate in case of reallocation.
	* include/ext/vstring.tcc (__versa_string<>::_M_replace_safe):
	Remove.
	* include/ext/vstring.tcc (__versa_string<>::_M_replace): Define.
	(assign, replace, _M_replace_dispatch, _M_replace_aux): Use it.
	* include/ext/sso_string_base.h (__sso_string_base<>::_M_mutate):
	Change to manage only reallocations.
	* include/ext/rc_string_base.h (__rc_string_base<>::_M_mutate):
	Likewise.

	* include/ext/vstring.h (__versa_string<>::insert(size_type,
	const __versa_string&), insert(size_type, const __versa_string&,
	size_type, size_type), insert(size_type, const _CharT*, size_type),
	insert(size_type, const _CharT*)): Delegate to replace.

	* include/ext/vstring.h (__versa_string<>::reserve): Move out of
	line.
	* include/ext/vstring.tcc (__versa_string<>::reserve): Do the
	checks and call _M_reserve.
	* include/ext/vstring.h (__versa_string<>::append): Call _M_reserve
	instead of reserve.
	* include/ext/vstring.tcc (__versa_string<>::append, all versions):
	Likewise.
	* include/ext/sso_string_base.h (__sso_string_base<>::_M_reserve):
	Adjust.
	* include/ext/rc_string_base.h (__rc_string_base<>::_M_reserve):
	Likewise.

From-SVN: r108034

5 files changed, 374 insertions, 301 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index de206f6..3dcd4d8 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,88 @@
+2005-12-04  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/ext/vstring.h (__versa_string<>::operator+, all
+	versions): Move out of line...
+	* include/ext/vstring.tcc (__versa_string<>::operator+): ...
+	here; consistently use reserve for the benefit of sso_string_base;
+	prefer push_back to single-char append when appropriate.
+
+	* include/ext/vstring.h (__versa_string<>::push_back): Don't
+	call _M_reserve, _M_mutate instead.
+	(reserve): Just forward to _M_reserve.
+	* include/ext/vstring.tcc (__versa_string<>::_M_reserve): Remove.
+	* include/ext/rc_string_base.h (__rc_string_base<>::_M_reserve): Also
+	do the initial checks (first on length, in case __res == capacity).
+	* include/ext/sso_string_base.h (__sso_string_base<>::_M_reserve:
+	Likewise; don't call _M_set_length unnecessarily.
+
+2005-12-04  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/ext/vstring.h (__versa_string<>::_M_append): New.
+	(append(const __versa_string&), append(const __versa_string&,
+	size_type, size_type), append(const _CharT*, size_type),
+	append(const _CharT*)): Use it.
+	(append(size_type, _CharT)): Delegate to _M_replace_aux.
+	(assign(const __versa_string&, size_type, size_type),
+	assign(const _CharT*), replace(size_type, size_type,
+	const _CharT*, size_type)): Forward to _M_replace.
+	* include/ext/vstring.tcc (__versa_string<>::_M_append):
+	Define, core append functionality.
+	(_M_replace): Simplify, move __s == 0 case to _M_replace_aux.
+	(_M_replace_aux): Reorganize, don't call _M_replace.
+
+2005-12-04  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/ext/vstring.tcc (__versa_string<>::_M_replace):
+	Perform _M_check_length at the beginning and remove it from ...
+	(replace, _M_replace_dispatch, _M_replace_aux, assign): ... here.
+	(assign): Now move inline.
+	(resize): Don't call _M_check_length redundantly, append does.
+
+2005-12-04  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/ext/sso_string_base.h (__sso_string_base<>::_M_get_allocator):
+	Add non const version.
+	* include/ext/rc_string_base.h (__rc_string_base<>::_M_get_allocator):
+	Likewise.
+	
+	* include/ext/sso_string_base.h (__sso_string_base<>::_M_erase): Add.
+	* include/ext/rc_string_base.h (__rc_string_base<>::_M_erase): Likewise.
+	(_M_leak_hard): Use it.
+	* include/ext/vstring.h (__versa_string<>::clear, erase, all
+	versions): Use it.
+	* include/ext/vstring.tcc (__versa_string<>::resize): Likewise.
+
+	* include/ext/vstring.h (__versa_string<>::_M_replace_safe):
+	Remove.
+	* include/ext/vstring.h (__versa_string<>::_M_replace): New, does
+	the in-place work or delegates to _M_mutate in case of reallocation.
+	* include/ext/vstring.tcc (__versa_string<>::_M_replace_safe):
+	Remove.
+	* include/ext/vstring.tcc (__versa_string<>::_M_replace): Define.
+	(assign, replace, _M_replace_dispatch, _M_replace_aux): Use it.
+	* include/ext/sso_string_base.h (__sso_string_base<>::_M_mutate):
+	Change to manage only reallocations.
+	* include/ext/rc_string_base.h (__rc_string_base<>::_M_mutate):
+	Likewise.
+
+	* include/ext/vstring.h (__versa_string<>::insert(size_type,
+	const __versa_string&), insert(size_type, const __versa_string&,
+	size_type, size_type), insert(size_type, const _CharT*, size_type),
+	insert(size_type, const _CharT*)): Delegate to replace.
+
+	* include/ext/vstring.h (__versa_string<>::reserve): Move out of
+	line.
+	* include/ext/vstring.tcc (__versa_string<>::reserve): Do the
+	checks and call _M_reserve.
+	* include/ext/vstring.h (__versa_string<>::append): Call _M_reserve
+	instead of reserve.
+	* include/ext/vstring.tcc (__versa_string<>::append, all versions):
+	Likewise.
+	* include/ext/sso_string_base.h (__sso_string_base<>::_M_reserve):
+	Adjust.
+	* include/ext/rc_string_base.h (__rc_string_base<>::_M_reserve):
+	Likewise.
+
 2005-12-02  David Billinghurst (David.Billinghurst@riotinto.com)
 
