Class for relative wall-clock time.
class tick_count::interval_t;
#include "tbb/tick_count.h"
A tick_count::interval_t represents relative wall clock duration.
namespace tbb { class tick_count::interval_t { public: interval_t(); explicit interval_t( double sec ); double seconds() const; interval_t operator+=( const interval_t& i ); interval_t operator-=( const interval_t& i ); }; tick_count::interval_t operator+( const tick_count::interval_t& i, const tick_count::interval_t& j ); tick_count::interval_t operator-( const tick_count::interval_t& i, const tick_count::interval_t& j ); } // namespace tbb
Member | Description |
---|---|
interval_t() |
Constructs interval_t representing zero time duration. |
interval_t( double sec ) |
Constructs interval_t representing specified number of seconds. |
double seconds() const |
Returns: Time interval measured in seconds. |
interval_t operator+=( const interval_t& i ) |
*this = *this + i Returns: Reference to *this. |
interval_t operator-=( const interval_t& i ) |
*this = *this - i Returns: Reference to *this. |
interval_t operator+ ( const interval_t& i, const interval_t& j ) |
Returns: Interval_t representing sum of intervals i and j. |
interval_t operator- ( const interval_t& i, const interval_t& j ) |
Returns Interval_t representing difference of intervals i and j. |
On Microsoft Windows* operating systems, the current implementation of tick_count::seconds() uses the function QueryPerformanceFrequency. Repeated calls to tick_count::seconds() result in multiple calls to QueryPerformanceFrequency, which can be inefficient. In tight loops accumulated time should be stored as tick_count::interval_t values, with conversion to tick_count::seconds() performed outside measured code.