本文介绍了如何使用C++实现高精度计时器，包括将64位整数转换为int64_t类型、获取高性能计数器的时间戳以及将计数器间隔转换为微秒等关键函数。
//时间计算
static int64_t LargeIntegerToInt64(const LARGE_INTEGER& i) {
return ((int64_t)i.HighPart) << 32 | i.LowPart;
}
static int64_t HighResTimer() {
LARGE_INTEGER counter;
QueryPerformanceCounter(&counter);
return LargeIntegerToInt64(counter);
}
static int64_t TimerToMicros(int64_t dt) {
static int64_t ticks_per_sec = 0;
if (!ticks_per_sec) {
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
ticks_per_sec = LargeIntegerToInt64(freq);
}
// dt is in ticks. We want microseconds.
return (dt * 1000000) / ticks_per_sec;
}
static int64_t LargeIntegerToInt64(const LARGE_INTEGER& i) {
return ((int64_t)i.HighPart) << 32 | i.LowPart;
}
static int64_t HighResTimer() {
LARGE_INTEGER counter;
QueryPerformanceCounter(&counter);
return LargeIntegerToInt64(counter);
}
static int64_t TimerToMicros(int64_t dt) {
static int64_t ticks_per_sec = 0;
if (!ticks_per_sec) {
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
ticks_per_sec = LargeIntegerToInt64(freq);
}
// dt is in ticks. We want microseconds.
return (dt * 1000000) / ticks_per_sec;
}
扫一扫
1040
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
