Chords.hpp

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#pragma once
 
#include "Intervals.hpp"
#include <Def/Def.hpp>
 
BEGIN_CS_NAMESPACE
 
class IChord {
  public:
    virtual ~IChord() = default;
    virtual const int8_t *begin() const = 0;
    virtual const int8_t *end() const = 0;
};
 
template <uint8_t N>
class Chord : public IChord {
  public:
    Chord(const Array<int8_t, N> &offsets) : offsets(offsets) {}
    const int8_t *begin() const override { return offsets.begin(); }
    const int8_t *end() const override { return offsets.end(); }
 
    template <uint8_t M>
    Chord<N + M> operator+(const Chord<M> &rhs) const {
        return {cat(this->getOffsets(), rhs.getOffsets())};
    }
 
    Chord<N + 1> operator+(int8_t rhs) const { return *this + Chord<1>{{rhs}}; }
 
    const Array<int8_t, N> getOffsets() const { return offsets; }
 
  private:
    Array<int8_t, N> offsets;
};
 
/// @addtogroup MIDIConstants
/// @{
 
/// Predefined Chord constants.
namespace Chords {
 
using namespace Intervals;
 
const Chord<2> Major = {{M3, P5}};
const Chord<2> MajorFirstInv = {{M3, P5 - P8}};       // First inversion
const Chord<2> MajorSecondInv = {{M3 - P8, P5 - P8}}; // Second inversion
 
const Chord<2> Minor = {{m3, P5}};
const Chord<2> MinorFirstInv = {{m3, P5 - P8}};
const Chord<2> MinorSecondInv = {{m3 - P8, P5 - P8}};
 
const Chord<2> Diminished = {{m3, d5}};
const Chord<2> Augmented = {{m3, m6}};
 
const Chord<3> DominantSeventh = {{M3, P5, m7}};
const Chord<3> MajorSeventh = {{M3, P5, M7}};
 
} // namespace Chords
 
/// Predefined Chord constants with bass notes.
namespace Bass {
 
using namespace Intervals;
 
const Chord<1> Single = {{-P8}};
const Chord<2> Double = {{-P8, -2 * P8}};
const Chord<3> Triple = {{-P8, -2 * P8, -3 * P8}};
 
} // namespace Bass
 
/// @}
 
END_CS_NAMESPACE