string_util support for joining strings using strings not just chars.

base/string_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/string_util.h"
 
 #include "build/build_config.h"
 
 #include <ctype.h>
 #include <errno.h>
@@ skipping 732 matching lines @@
   return TokenizeT(str, delimiters, tokens);
 }
 
 size_t Tokenize(const base::StringPiece& str,
                 const base::StringPiece& delimiters,
                 std::vector<base::StringPiece>* tokens) {
   return TokenizeT(str, delimiters, tokens);
 }
 
 template<typename STR>
-static STR JoinStringT(const std::vector<STR>& parts,
-                       typename STR::value_type sep) {
+static STR JoinStringT(const std::vector<STR>& parts, const STR& sep) {
   if (parts.empty())
     return STR();
 
   STR result(parts[0]);
   typename std::vector<STR>::const_iterator iter = parts.begin();
   ++iter;
 
   for (; iter != parts.end(); ++iter) {
     result += sep;
     result += *iter;
   }
 
   return result;
 }
 
 std::string JoinString(const std::vector<std::string>& parts, char sep) {
-  return JoinStringT(parts, sep);
+  return JoinStringT(parts, std::string(1, sep));
 }
 
 string16 JoinString(const std::vector<string16>& parts, char16 sep) {
-  return JoinStringT(parts, sep);
+  return JoinStringT(parts, string16(1, sep));
+}
+
+std::string JoinString(const std::vector<std::string>& parts,
+                       const std::string& separator) {
+  return JoinStringT(parts, separator);
+}
+
+string16 JoinString(const std::vector<string16>& parts,
+                    const string16& separator) {
+  return JoinStringT(parts, separator);
 }
 
 template<class FormatStringType, class OutStringType>
 OutStringType DoReplaceStringPlaceholders(const FormatStringType& format_string,
     const std::vector<OutStringType>& subst, std::vector<size_t>* offsets) {
   size_t substitutions = subst.size();
 
   size_t sub_length = 0;
   for (typename std::vector<OutStringType>::const_iterator iter = subst.begin();
        iter != subst.end(); ++iter) {
@@ skipping 256 matching lines @@
 }
 
 }  // namespace
 
 size_t base::strlcpy(char* dst, const char* src, size_t dst_size) {
   return lcpyT<char>(dst, src, dst_size);
 }
 size_t base::wcslcpy(wchar_t* dst, const wchar_t* src, size_t dst_size) {
   return lcpyT<wchar_t>(dst, src, dst_size);
 }