Where are the template members?

[Simen Kjaeraas]

On 2012-39-05 09:12, Gor Gyolchanyan <gor.f.gyolchanyan at gmail.com> wrote:

> Consider this piece of code:
>
> struct Test
> {
> template member(Type)
> {
> Type member;
> }
> }
>
> unittest
> {
> Test test;
> test.member!int = 0;
> test.member!long = 0;
> test.member!short = 0;
> import std.stdio; writeln(test.sizeof);
> assert(test.sizeof == int.sizeof + long.sizeof + short.sizeof); // fails
> assert(test.sizeof == 1); // succeeds
> }
>
> I don't get why the structure's size remains unchanged even after
> instantiating 3 members inside it.
> How can I get the real size of the structure, including all its members
> (template or not)?

You have. Its real size is 1, and the template instantiations are not  
member
fields.

A template (not a templated function [actually, sorta, but that's a  
different
discussion]) is basically static - if you try instead Test.member!int, you
will see that this works perfectly.

What we see here is another example of the confusion that can be caused by
static names being accessible through an instance:

struct Foo {
     static int n;
}

Foo f;

f.n = 4;

-- 
Simen