volume.h

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#ifndef VOLUME_H
#define VOLUME_H
 
#include <iosfwd>
 
class volume
{
public:
  explicit volume(const int volume_in_percent);
 
  int get_percentage() const noexcept { return m_volume_in_percent; }
 
private:
 
  int m_volume_in_percent;
};
 
volume get_next(const volume& v) noexcept;
 
volume get_previous(const volume& v) noexcept;
 
void test_volume();
 
bool operator==(const volume& lhs, const volume& rhs) noexcept;
bool operator!=(const volume& lhs, const volume& rhs) noexcept;
 
std::ostream& operator<<(std::ostream& os, const volume& v) noexcept;
 
#endif // VOLUME_H