 	PR testsuite/25193
diff --git a/libstdc++-v3/include/ext/rc_string_base.h b/libstdc++-v3/include/ext/rc_string_base.h
index 8fb7531..9636a81 100644
--- a/libstdc++-v3/include/ext/rc_string_base.h
+++ b/libstdc++-v3/include/ext/rc_string_base.h
@@ -311,6 +311,10 @@ namespace __gnu_cxx
       ~__rc_string_base()
       { _M_dispose(); }      
 
+      allocator_type&
+      _M_get_allocator()
+      { return _M_dataplus; }
+
       const allocator_type&
       _M_get_allocator() const
       { return _M_dataplus; }
@@ -325,7 +329,11 @@ namespace __gnu_cxx
       _M_reserve(size_type __res);
 
       void
-      _M_mutate(size_type __pos, size_type __len1, size_type __len2);
+      _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
+		size_type __len2);
+      
+      void
+      _M_erase(size_type __pos, size_type __n);
     };
 
   template<typename _CharT, typename _Traits, typename _Alloc>
@@ -377,8 +385,8 @@ namespace __gnu_cxx
 
       // NB: Need an array of char_type[__capacity], plus a terminating
       // null char_type() element, plus enough for the _Rep data structure,
-      // plus sizeof(size_type) - 1 to upper round to a size multiple
-      // of sizeof(size_type).
+      // plus sizeof(_Rep) - 1 to upper round to a size multiple of
+      // sizeof(_Rep).
       // Whew. Seemingly so needy, yet so elemental.
       size_type __size = ((__capacity + 1) * sizeof(_CharT)
 			  + 2 * sizeof(_Rep) - 1);
@@ -458,7 +466,7 @@ namespace __gnu_cxx
     _M_leak_hard()
     {
       if (_M_is_shared())
-	_M_mutate(0, 0, 0);
+	_M_erase(0, 0);
       _M_set_leaked();
     }
 
@@ -490,7 +498,7 @@ namespace __gnu_cxx
 	  {
 	    while (__beg != __end)
 	      {
-		if (__len == __r->_M_capacity)
+		if (__len == __r->_M_info._M_capacity)
 		  {
 		    // Allocate more space.
 		    _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
@@ -594,12 +602,12 @@ namespace __gnu_cxx
     __rc_string_base<_CharT, _Traits, _Alloc>::
     _M_reserve(size_type __res)
     {
+      // Make sure we don't shrink below the current size.
+      if (__res < _M_length())
+	__res = _M_length();
+      
       if (__res != _M_capacity() || _M_is_shared())
 	{
-	  // Make sure we don't shrink below the current size.
-	  if (__res < _M_length())
-	    __res = _M_length();
-	  
 	  _CharT* __tmp = _M_rep()->_M_clone(_M_get_allocator(),
 					     __res - _M_length());
 	  _M_dispose();
@@ -610,13 +618,35 @@ namespace __gnu_cxx
   template<typename _CharT, typename _Traits, typename _Alloc>
     void
     __rc_string_base<_CharT, _Traits, _Alloc>::
-    _M_mutate(size_type __pos, size_type __len1, size_type __len2)
+    _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
+	      size_type __len2)
     {
-      const size_type __old_size = _M_length();
-      const size_type __new_size = __old_size + __len2 - __len1;
-      const size_type __how_much = __old_size - __pos - __len1;
+      const size_type __how_much = _M_length() - __pos - __len1;
+      
+      _Rep* __r = _Rep::_S_create(_M_length() + __len2 - __len1,
+				  _M_capacity(), _M_get_allocator());
       
-      if (__new_size > _M_capacity() || _M_is_shared())
+      if (__pos)
+	_S_copy(__r->_M_refdata(), _M_data(), __pos);
+      if (__s && __len2)
+	_S_copy(__r->_M_refdata() + __pos, __s, __len2);
+      if (__how_much)
+	_S_copy(__r->_M_refdata() + __pos + __len2,
+		_M_data() + __pos + __len1, __how_much);
+      
+      _M_dispose();
+      _M_data(__r->_M_refdata());
+    }
+
+  template<typename _CharT, typename _Traits, typename _Alloc>
+    void
+    __rc_string_base<_CharT, _Traits, _Alloc>::
+    _M_erase(size_type __pos, size_type __n)
+    {
+      const size_type __new_size = _M_length() - __n;
+      const size_type __how_much = _M_length() - __pos - __n;
+      
+      if (_M_is_shared())
 	{
 	  // Must reallocate.
 	  _Rep* __r = _Rep::_S_create(__new_size, _M_capacity(),
@@ -625,19 +655,20 @@ namespace __gnu_cxx
 	  if (__pos)
 	    _S_copy(__r->_M_refdata(), _M_data(), __pos);
 	  if (__how_much)
-	    _S_copy(__r->_M_refdata() + __pos + __len2,
-		    _M_data() + __pos + __len1, __how_much);
+	    _S_copy(__r->_M_refdata() + __pos,
+		    _M_data() + __pos + __n, __how_much);
 
