delta_t.h

#ifndef DELTA_T_H
#define DELTA_T_H

#include <iosfwd>
#include <string>

/// The time that passes
/// where
///   * 0.01 means that only 1% of the full move is done
///   * 1.0 denotes a full move, i.e. a piece traverses 1.0 game coordinat
class delta_t
{
public:
  explicit delta_t(const double dt);

  double get() const noexcept { return m_delta_t; }

private:

  double m_delta_t;
};

/// Test this class and its free functions
void test_delta_t();

bool operator==(const delta_t& lhs, const delta_t& rhs) noexcept;
bool operator<(const delta_t& lhs, const delta_t& rhs) noexcept;
bool operator<=(const delta_t& lhs, const delta_t& rhs) noexcept;
delta_t& operator+=(delta_t& lhs, const delta_t& rhs) noexcept;
delta_t operator+(const delta_t& lhs, const delta_t& rhs) noexcept;
delta_t operator-(const delta_t& lhs, const delta_t& rhs) noexcept;
delta_t operator*(const delta_t& lhs, const delta_t& rhs) noexcept;
bool operator>(const delta_t& lhs, const delta_t& rhs) noexcept;
bool operator>=(const delta_t& lhs, const delta_t& rhs) noexcept;

std::ostream& operator<<(std::ostream& os, const delta_t& dt) noexcept;

#endif // DELTA_T_H