strcopys.cpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C++ 代码 · 共 58 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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*  ========================================================================
*
* Description: Benchmark program that does a lot of std::string copying.
*              This version copies "short" strings to emphasize the over-
*              head associated with copying.
*
****************************************************************************/

#include <iostream>
#include <string>
#include "timer.h"

#define SHRT_SIZE     3       // Base size of a 'short' string.
#define SHRTDUMP_SIZE 10000   // Number of strings in short string dump.
#define SHRT_COUNT    10000   // Number of times short string loop executes.

std::string shrt_dump;

int main( )
{
  TimerOn();
  for( int i = 0; i < SHRT_COUNT; ++i ) {
    std::string shrt_s( SHRT_SIZE, 'x' );
    for( int j = 0; j < SHRTDUMP_SIZE; ++j ) {
      shrt_dump = shrt_s;
    }
  }
  TimerOff();
  std::cout << "short loop: ";
  std::cout << ( TimerElapsed( )/SHRT_COUNT ) * 1000 << " ms/pass\n";

  return( 0 );
}