 	  _M_dispose();
 	  _M_data(__r->_M_refdata());
 	}
-      else if (__how_much && __len1 != __len2)
+      else if (__how_much && __n)
 	{
 	  // Work in-place.
-	  _S_move(_M_data() + __pos + __len2,
-		  _M_data() + __pos + __len1, __how_much);
+	  _S_move(_M_data() + __pos,
+		  _M_data() + __pos + __n, __how_much);
 	}
-      _M_rep()->_M_set_length(__new_size);
+
+      _M_rep()->_M_set_length(__new_size);      
     }
 } // namespace __gnu_cxx
 
diff --git a/libstdc++-v3/include/ext/sso_string_base.h b/libstdc++-v3/include/ext/sso_string_base.h
index f4bd3fb..e552a57 100644
--- a/libstdc++-v3/include/ext/sso_string_base.h
+++ b/libstdc++-v3/include/ext/sso_string_base.h
@@ -202,6 +202,10 @@ namespace __gnu_cxx
       ~__sso_string_base()
       { _M_dispose(); }
 
+      allocator_type&
+      _M_get_allocator()
+      { return _M_dataplus; }
+
       const allocator_type&
       _M_get_allocator() const
       { return _M_dataplus; }
@@ -216,7 +220,11 @@ namespace __gnu_cxx
       _M_reserve(size_type __res);
 
       void
-      _M_mutate(size_type __pos, size_type __len1, size_type __len2);
+      _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
+		size_type __len2);
+
+      void
+      _M_erase(size_type __pos, size_type __n);
     };
 
   template<typename _CharT, typename _Traits, typename _Alloc>
@@ -471,19 +479,18 @@ namespace __gnu_cxx
     __sso_string_base<_CharT, _Traits, _Alloc>::
     _M_reserve(size_type __res)
     {
+      // Make sure we don't shrink below the current size.
+      if (__res < _M_length())
+	__res = _M_length();
+
       const size_type __capacity = _M_capacity();
       if (__res != __capacity)
 	{
-	  // Make sure we don't shrink below the current size.
-	  if (__res < _M_length())
-	    __res = _M_length();
-
 	  if (__res > __capacity
 	      || __res > size_type(_S_local_capacity))
 	    {
 	      _CharT* __tmp = _M_create(__res, __capacity);
-	      if (_M_length())
-		_S_copy(__tmp, _M_data(), _M_length());
+	      _S_copy(__tmp, _M_data(), _M_length() + 1);
 	      _M_dispose();
 	      _M_data(__tmp);
 	      _M_capacity(__res);
@@ -491,49 +498,49 @@ namespace __gnu_cxx
 	  else if (!_M_is_local())
 	    {
 	      const size_type __tmp_capacity = _M_allocated_capacity;
-	      if (_M_length())
-		_S_copy(_M_local_data, _M_data(), _M_length());
+	      _S_copy(_M_local_data, _M_data(), _M_length() + 1);
 	      _M_destroy(__tmp_capacity + 1);
 	      _M_data(_M_local_data);
-	    }	  
-	  
-	  _M_set_length(_M_length());
+	    }
 	}
     }
 
   template<typename _CharT, typename _Traits, typename _Alloc>
     void
     __sso_string_base<_CharT, _Traits, _Alloc>::
-    _M_mutate(size_type __pos, size_type __len1, size_type __len2)
+    _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
+	      const size_type __len2)
     {
-      const size_type __old_size = _M_length();
-      const size_type __new_size = __old_size + __len2 - __len1;
-      const size_type __how_much = __old_size - __pos - __len1;
+      const size_type __how_much = _M_length() - __pos - __len1;
       
-      if (__new_size > _M_capacity())
-	{
-	  // Must reallocate.
-	  size_type __new_capacity = __new_size;
-	  _CharT* __r = _M_create(__new_capacity, _M_capacity());
+      size_type __new_capacity = _M_length() + __len2 - __len1;
+      _CharT* __r = _M_create(__new_capacity, _M_capacity());
+
+      if (__pos)
+	_S_copy(__r, _M_data(), __pos);
+      if (__s && __len2)
+	_S_copy(__r + __pos, __s, __len2);
+      if (__how_much)
+	_S_copy(__r + __pos + __len2,
+		_M_data() + __pos + __len1, __how_much);
+      
+      _M_dispose();
+      _M_data(__r);
+      _M_capacity(__new_capacity);
+    }
 
-	  if (__pos)
-	    _S_copy(__r, _M_data(), __pos);
-	  if (__how_much)
-	    _S_copy(__r + __pos + __len2,
-		    _M_data() + __pos + __len1, __how_much);
+  template<typename _CharT, typename _Traits, typename _Alloc>
+    void
+    __sso_string_base<_CharT, _Traits, _Alloc>::
+    _M_erase(size_type __pos, size_type __n)
+    {
+      const size_type __how_much = _M_length() - __pos - __n;
 
