unit_delay.hpp

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#pragma once
 
#include <type_traits>
 
namespace pulp::signal {

template <typename SampleType = float> class UnitDelayT {
    static_assert(std::is_floating_point_v<SampleType>,
                  "UnitDelayT requires a floating-point sample type");
 
  public:
    [[nodiscard]] SampleType publish() const noexcept {
        return state_;
    }
 
    void commit(SampleType input) noexcept {
        state_ = input;
    }
 
    [[nodiscard]] SampleType process(SampleType input) noexcept {
        const SampleType output = publish();
        commit(input);
        return output;
    }
 
    void reset() noexcept {
        state_ = SampleType{};
    }
 
  private:
    SampleType state_{};
};
 
using UnitDelay = UnitDelayT<float>;
using UnitDelay64 = UnitDelayT<double>;
 
static_assert(sizeof(UnitDelay) == sizeof(float));
static_assert(alignof(UnitDelay) == alignof(float));
 
} // namespace pulp::signal