xpcom/string/nsPrintfCString.h
author Mozilla Releng Treescript <release+treescript@mozilla.org>
Fri, 06 Dec 2019 04:23:41 +0000
changeset 566713 dc4c3ab09235eb507137589068faee7a83f3ffa1
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
No bug - Tagging 229d39ef27112e05308a8cad984332724e0109e1 with DEVEDITION_72_0b3_BUILD1 a=release CLOSED TREE DONTBUILD

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsPrintfCString_h___
#define nsPrintfCString_h___

#include "nsString.h"

/**
 * nsPrintfCString lets you create a nsCString using a printf-style format
 * string.  For example:
 *
 *   NS_WARNING(nsPrintfCString("Unexpected value: %f", 13.917).get());
 *
 * nsPrintfCString has a small built-in auto-buffer.  For larger strings, it
 * will allocate on the heap.
 *
 * See also nsCString::AppendPrintf().
 */
class nsPrintfCString : public nsAutoCStringN<16> {
  typedef nsCString string_type;

 public:
  explicit nsPrintfCString(const char_type* aFormat, ...)
      MOZ_FORMAT_PRINTF(2, 3) {
    va_list ap;
    va_start(ap, aFormat);
    AppendPrintf(aFormat, ap);
    va_end(ap);
  }
};

#endif  // !defined(nsPrintfCString_h___)