Quelle nsPrintfCString.h Sprache: C

/* -*- 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);
    AppendVprintf(aFormat, ap);
    va_end(ap);
  }
};

template <>
struct fmt::formatter<nsPrintfCString, char> : fmt::formatter<nsCString, char> {
};

/**
*
*
* nsVPrintfCString is like nsPrinfCString but is created using vprintf style
* args. This is useful for functions that have already received variadic
* arguments and want to create a nsPrintfCString. For example:
*
* void LogToSeveralLocations(const char* aFormat,...) {
*   va_list ap;
*   va_start(ap, aFormat);
*   nsPrintfCString logString(aFormat, ap);
*   va_end(ap);
*   // Use logString
*  }
*
* See also nsCString::AppendVprintf().
*/

class nsVprintfCString : public nsAutoCStringN<16> {
  typedef nsCString string_type;

public:
  nsVprintfCString(const char_type* aFormat, va_list aArgs)
      MOZ_FORMAT_PRINTF(2, 0) {
    AppendVprintf(aFormat, aArgs);
  }
};

template <>
struct fmt::formatter<nsVprintfCString, char>
    : fmt::formatter<nsCString, char> {};

#endif  // !defined(nsPrintfCString_h___)

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