Re: [Boost-users] template concept question

Subject: Re: [Boost-users] template concept question
From: Igor R (boost.lists_at_[hidden])
Date: 2010-03-09 08:29:29

> Can I ask inside a template function if a member exists on a parameter of
> the function.
>
> For example.
>
> template <typename T>
> void func(T in)
> {
> exists(in, foo);
> }
>
> Where the "exists" line would return true if "in" had a member "foo"
> otherwise false.

Note, however, that "introspection" libarary cannot detect an inherited member.
If you use MSVC and don't need a portable code, you can use
__if_exists statement:
http://msdn.microsoft.com/en-us/library/x7wy9xh3(VS.80).aspx