double_buffer.hpp

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#ifndef EAGINE_DOUBLE_BUFFER_HPP
#define EAGINE_DOUBLE_BUFFER_HPP
 
#include <array>
 
namespace eagine {
 
template <typename T>
class double_buffer {
public:
    double_buffer() = default;
 
    double_buffer(const T& initial)
      : _values{{initial, initial}} {}
 
    void swap() noexcept {
        _idx = !_idx;
    }
 
    auto front() noexcept -> T& {
        return _idx ? _values.back() : _values.front();
    }
 
    auto front() const noexcept -> const T& {
        return _idx ? _values.back() : _values.front();
    }
 
    auto back() noexcept -> T& {
        return _idx ? _values.front() : _values.back();
    }
 
    auto back() const noexcept -> const T& {
        return _idx ? _values.front() : _values.back();
    }
 
private:
    std::array<T, 2> _values{};
    bool _idx{false};
};
 
} // namespace eagine
 
#endif // EAGINE_DOUBLE_BUFFER_HPP