DoubleBuffer.h

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//
//  DoubleBuffer.h
//  CQTDSP
//
//  Created by Juan Sierra on 3/23/25.
//

 
#pragma once
 
#include <array>
 
namespace jsa::cicuetea {

template <typename T>
class DoubleBuffer
{
  public:
    void fill(const T& value)
    {
        push(value);
        push(value);
    }

    void push(const T& value)
    {
        advance();
        buffer[state] = value;
    }

    void advance()
    {
        state = !state;
    }

    T& next()
    {
        advance();
        return buffer[state];
    }

    const T& current() const { return buffer[state]; }

    const T& last() const { return buffer[!state]; }

    T& last() { return buffer[!state]; }

    T& current() { return buffer[state]; }
 
  private:
    std::array<T, 2> buffer;        
    bool             state = false; 
};
 
} // namespace jsa::cicuetea