I am trying top port this code : float interpolate( float from, float to, float amount, float (*easing)(float) ) { return from + ( to-from )*( easing( amount ) ); }
float linear_interpolation( float p ) { return p; } the "float (*easing)(float) " part needs to be rewritten as "float function(float) easing" as far as I know and could find here http://dlang.org/deprecate.html#C-style function pointers. so my code is written as: import std.stdio; float interpolate(float from, float to, float amount, float function(float) easing) { return from + (to - from) * (easing(amount)); } float lineair_interpolation(float p) { return p; } void main() { writeln(interpolate(100,100,10, lineair_interpolation)); } this errors witha : Error: function test.lineair_interpolation (float p) is not callable using argument types (), but I don't really know where to go from here.