我使用升压1.46不包括升压::计时器，还有什么其他办法能我一次我的功能。
我目前在做这样的：
time_t now = time(0);
<some stuff>
time_t after = time(0);
cout << after - now << endl;
但它只是给出了在秒的回答，因此，如果函数取<1秒显示为0。
谢谢
Answer 1:
在Linux或Windows：
#include <ctime>
#include <iostream>
int
main(int, const char**)
{
std::clock_t start;
start = std::clock();
// your test
std::cout << "Time: " << (std::clock() - start) / (double)(CLOCKS_PER_SEC / 1000) << " ms" << std::endl;
return 0;
}
祝好运 ;）
Answer 2:
使用std::chrono ：
#include <chrono>
#include <thread>
#include <iostream>
// There are other clocks, but this is usually the one you want.
// It corresponds to CLOCK_MONOTONIC at the syscall level.
using Clock = std::chrono::steady_clock;
using std::chrono::time_point;
using std::chrono::duration_cast;
using std::chrono::milliseconds;
using namespace std::literals::chrono_literals;
using std::this_thread::sleep_for;
int main()
{
time_point<Clock> start = Clock::now();
sleep_for(500ms);
time_point<Clock> end = Clock::now();
milliseconds diff = duration_cast<milliseconds>(end - start);
std::cout << diff.count() << "ms" << std::endl;
}
std::chrono是C ++ 11， std::literals是C ++ 14（否则需要milliseconds(500)
Answer 3:
原来存在的升压1.46（刚刚在不同的位置）时的版本。 由于@jogojapan指点出来。
这是可以做到这样的：
#include <boost/timer.hpp>
timer t;
<some stuff>
std::cout << t.elapsed() << std::endl;
或可选择地使用std库作为@Quentin佩雷斯指出（我将接受什么最初问）
Answer 4:
在昆汀·佩雷斯的解决方案的基础上，你可以使用std ::功能和拉姆达传递一个任意功能的时间。
#include <ctime>
#include <iostream>
#include <functional>
void timeit(std::function<void()> func) {
std::clock_t start = std::clock();
func();
int ms = (std::clock() - start) / (double) (CLOCKS_PER_SEC / 1000);
std::cout << "Finished in " << ms << "ms" << std::endl;
}
int main() {
timeit([] {
for (int i = 0; i < 10; ++i) {
std::cout << "i = " << i << std::endl;
}
});
return 0;
}
Answer 5:
您可以使用长以保存当前时间值作为初始值，然后将当前时间转换为双。 这里是一些代码片段作为例子来使用。
#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/timeb.h>
int main()
{
struct _timeb tStruct;
double thisTime;
bool done = false;
long startTime;
struct _timeb
{
int dstflag; // holds a non-zero value if daylight saving time is in effect
long millitm; // time in milliseconds since the last one-second hack
long time; // time in seconds since 00:00:00 1/1/1970
long timezone; // difference in minutes moving west from UTC
};
_ftime(&tStruct); // Get start time
thisTime = tStruct.time + (((double)(tStruct.millitm)) / 1000.0); // Convert to double
startTime = thisTime; // Set the starting time (when the function begins)
while(!done) // Start an eternal loop
{
system("cls"); // Clear the screen
_ftime(&tStruct); // Get the current time
thisTime = tStruct.time + (((double)(tStruct.millitm)) / 1000.0); // Convert to double
// Check for 5 second interval to print status to screen
cout << thisTime-startTime; // Print it.
}
}
文章来源: How to time a function in milliseconds without boost::timer
