Move WriteInto to base namespace.

base/strings/string_util.h

 // Copyright 2013 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.
 //
 // This file defines utility functions for working with strings.
 
 #ifndef BASE_STRINGS_STRING_UTIL_H_
 #define BASE_STRINGS_STRING_UTIL_H_
 
 #include <ctype.h>
@@ skipping 433 matching lines @@
     base::string16* str,
     size_t start_offset,
     StringPiece16 find_this,
     StringPiece16 replace_with);
 BASE_EXPORT void ReplaceSubstringsAfterOffset(
     std::string* str,
     size_t start_offset,
     StringPiece find_this,
     StringPiece replace_with);
 
-}  // namespace base
-
-#if defined(OS_WIN)
-#include "base/strings/string_util_win.h"
-#elif defined(OS_POSIX)
-#include "base/strings/string_util_posix.h"
-#else
-#error Define string operations appropriately for your platform
-#endif
-
 // Reserves enough memory in |str| to accommodate |length_with_null| characters,
 // sets the size of |str| to |length_with_null - 1| characters, and returns a
 // pointer to the underlying contiguous array of characters.  This is typically
 // used when calling a function that writes results into a character array, but
 // the caller wants the data to be managed by a string-like object.  It is
 // convenient in that is can be used inline in the call, and fast in that it
 // avoids copying the results of the call from a char* into a string.
 //
 // |length_with_null| must be at least 2, since otherwise the underlying string
 // would have size 0, and trying to access &((*str)[0]) in that case can result
 // in a number of problems.
 //
 // Internally, this takes linear time because the resize() call 0-fills the
 // underlying array for potentially all
 // (|length_with_null - 1| * sizeof(string_type::value_type)) bytes.  Ideally we
 // could avoid this aspect of the resize() call, as we expect the caller to
 // immediately write over this memory, but there is no other way to set the size
 // of the string, and not doing that will mean people who access |str| rather
 // than str.c_str() will get back a string of whatever size |str| had on entry
 // to this function (probably 0).
-template <class string_type>
-inline typename string_type::value_type* WriteInto(string_type* str,
-                                                   size_t length_with_null) {
-  DCHECK_GT(length_with_null, 1u);
-  str->reserve(length_with_null);
-  str->resize(length_with_null - 1);
-  return &((*str)[0]);
-}
+BASE_EXPORT char* WriteInto(std::string* str, size_t length_with_null);
+BASE_EXPORT char16* WriteInto(base::string16* str, size_t length_with_null);
+#ifndef OS_WIN
+BASE_EXPORT wchar_t* WriteInto(std::wstring* str, size_t length_with_null);
+#endif
+
+}  // namespace base
+
+#if defined(OS_WIN)
+#include "base/strings/string_util_win.h"
+#elif defined(OS_POSIX)
+#include "base/strings/string_util_posix.h"
+#else
+#error Define string operations appropriately for your platform
+#endif
 
 //-----------------------------------------------------------------------------
 
 // Does the opposite of SplitString().
 BASE_EXPORT base::string16 JoinString(const std::vector<base::string16>& parts,
                                       base::char16 s);
 BASE_EXPORT std::string JoinString(
     const std::vector<std::string>& parts, char s);
 
 // Join |parts| using |separator|.
@@ skipping 18 matching lines @@
     const std::vector<std::string>& subst,
     std::vector<size_t>* offsets);
 
 // Single-string shortcut for ReplaceStringHolders. |offset| may be NULL.
 BASE_EXPORT base::string16 ReplaceStringPlaceholders(
     const base::string16& format_string,
     const base::string16& a,
     size_t* offset);
 
 #endif  // BASE_STRINGS_STRING_UTIL_H_