测试代码运行效率
#include <time.h>
#define BEGIN_COUNT(mark) __int64 __begin_count##mark;\
QueryPerformanceCounter((LARGE_INTEGER*)&__begin_count##mark);\
#define END_COUNT(mark) __int64 __end_count##mark;\
QueryPerformanceCounter((LARGE_INTEGER*)&__end_count##mark);\
__int64 __Frequency##mark;\
QueryPerformanceFrequency((LARGE_INTEGER*)&__Frequency##mark);\
double __interval##mark;\
__interval##mark = __end_count##mark - __begin_count##mark;\
double __begin##mark;\
__begin##mark = __begin_count##mark * 1000000 /__Frequency##mark;\
double __end##mark;\
__end##mark = __end_count##mark * 1000000 /__Frequency##mark;\
double __usec##mark;\
__usec##mark = __interval##mark * 1000000 /__Frequency##mark;\
ATLTRACE("From begin %10.2lf\n to end %10.2lf,\nCPU elapsed time %10.2lf microseconds",__begin##mark,__end##mark,__usec##mark);\
#define BEGIN_COUNT(mark) __int64 __begin_count##mark;\
QueryPerformanceCounter((LARGE_INTEGER*)&__begin_count##mark);\
#define END_COUNT(mark) __int64 __end_count##mark;\
QueryPerformanceCounter((LARGE_INTEGER*)&__end_count##mark);\
__int64 __Frequency##mark;\
QueryPerformanceFrequency((LARGE_INTEGER*)&__Frequency##mark);\
double __interval##mark;\
__interval##mark = __end_count##mark - __begin_count##mark;\
double __begin##mark;\
__begin##mark = __begin_count##mark * 1000000 /__Frequency##mark;\
double __end##mark;\
__end##mark = __end_count##mark * 1000000 /__Frequency##mark;\
double __usec##mark;\
__usec##mark = __interval##mark * 1000000 /__Frequency##mark;\
ATLTRACE("From begin %10.2lf\n to end %10.2lf,\nCPU elapsed time %10.2lf microseconds",__begin##mark,__end##mark,__usec##mark);\