enum VS static immutable

[w0rp]

On Thursday, 13 March 2014 at 14:38:27 UTC, ref2401 wrote:
> Hi.
> I have this structure:
>
> struct MyStruct {
> 	enum MyStruct VALUE = MyStruct(5f);
>
> 	static immutable MyStruct value = MyStruct(5f);
>
>
> 	float data;
>
> 	this(float v) { data = v; }
> }
>
> What's the difference between MyStruct.VALUE and 
> MyStruct.value? How should I decide what to use?

enum is a compile-time constant. 'static immutable' is an 
immutable (and therefore implicitly shared between threads...) 
runtime constant that isn't part of the struct itself. I'd stick 
with enum and switch to static when what you're writing becomes 
impossible to express at compile-time. A surprising number of 
things can actually be expressed at compile-time.