-	  _M_dispose();
-	  _M_data(__r);
-	  _M_capacity(__new_capacity);
-	}
-      else if (__how_much && __len1 != __len2)
-	{
-	  // Work in-place.
-	  _S_move(_M_data() + __pos + __len2,
-		  _M_data() + __pos + __len1, __how_much);
-	}
+      if (__how_much && __n)
+	_S_move(_M_data() + __pos, _M_data() + __pos + __n,
+		__how_much);
 
-      _M_set_length(__new_size);
+      _M_set_length(_M_length() - __n);
     }
 } // namespace __gnu_cxx
 
diff --git a/libstdc++-v3/include/ext/vstring.h b/libstdc++-v3/include/ext/vstring.h
index 1aaa876..4a52285 100644
--- a/libstdc++-v3/include/ext/vstring.h
+++ b/libstdc++-v3/include/ext/vstring.h
@@ -402,14 +402,14 @@ namespace __gnu_cxx
        */
       void
       reserve(size_type __res_arg = 0)
-      {	this->_M_reserve(__res_arg); }
+      { this->_M_reserve(__res_arg); }
 
       /**
        *  Erases the string, making it empty.
        */
       void
       clear()
-      { this->_M_mutate(0, this->size(), 0); }
+      { this->_M_erase(size_type(0), this->size()); }
 
       /**
        *  Returns true if the %string is empty.  Equivalent to *this == "".
@@ -529,7 +529,8 @@ namespace __gnu_cxx
        *  @return  Reference to this string.
        */
       __versa_string&
-      append(const __versa_string& __str);
+      append(const __versa_string& __str)
+      { return _M_append(__str._M_data(), __str.size()); }
 
       /**
        *  @brief  Append a substring.
@@ -544,7 +545,10 @@ namespace __gnu_cxx
        *  characters in @a str, the remainder of @a str is appended.
        */
       __versa_string&
-      append(const __versa_string& __str, size_type __pos, size_type __n);
+      append(const __versa_string& __str, size_type __pos, size_type __n)
+      { return _M_append(__str._M_data()
+			 + __str._M_check(__pos, "__versa_string::append"),
+			 __str._M_limit(__pos, __n)); }
 
       /**
        *  @brief  Append a C substring.
@@ -553,7 +557,12 @@ namespace __gnu_cxx
        *  @return  Reference to this string.
        */
       __versa_string&
-      append(const _CharT* __s, size_type __n);
+      append(const _CharT* __s, size_type __n)
+      {
+	__glibcxx_requires_string_len(__s, __n);
+	_M_check_length(size_type(0), __n, "__versa_string::append");
+	return _M_append(__s, __n);
+      }
 
       /**
        *  @brief  Append a C string.
@@ -564,7 +573,9 @@ namespace __gnu_cxx
       append(const _CharT* __s)
       {
 	__glibcxx_requires_string(__s);
-	return this->append(__s, traits_type::length(__s));
+	const size_type __n = traits_type::length(__s);
+	_M_check_length(size_type(0), __n, "__versa_string::append");
+	return _M_append(__s, __n);
       }
 
       /**
@@ -576,7 +587,8 @@ namespace __gnu_cxx
        *  Appends n copies of c to this string.
        */
       __versa_string&
-      append(size_type __n, _CharT __c);
+      append(size_type __n, _CharT __c)
+      { return _M_replace_aux(this->size(), size_type(0), __n, __c); }
 
       /**
        *  @brief  Append a range of characters.
@@ -598,11 +610,11 @@ namespace __gnu_cxx
       void
       push_back(_CharT __c)
       { 
-	const size_type __len = 1 + this->size();
-	if (__len > this->capacity() || this->_M_is_shared())
-	  this->reserve(__len);
-	traits_type::assign(this->_M_data()[this->size()], __c);
-	this->_M_set_length(__len);
+	const size_type __size = this->size();
+	if (__size + 1 > this->capacity() || this->_M_is_shared())
+	  this->_M_mutate(__size, size_type(0), 0, size_type(1));
+	traits_type::assign(this->_M_data()[__size], __c);
+	this->_M_set_length(__size + 1);
       }
 
       /**
@@ -631,9 +643,9 @@ namespace __gnu_cxx
        */
       __versa_string&
       assign(const __versa_string& __str, size_type __pos, size_type __n)
-      { return this->assign(__str._M_data()
-			    + __str._M_check(__pos, "__versa_string::assign"),
-			    __str._M_limit(__pos, __n)); }
+      { return _M_replace(size_type(0), this->size(), __str._M_data()
+			  + __str._M_check(__pos, "__versa_string::assign"),
+			  __str._M_limit(__pos, __n)); }
 
       /**
        *  @brief  Set value to a C substring.
@@ -646,7 +658,11 @@ namespace __gnu_cxx
        *  available characters in @a s, the remainder of @a s is used.
        */
       __versa_string&
-      assign(const _CharT* __s, size_type __n);
+      assign(const _CharT* __s, size_type __n)
+      {
+	__glibcxx_requires_string_len(__s, __n);
+	return _M_replace(size_type(0), this->size(), __s, __n);
+      }
 
