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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.

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