Chrono: add class SignedSongTime
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@ -83,4 +83,68 @@ public:
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}
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};
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/**
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* A variant of #SongTime that is based on a signed integer. It can
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* be used for relative values.
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*/
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class SignedSongTime : public std::chrono::duration<std::int32_t, std::milli> {
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typedef std::chrono::duration<std::int32_t, std::milli> Base;
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typedef Base::rep rep;
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public:
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SignedSongTime() = default;
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template<typename T>
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explicit constexpr SignedSongTime(T t):Base(t) {}
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/**
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* This constructor allows implicit conversion from the base
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* class to this class. It is necessary because all of
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* std::chrono::duration's operators return another
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* std::chrono::duration and not an instance of this class.
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*/
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constexpr SignedSongTime(Base b):Base(b) {}
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static constexpr SignedSongTime FromS(int s) {
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return SignedSongTime(rep(s) * 1000);
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}
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static constexpr SignedSongTime FromS(float s) {
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return SignedSongTime(rep(s * 1000));
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}
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static constexpr SignedSongTime FromS(double s) {
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return SignedSongTime(rep(s * 1000));
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}
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static constexpr SignedSongTime FromMS(rep ms) {
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return SignedSongTime(ms);
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}
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constexpr rep ToMS() const {
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return count();
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}
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template<typename T=rep>
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constexpr T ToScale(unsigned base) const {
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return count() * T(base) / 1000;
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}
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constexpr double ToDoubleS() const {
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return double(count()) / 1000.;
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};
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constexpr bool IsZero() const {
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return count() == 0;
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}
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constexpr bool IsPositive() const {
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return count() > 0;
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}
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constexpr bool IsNegative() const {
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return count() < 0;
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}
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};
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#endif
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