tick_count class#

[timing.tick_count]

A tick_count is an absolute wall clock timestamp. Two tick_count objects can be subtracted to compute wall clock duration tick_count::interval_t, which can be converted to seconds.

namespace oneapi {
namespace tbb {

    class tick_count {
    public:
        class interval_t;
        tick_count();
        tick_count( const tick_count& );
        ~tick_count();
        tick_count& operator=( const tick_count& );
        static tick_count now();
        static double resolution();
    };

} // namespace tbb
} // namespace oneapi

tick_count(): Constructs tick_count with an unspecified wall clock timestamp.
tick_count( const tick_count& ): Constructs tick_count with the timestamp of the given tick_count.
~tick_count(): Destructor.
tick_count& operator=( const tick_count& ): Assigns the timestamp of one tick_count to another.
static tick_count now(): Returns a tick_count object that represents the current wall clock timestamp.
static double resolution(): Returns the resolution of the clock used by tick_count, in seconds.

tick_count::interval_t class#

[timing.tick_count.interval_t]

A tick_count::interval_t represents wall clock duration.

namespace oneapi {
namespace tbb {

    class tick_count::interval_t {
    public:
        interval_t();
        explicit interval_t( double );
        ~interval_t();
        interval_t& operator=( const interval_t& );
        interval_t& operator+=( const interval_t& );
        interval_t& operator-=( const interval_t& );
        double seconds() const;
    };

} // namespace tbb
} // namespace oneapi

interval_t(): Constructs interval_t representing zero time duration.
explicit interval_t( double ): Constructs interval_t representing the specified number of seconds.
~interval_t(): Destructor.
interval_t& operator=( const interval_t& ): Assigns the wall clock duration of one interval_t to another.
interval_t& operator+=( const interval_t& ): Increases the duration to the given interval_t, and returns *this.
interval_t& operator-=( const interval_t& ): Decreases the duration to the given interval_t, and returns *this.
double seconds() const: Returns the duration measured in seconds.

Non-member functions#

[timing.tick_count.nonmember]

These functions provide arithmetic binary operations with wall clock timestamps and durations.

oneapi::tbb::tick_count::interval_t operator-( const oneapi::tbb::tick_count&, const oneapi::tbb::tick_count& );
oneapi::tbb::tick_count::interval_t operator+( const oneapi::tbb::tick_count::interval_t&, const oneapi::tbb::tick_count::interval_t& );
oneapi::tbb::tick_count::interval_t operator-( const oneapi::tbb::tick_count::interval_t&, const oneapi::tbb::tick_count::interval_t& );

The namespace where these functions are defined is unspecified as long as they may be used in respective binary operation expressions on tick_count and tick_count::interval_t objects. For example, an implementation may define the classes and functions in the same unspecified internal namespace, and define oneapi::tbb::tick_count as a type alias for which the non-member functions are reachable only via argument-dependent lookup.

oneapi::tbb::tick_count::interval_t operator-( const oneapi::tbb::tick_count&, const oneapi::tbb::tick_count& ): Returns interval_t representing the duration between two given wall clock timestamps.
oneapi::tbb::tick_count::interval_t operator+( const oneapi::tbb::tick_count::interval_t&, const oneapi::tbb::tick_count::interval_t& ): Returns interval_t representing the sum of two given intervals.
oneapi::tbb::tick_count::interval_t operator-( const oneapi::tbb::tick_count::interval_t&, const oneapi::tbb::tick_count::interval_t& ): Returns interval_t representing the difference of two given intervals.

tick_count class

Contents

tick_count class#

tick_count::interval_t class#

Non-member functions#