       /**
        *  @brief  Set value to contents of a C string.
@@ -661,7 +677,8 @@ namespace __gnu_cxx
       assign(const _CharT* __s)
       {
 	__glibcxx_requires_string(__s);
-	return this->assign(__s, traits_type::length(__s));
+	return _M_replace(size_type(0), this->size(), __s,
+			  traits_type::length(__s));
       }
 
       /**
@@ -735,7 +752,8 @@ namespace __gnu_cxx
       */
       __versa_string&
       insert(size_type __pos1, const __versa_string& __str)
-      { return this->insert(__pos1, __str, size_type(0), __str.size()); }
+      { return this->replace(__pos1, size_type(0),
+			     __str._M_data(), __str.size()); }
 
       /**
        *  @brief  Insert a substring.
@@ -758,9 +776,9 @@ namespace __gnu_cxx
       __versa_string&
       insert(size_type __pos1, const __versa_string& __str,
 	     size_type __pos2, size_type __n)
-      { return this->insert(__pos1, __str._M_data()
-			    + __str._M_check(__pos2, "__versa_string::insert"),
-			    __str._M_limit(__pos2, __n)); }
+      { return this->replace(__pos1, size_type(0), __str._M_data()
+			     + __str._M_check(__pos2, "__versa_string::insert"),
+			     __str._M_limit(__pos2, __n)); }
 
       /**
        *  @brief  Insert a C substring.
@@ -779,7 +797,8 @@ namespace __gnu_cxx
        *  thrown.
       */
       __versa_string&
-      insert(size_type __pos, const _CharT* __s, size_type __n);
+      insert(size_type __pos, const _CharT* __s, size_type __n)
+      { return this->replace(__pos, size_type(0), __s, __n); }
 
       /**
        *  @brief  Insert a C string.
@@ -800,7 +819,8 @@ namespace __gnu_cxx
       insert(size_type __pos, const _CharT* __s)
       {
 	__glibcxx_requires_string(__s);
-	return this->insert(__pos, __s, traits_type::length(__s));
+	return this->replace(__pos, size_type(0), __s,
+			     traits_type::length(__s));
       }
 
       /**
@@ -843,7 +863,7 @@ namespace __gnu_cxx
 	const size_type __pos = __p - _M_ibegin();
 	_M_replace_aux(__pos, size_type(0), size_type(1), __c);
 	this->_M_set_leaked();
-	return _M_ibegin() + __pos;
+	return iterator(this->_M_data() + __pos);
       }
 
       /**
@@ -863,8 +883,8 @@ namespace __gnu_cxx
       __versa_string&
       erase(size_type __pos = 0, size_type __n = npos)
       { 
-	this->_M_mutate(_M_check(__pos, "__versa_string::erase"),
-			_M_limit(__pos, __n), size_type(0));
+	this->_M_erase(_M_check(__pos, "__versa_string::erase"),
+		       _M_limit(__pos, __n));
 	return *this;
       }
 
@@ -882,9 +902,9 @@ namespace __gnu_cxx
 	_GLIBCXX_DEBUG_PEDASSERT(__position >= _M_ibegin()
 				 && __position < _M_iend());
 	const size_type __pos = __position - _M_ibegin();
-	this->_M_mutate(__pos, size_type(1), size_type(0));
+	this->_M_erase(__pos, size_type(1));
 	this->_M_set_leaked();
-	return _M_ibegin() + __pos;
+	return iterator(this->_M_data() + __pos);
       }
 
       /**
@@ -902,9 +922,9 @@ namespace __gnu_cxx
 	_GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
 				 && __last <= _M_iend());
         const size_type __pos = __first - _M_ibegin();
-	this->_M_mutate(__pos, __last - __first, size_type(0));
+	this->_M_erase(__pos, __last - __first);
 	this->_M_set_leaked();
-	return _M_ibegin() + __pos;
+	return iterator(this->_M_data() + __pos);
       }
 
       /**
@@ -974,7 +994,12 @@ namespace __gnu_cxx
       */
       __versa_string&
       replace(size_type __pos, size_type __n1, const _CharT* __s,
-	      size_type __n2);
+	      size_type __n2)
+      {
+	__glibcxx_requires_string_len(__s, __n2);
+	return _M_replace(_M_check(__pos, "__versa_string::replace"),
+			  _M_limit(__pos, __n1), __s, __n2);
+      }
 
       /**
        *  @brief  Replace characters with value of a C string.
@@ -1187,8 +1212,11 @@ namespace __gnu_cxx
 		     _CharT __c);
 
       __versa_string&
-      _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
-		      size_type __n2);
+      _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
+		 const size_type __len2);
+
+      __versa_string&
+      _M_append(const _CharT* __s, size_type __n);
 
     public:
 
@@ -1771,12 +1799,7 @@ namespace __gnu_cxx
 	   template <typename, typename, typename> class _Base>
     __versa_string<_CharT, _Traits, _Alloc, _Base>
     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
-	      const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
-    {
-      __versa_string<_CharT, _Traits, _Alloc, _Base> __str(__lhs);
-      __str.append(__rhs);
-      return __str;
-    }
+	      const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs);
 
