Hello. I still haven't wrapped my mind around the const/immutable thing yet and am still stuck in C/C++ mode. :-(
A function that takes mutable arguments cannot be called with immutable input at the call site since it does not promise to *not* mutate the input. That's of course clear. Why can't a function that takes an immutable argument be called with a mutable input at the call site? IOW, why isn't mutable implicitly convertible to immutable? I just finished writing a string processing module which calls multiple subroutines, and all of them carrying arguments with type `string` viz. `immutable(char)[]` IIUC, and I tried to pass it something which came from File.byLine(), then got the error: function textattr.applyTextAttr (string text) is not callable using argument types (char[]) I understand that const can refer to either mutable or immutable, so does this mean I should replace all occurrences of `string` in arguments and return values of functions by `const(char)[]`? -- Shriramana Sharma, Penguin #395953
