Hello, Iám new to D so i might be all wrong. Given the code:
class Foo { int opApply( int delegate(ref real) dg ) {...} //A. int opApply( int delegate(real) dg ) {...} // B, } ... Foo foo = new Foo; foreach( a; foo ) {...} // 1. foreach( ref a; foo ) {...} // 2, Is it normal that, the A. version (with ref) is called for both cases and if the A is eliminated, only the 2. foreach loop will compile ? The second case works as i expected but what about the first case - the B. function won't be called ever ? Furthermore, i wanted to create a const iterator class Foo { int opApply( int delegate(ref real) dg ) {...} //A. const int opApply( int delegate(real) dg ) {...} // B, } ... Foo foo = new Foo; const Foo f2 = foo; foreach( a; f2 ) {...} // 1. foreach( ref a; foo ) {...} // 2, It won't compile. (dmd 2.032) (I expected that, for the 1. loop the B version and for the 2. loop the A version of the functions'd be called) So what is the D way to create const iterator ?