   /**
    *  @brief  Concatenate C string and string.
@@ -1810,14 +1833,9 @@ namespace __gnu_cxx
    */
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
-    inline __versa_string<_CharT, _Traits, _Alloc, _Base>
+    __versa_string<_CharT, _Traits, _Alloc, _Base>
     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
-	      const _CharT* __rhs)
-    {
-      __versa_string<_CharT, _Traits, _Alloc, _Base> __str(__lhs);
-      __str.append(__rhs);
-      return __str;
-    }
+	      const _CharT* __rhs);
 
   /**
    *  @brief  Concatenate string and character.
@@ -1827,17 +1845,9 @@ namespace __gnu_cxx
    */
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
-    inline __versa_string<_CharT, _Traits, _Alloc, _Base>
+    __versa_string<_CharT, _Traits, _Alloc, _Base>
     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
-	      _CharT __rhs)
-    {
-      typedef __versa_string<_CharT, _Traits, _Alloc, _Base>
-	                                                __string_type;
-      typedef typename __string_type::size_type		__size_type;
-      __string_type __str(__lhs);
-      __str.append(__size_type(1), __rhs);
-      return __str;
-    }
+	      _CharT __rhs);
 
   // operator ==
   /**
diff --git a/libstdc++-v3/include/ext/vstring.tcc b/libstdc++-v3/include/ext/vstring.tcc
index 76fa96b..2fed7e2 100644
--- a/libstdc++-v3/include/ext/vstring.tcc
+++ b/libstdc++-v3/include/ext/vstring.tcc
@@ -47,192 +47,37 @@ namespace __gnu_cxx
 
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
-    __versa_string<_CharT, _Traits, _Alloc, _Base>&
-    __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    assign(const _CharT* __s, size_type __n)
-    {
-      __glibcxx_requires_string_len(__s, __n);
-      _M_check_length(this->size(), __n, "__versa_string::assign");
-      if (_M_disjunct(__s) || this->_M_is_shared())
-	return _M_replace_safe(size_type(0), this->size(), __s, __n);
-      else
-	{
-	  // Work in-place.
-	  const size_type __pos = __s - this->_M_data();
-	  if (__pos >= __n)
-	    this->_S_copy(this->_M_data(), __s, __n);
-	  else if (__pos)
-	    this->_S_move(this->_M_data(), __s, __n);
-	  this->_M_set_length(__n);
-	  return *this;
-	}
-     }
-
-  template<typename _CharT, typename _Traits, typename _Alloc,
-	   template <typename, typename, typename> class _Base>
-    __versa_string<_CharT, _Traits, _Alloc, _Base>&
+    void
     __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    append(size_type __n, _CharT __c)
+    resize(size_type __n, _CharT __c)
     {
-      if (__n)
-	{
-	  _M_check_length(size_type(0), __n, "__versa_string::append");	  
-	  const size_type __len = __n + this->size();
-	  if (__len > this->capacity() || this->_M_is_shared())
-	    this->reserve(__len);
-	  this->_S_assign(this->_M_data() + this->size(), __n, __c);
-	  this->_M_set_length(__len);
-	}
-      return *this;
+      const size_type __size = this->size();
+      if (__size < __n)
+	this->append(__n - __size, __c);
+      else if (__n < __size)
+	this->_M_erase(__n, __size - __n);
     }
 
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
     __versa_string<_CharT, _Traits, _Alloc, _Base>&
     __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    append(const _CharT* __s, size_type __n)
+    _M_append(const _CharT* __s, size_type __n)
     {
-      __glibcxx_requires_string_len(__s, __n);
-      if (__n)
-	{
-	  _M_check_length(size_type(0), __n, "__versa_string::append");
-	  const size_type __len = __n + this->size();
-	  if (__len > this->capacity() || this->_M_is_shared())
-	    {
-	      if (_M_disjunct(__s))
-		this->reserve(__len);
-	      else
-		{
-		  const size_type __off = __s - this->_M_data();
-		  this->reserve(__len);
-		  __s = this->_M_data() + __off;
-		}
-	    }
-	  this->_S_copy(this->_M_data() + this->size(), __s, __n);
-	  this->_M_set_length(__len);
-	}
-      return *this;
-    }
+      const size_type __len = __n + this->size();
 
-  template<typename _CharT, typename _Traits, typename _Alloc,
-	   template <typename, typename, typename> class _Base>
-    __versa_string<_CharT, _Traits, _Alloc, _Base>&
-    __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    append(const __versa_string& __str)
-    {
-      const size_type __size = __str.size();
-      if (__size)
+      if (__len <= this->capacity() && !this->_M_is_shared())
 	{
-	  const size_type __len = __size + this->size();
-	  if (__len > this->capacity() || this->_M_is_shared())
-	    this->reserve(__len);
-	  this->_S_copy(this->_M_data() + this->size(), __str._M_data(),
-			__size);
-	  this->_M_set_length(__len);
+	  if (__n)
+	    this->_S_copy(this->_M_data() + this->size(), __s, __n);
 	}
-      return *this;
-    }    
+      else
+	this->_M_mutate(this->size(), size_type(0), __s, __n);
 
