Timer.h

Go to the documentation of this file.

/**
 * @file   Timer.h
 * @author Sebastian Junges
 * @author Gereon Kremer
 *
 */
 
#pragma once
 
#include <chrono>
#include <ostream>
 
namespace carl
{
/**
 * This classes provides an easy way to obtain the current number of milliseconds that the program has been running.
 */
class Timer {
    /// The clock type used jere.
    using clock = std::chrono::high_resolution_clock;
    /// The duration type used here.
    using duration = std::chrono::duration<std::size_t,std::milli>;
    /// Start of this timer.
    clock::time_point mStart;
public:
    Timer() noexcept: mStart(clock::now()) {}
 
    /**
     * Calculated the number of milliseconds since this object has been created.
     * @return Milliseconds passed.
     */
    std::size_t passed() const noexcept {
        clock::duration d(clock::now() - mStart);
        return std::chrono::duration_cast<duration>(d).count();
    }
 
    /**
     * Reset the start point to now.
     */
    void reset() noexcept {
        mStart = clock::now();
    }
};
/**
 * Streaming operator for a Timer.
 * Prints the result of `t.passed()`.
 * @param os Output stream.
 * @param t Timer.
 * @return os.
 */
inline std::ostream& operator<<(std::ostream& os, const Timer& t) {
    return os << t.passed();
}
 
}