计时函数在C ++中花费多长时间的最佳方法是什么? [英] What is the best way to time how long functions take in C++?

问题描述

在C#中，我将启动Stopwatch类，以对某些方法花费多长时间进行快速而肮脏的计时.

In C# I would fire up the Stopwatch class to do some quick-and-dirty timing of how long certain methods take.

在C ++中，这等效于什么?有内置的高精度计时器吗?

What is the equivalent of this in C++? Is there a high precision timer built in?

推荐答案

以前，我已经为这种情况实现了一个计时器:实际上，我最终得到了一个具有两个不同实现的类，一个用于Windows，一个用于POSIX.

I've implemented a timer for situations like this before: I actually ended up with a class with two different implemations, one for Windows and one for POSIX.

原因是Windows具有 QueryPerformanceCounter() 函数使您可以访问非常精确的时钟，这是此类计时的理想选择.

The reason was that Windows has the QueryPerformanceCounter() function which gives you access to a very accurate clock which is ideal for such timings.

但是在POSIX上不可用，因此我只使用了 boost.datetime 的类来存储开始时间和结束时间，然后从中计算持续时间.它提供了高分辨率"计时器，但是分辨率是不确定的，并且因平台而异.

On POSIX however this isn't available so I just used boost.datetime's classes to store the start and end times then calculated the duration from those. It offers a "high resolution" timer but the resolution is undefined and varies from platform to platform.

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