-  template<typename _CharT, typename _Traits, typename _Alloc,
-	   template <typename, typename, typename> class _Base>
-    __versa_string<_CharT, _Traits, _Alloc, _Base>&
-    __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    append(const __versa_string& __str, size_type __pos, size_type __n)
-    {
-      __str._M_check(__pos, "__versa_string::append");
-      __n = __str._M_limit(__pos, __n);
-      if (__n)
-	{
-	  const size_type __len = __n + this->size();
-	  if (__len > this->capacity() || this->_M_is_shared())
-	    this->reserve(__len);
-	  this->_S_copy(this->_M_data() + this->size(),
-			__str._M_data() + __pos, __n);
-	  this->_M_set_length(__len);	  
-	}
+      this->_M_set_length(__len);
       return *this;
     }
 
-   template<typename _CharT, typename _Traits, typename _Alloc,
-	    template <typename, typename, typename> class _Base>
-     __versa_string<_CharT, _Traits, _Alloc, _Base>&
-     __versa_string<_CharT, _Traits, _Alloc, _Base>::
-     insert(size_type __pos, const _CharT* __s, size_type __n)
-     {
-       __glibcxx_requires_string_len(__s, __n);
-       _M_check(__pos, "__versa_string::insert");
-       _M_check_length(size_type(0), __n, "__versa_string::insert");
-       if (_M_disjunct(__s) || this->_M_is_shared())
-         return _M_replace_safe(__pos, size_type(0), __s, __n);
-       else
-         {
-           // Work in-place.
-           const size_type __off = __s - this->_M_data();
-           this->_M_mutate(__pos, 0, __n);
-           __s = this->_M_data() + __off;
-           _CharT* __p = this->_M_data() + __pos;
-           if (__s  + __n <= __p)
-             this->_S_copy(__p, __s, __n);
-           else if (__s >= __p)
-             this->_S_copy(__p, __s + __n, __n);
-           else
-             {
-	       const size_type __nleft = __p - __s;
-               this->_S_copy(__p, __s, __nleft);
-               this->_S_copy(__p + __nleft, __p + __n, __n - __nleft);
-             }
-           return *this;
-         }
-     }
-
-   template<typename _CharT, typename _Traits, typename _Alloc,
-	    template <typename, typename, typename> class _Base>
-     __versa_string<_CharT, _Traits, _Alloc, _Base>&
-     __versa_string<_CharT, _Traits, _Alloc, _Base>::
-     replace(size_type __pos, size_type __n1, const _CharT* __s,
-	     size_type __n2)
-     {
-       __glibcxx_requires_string_len(__s, __n2);
-       _M_check(__pos, "__versa_string::replace");
-       __n1 = _M_limit(__pos, __n1);
-       _M_check_length(__n1, __n2, "__versa_string::replace");
-       bool __left;
-       if (_M_disjunct(__s) || this->_M_is_shared())
-         return _M_replace_safe(__pos, __n1, __s, __n2);
-       else if ((__left = __s + __n2 <= this->_M_data() + __pos)
-		|| this->_M_data() + __pos + __n1 <= __s)
-	 {
-	   // Work in-place: non-overlapping case.
-	   size_type __off = __s - this->_M_data();
-	   __left ? __off : (__off += __n2 - __n1);
-	   this->_M_mutate(__pos, __n1, __n2);
-	   this->_S_copy(this->_M_data() + __pos,
-			 this->_M_data() + __off, __n2);
-	   return *this;
-	 }
-       else
-	 {
-	   // Todo: overlapping case.
-	   const __versa_string __tmp(__s, __n2);
-	   return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
-	 }
-     }
-
-  template<typename _CharT, typename _Traits, typename _Alloc,
-	   template <typename, typename, typename> class _Base>
-    void
-    __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    resize(size_type __n, _CharT __c)
-    {
-      const size_type __size = this->size();
-      _M_check_length(__size, __n, "__versa_string::resize");
-      if (__size < __n)
-	this->append(__n - __size, __c);
-      else if (__n < __size)
-	this->erase(__n);
-      // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
-    }
-
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
     template<typename _InputIterator>
@@ -243,10 +88,8 @@ namespace __gnu_cxx
       {
 	const __versa_string __s(__k1, __k2);
 	const size_type __n1 = __i2 - __i1;
-	_M_check_length(__n1, __s.size(),
-			"__versa_string::_M_replace_dispatch");
-	return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
-			       __s.size());
+	return _M_replace(__i1 - _M_ibegin(), __n1, __s._M_data(),
+			  __s.size());
       }
 
   template<typename _CharT, typename _Traits, typename _Alloc,
@@ -257,9 +100,25 @@ namespace __gnu_cxx
 		   _CharT __c)
     {
       _M_check_length(__n1, __n2, "__versa_string::_M_replace_aux");
-      this->_M_mutate(__pos1, __n1, __n2);
+
+      const size_type __old_size = this->size();
+      const size_type __new_size = __old_size + __n2 - __n1;
+
+      if (__new_size <= this->capacity() && !this->_M_is_shared())
+	{
+	  _CharT* __p = this->_M_data() + __pos1;
+
+	  const size_type __how_much = __old_size - __pos1 - __n1;
+	  if (__how_much && __n1 != __n2)
+	    this->_S_move(__p + __n2, __p + __n1, __how_much);
+	}
+      else
+	this->_M_mutate(__pos1, __n1, 0, __n2);
+
       if (__n2)
 	this->_S_assign(this->_M_data() + __pos1, __n2, __c);
+
+      this->_M_set_length(__new_size);
       return *this;
     }
 
