Re: [boost] a (useful?) crtp trick

Subject: Re: [boost] a (useful?) crtp trick
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-08-28 08:21:01

On 26/08/2012 14:28, pavel wrote:
>   Mathias wrote on Saturday, August 25, 2012 at 19:31:53:
>> What's the advantage over
>
>> template<class T>
>> struct tag_of;
>
>> template<class Derived>
>> struct Base
>> {
>>     typedef typename tag_of<Derived>::type tag;
>> };
>
>> struct Foo : Base<Foo>
>> {
>> };
>
>> template<>
>> struct tag_of<Foo>
>> {
>>     typedef void type;
>> };
>
> thanks for the question
>
> the advantage is that you may completely ignore the tag as in
>
>    template<typename type>
>    void f(const Base<type>&);

This is also possible with the code above, since the tag is not part of 
the template parameters of Base.