// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "base/string_util.h"

#include <windows.h>
#include <string>
#include "unicode/numfmt.h"
#include "base/logging.h"

NumberFormat* NumberFormatSingleton() {
  static NumberFormat* number_format = NULL;
  if (!number_format) {
    // Make sure we are thread-safe.
    UErrorCode status = U_ZERO_ERROR;
    NumberFormat* new_number_format = NumberFormat::createInstance(status);
    if (U_FAILURE(status)) {
      NOTREACHED();
    }
    if (InterlockedCompareExchangePointer(
        reinterpret_cast<PVOID*>(&number_format), new_number_format, NULL)) {
      // The old value was non-NULL, so no replacement was done. Another
      // thread did the initialization out from under us.
      if (new_number_format)
        delete new_number_format;
    }
  }
  return number_format;
}