backIn backInOut backOut bounceIn bounceInOut bounceOut byName circularIn circularInOut circularOut cubicIn cubicInOut cubicOut def elasticIn elasticInOut elasticOut exponentialIn exponentialInOut exponentialOut linear quadraticIn quadraticInOut quadraticOut quarticIn quarticInOut quarticOut quinticIn quinticInOut quinticOut sinusoidalIn sinusoidalInOut sinusoidalOut stepped

def detail::defaultEasing def {} inlineconstexpr Default easing function, alias for linear easing. The def easing is a convenience alias for linear, providing the same constant-velocity interpolation with no acceleration or deceleration. It exists as a semantic indicator that the default easing behavior is being explicitly chosen. Using def instead of linear can make code intent clearer in contexts where you want to explicitly state "use the default behavior" rather than specifically requesting linear motion. However, both are functionally identical. This is the easing applied when no via() call is made in the tween builder. // These three tweens are functionally identical: auto t1 = tweeny::from(0).to(100).during(60U).build(); // Implicit default auto t2 = tweeny::from(0).to(100).via(easing::def).during(60U).build(); auto t3 = tweeny::from(0).to(100).via(easing::linear).during(60U).build(); See also linear For the primary documentation of this easing behavior