Stateful transforms are simple objects with member functions that maintain state across calls:
constexpr double HalfPi = 3.1415926535897932385 / 2.0;
。关于这个话题，新收录的资料提供了深入分析
15:22, 10 марта 2026Ценности
The scientific term for the rate of the string’s vibration is its frequency. You measure frequency in hertz (Hz), a unit that just means “vibrations per second.” The standard tuning pitch, 440 Hz, is the pitch you hear when an object (like a tuning fork or guitar string) vibrates to and fro 440 times per second.