On Sat, 03 Jan 2015 15:56:58 +1030 ted via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
> Ironically, I'm trying to use const in an effort to understand it...but > there seems to be an unusual amount of pain until I grok it. just remember that `const` "infects" everything down to the bytes when it's applied. and it's forbidden to overwrite `const` vars with different values. in your canse it "infects" your `A` struct, effectively converting it to `const A` (with `const int someInt`). and as you can't change "consted" value, and structs are `memcpy()`ed... compiler tracked that down and refused to do it. so you don't really need `const` fields in D. you can make getters `const` though, so that they can be used on `const MyStruct` instances. so two rules should help you here: 1. it's forbidden to overwrite `const` vars with new values. 2. `const` will infect everything down to bytes. maybe this will help you like it helps me. ;-)
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