michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsPrintfCString_h___
michael@0: #define nsPrintfCString_h___
michael@0:  
michael@0: #include "nsString.h"
michael@0: 
michael@0: /**
michael@0:  * nsPrintfCString lets you create a nsCString using a printf-style format
michael@0:  * string.  For example:
michael@0:  *
michael@0:  *   NS_WARNING(nsPrintfCString("Unexpected value: %f", 13.917).get());
michael@0:  *
michael@0:  * nsPrintfCString has a small built-in auto-buffer.  For larger strings, it
michael@0:  * will allocate on the heap.
michael@0:  *
michael@0:  * See also nsCString::AppendPrintf().
michael@0:  */
michael@0: class nsPrintfCString : public nsFixedCString
michael@0: {
michael@0:   typedef nsCString string_type;
michael@0: 
michael@0: public:
michael@0:   explicit nsPrintfCString( const char_type* format, ... )
michael@0:     : nsFixedCString(mLocalBuffer, kLocalBufferSize, 0)
michael@0:   {
michael@0:     va_list ap;
michael@0:     va_start(ap, format);
michael@0:     AppendPrintf(format, ap);
michael@0:     va_end(ap);
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   static const uint32_t kLocalBufferSize = 16;
michael@0:   char_type mLocalBuffer[kLocalBufferSize];
michael@0: };
michael@0: 
michael@0: #endif // !defined(nsPrintfCString_h___)