Ok, thanks :) I was looking for a gil concept. You are right, I am trying to do some SFINAE, now it works well :) I am trying to do some channel merging with templated functors (one which uses alpha and another which doesn't). If you are interested by the code (LGPL) I have made, I can send you what I have done. Maybe are you interested by adding such functions in a future version of gil ? I give you two files that shows the principle. I don't know if that will be usefull to you, anyway I think it's an interesting feature to put in gil. (the files I give to you is subject of bugs: it is under development). Eloi. 2009/12/2 Christian Henning <chhenning@gmail.com>
Eloi,
I would do something like that (not tested): BOOST_STATIC_ASSERT(mpl::contains<typename color_space_type<Pixel>::type, alpha_t>::value);
This works just fine.
But I don't know if it is a good idea. Is there a way to do that with gil_function_requires ?
You mean by adding a new concept to gil? I would just go with the metafunction you provided above. What are you trying to do? Some SFINAE?
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