what is the difference between template and mixin template

[Artur Skawina]

On 06/10/12 19:45, Zhenya wrote:
> On Sunday, 10 June 2012 at 17:34:19 UTC, Zhenya wrote:
>> I read in documentation,that we have two ways to use mixin statement.
>> 1st: mixin(string_wich_can_be_evaluated_at_compile_time);
>> 2st:mixin template
>> I could'nt find any information about such way to use it
> 
> Also,in this case if we add "mixin" before template nothing will change.
> So I would be grateful if you gave me some example,that help me see the difference,becouse now I think that mixin templates is subset of regular templates

A "normal" template just adds one or more compile-time parameters to a
declaration. Which lets you acccess it as "template_name!(int)" and
"template_name(double)" and the result is the same as if you had written
the contents of template twice, once for ints and another copy for "double".
Nothing more, every "template_name!(int)" refers to the same instance, which
remains in the scope where it is defined.

When you write "mixin template_name!(int)" then that templates content is
copied instead, just if you copy-and-pasted it from where it's defined into
the current scope and substituted "int" for the parameter.

The compiler will also let you mixin a "normal" template, which is then
treated just like it was a mixin-template, which may be confusing at first;
this is why your program didn't fail to compile.
The other way won't work BTW, you cannot use a mixin-template w/o mixin it
in. 

artur