@@ -267,23 +126,77 @@ namespace __gnu_cxx
 	   template <typename, typename, typename> class _Base>
     __versa_string<_CharT, _Traits, _Alloc, _Base>&
     __versa_string<_CharT, _Traits, _Alloc, _Base>::
-    _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
-		    size_type __n2)
+    _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
+	       const size_type __len2)
     {
-      this->_M_mutate(__pos1, __n1, __n2);
-      if (__n2)
-	this->_S_copy(this->_M_data() + __pos1, __s, __n2);
+      _M_check_length(__len1, __len2, "__versa_string::_M_replace");
+
+      const size_type __old_size = this->size();
+      const size_type __new_size = __old_size + __len2 - __len1;
+      
+      if (__new_size <= this->capacity() && !this->_M_is_shared())
+	{
+	  _CharT* __p = this->_M_data() + __pos;
+
+	  const size_type __how_much = __old_size - __pos - __len1;
+	  if (_M_disjunct(__s))
+	    {
+	      if (__how_much && __len1 != __len2)
+		this->_S_move(__p + __len2, __p + __len1, __how_much);
+	      if (__len2)
+		this->_S_copy(__p, __s, __len2);
+	    }
+	  else
+	    {
+	      // Work in-place.
+	      if (__len2 && __len2 <= __len1)
+		this->_S_move(__p, __s, __len2);
+	      if (__how_much && __len1 != __len2)
+		this->_S_move(__p + __len2, __p + __len1, __how_much);
+	      if (__len2 > __len1)
+		{
+		  if (__s + __len2 <= __p + __len1)
+		    this->_S_move(__p, __s, __len2);
+		  else if (__s >= __p + __len1)
+		    this->_S_copy(__p, __s + __len2 - __len1, __len2);
+		  else
+		    {
+		      const size_type __nleft = (__p + __len1) - __s;
+		      this->_S_move(__p, __s, __nleft);
+		      this->_S_copy(__p + __nleft, __p + __len2,
+				    __len2 - __nleft);
+		    }
+		}
+	    }
+	}
+      else
+	this->_M_mutate(__pos, __len1, __s, __len2);
+
+      this->_M_set_length(__new_size);
       return *this;
     }
-   
+  
+  template<typename _CharT, typename _Traits, typename _Alloc,
+	   template <typename, typename, typename> class _Base>
+    __versa_string<_CharT, _Traits, _Alloc, _Base>
+    operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
+	      const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
+    {
+      __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
+      __str.reserve(__lhs.size() + __rhs.size());
+      __str.append(__lhs);
+      __str.append(__rhs);
+      return __str;
+    }
+
   template<typename _CharT, typename _Traits, typename _Alloc,
 	   template <typename, typename, typename> class _Base>
     __versa_string<_CharT, _Traits, _Alloc, _Base>
     operator+(const _CharT* __lhs,
-	      const __versa_string<_CharT, _Traits, _Alloc>& __rhs)
+	      const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
     {
       __glibcxx_requires_string(__lhs);
-      typedef __versa_string<_CharT, _Traits, _Alloc> __string_type;
+      typedef __versa_string<_CharT, _Traits, _Alloc, _Base> __string_type;
       typedef typename __string_type::size_type	  __size_type;
       const __size_type __len = _Traits::length(__lhs);
       __string_type __str;
@@ -299,13 +212,40 @@ namespace __gnu_cxx
     operator+(_CharT __lhs,
 	      const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
     {
-      typedef __versa_string<_CharT, _Traits, _Alloc> __string_type;
+      __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
+      __str.reserve(__rhs.size() + 1);
+      __str.push_back(__lhs);
+      __str.append(__rhs);
+      return __str;
+    }
+
+  template<typename _CharT, typename _Traits, typename _Alloc,
+	   template <typename, typename, typename> class _Base>
+    __versa_string<_CharT, _Traits, _Alloc, _Base>
+    operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
+	      const _CharT* __rhs)
+    {
+      __glibcxx_requires_string(__rhs);
+      typedef __versa_string<_CharT, _Traits, _Alloc, _Base> __string_type;
       typedef typename __string_type::size_type	  __size_type;
+      const __size_type __len = _Traits::length(__rhs);
       __string_type __str;
-      const __size_type __len = __rhs.size();
-      __str.reserve(__len + 1);
-      __str.append(__size_type(1), __lhs);
-      __str.append(__rhs);
+      __str.reserve(__lhs.size() + __len);
+      __str.append(__lhs);
+      __str.append(__rhs, __len);
+      return __str;
+    }
+
+  template<typename _CharT, typename _Traits, typename _Alloc,
+	   template <typename, typename, typename> class _Base>
+    __versa_string<_CharT, _Traits, _Alloc, _Base>
+    operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
+	      _CharT __rhs)
+    {
+      __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
+      __str.reserve(__lhs.size() + 1);
+      __str.append(__lhs);
+      __str.push_back(__rhs);
       return __str;
     }