c – 这是内联函数的有效用法吗？

@H_450_1@假设我有这个代码(不要介意SecondsTominutes和minutesToHours是彼此的副本)

inline float SecondsTominutes(float seconds)
{
    return seconds / 60.0;
}
inline float minutesToHours(float minutes)
{
    return minutes / 60.0;
}
inline float HoursToDays(float minutes)
{
    return minutes / 24.0;
}
inline float SeconndsToHours(float seconds)
{
    return minutesToHours(SecondsTominutes(seconds));
}
inline float minutesToDays(float minutes)
{
    return HoursToDays(minutesToHours(minutes));
}
inline float SeconndsDays(float seconds)
{
    return minutesToDays(SecondsTominutes(seconds));
}

这是内联的有效用法吗？是否有意义？这是好习惯吗？毕竟,如果我没记错的话,内联意味着函数调用被函数体替换,所以

return minutesToDays(SecondsTominutes(seconds))

应该相当于

return seconds / 60.0 / 60.0 / 24.0

对？

或者为此使用宏更好吗？

#define EXCHANGE_SEC_MIN(X) (x / 60.0)
#define EXCHANGE_MIN_H(X) (x / 60.0)
#define EXCHANGE_H_D(X) (x / 24.0)
#define EXCHANGE_SEC_H(X) (EXCHANGE_MIN_H(EXCHANGE_SEC_MIN(X)))
#define EXCHANGE_MIN_D(X) (EXCHANGE_H_D(EXCHANGE_MIN_H(X)))
#define EXCHANGE_SEC_D(X) (EXCHANGE_MIN_D(EXCHANGE_SEC_MIN(X)))

哪一个更好的做法？或者两者都不是？我希望其他人能分一杯羹.

constexpr float SecondsTominutes(float seconds)
{
    return seconds / 60.0;
}
//etc..