Re: STL map containing pointer_to_binary_function

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Tue, 28 Aug 2007 16:10:59 -0400

Message-ID:

<fb1vgh$c6r$1@news.datemas.de>

Glennmac@gmail.com wrote:

I am beating my head against the wall trying to figure out how to make
this work.

I have a map which contains a string as the key and I want the data to
be a pointer_to_binary_function, but at the time of map definition, I
don't know the types.

Then you don't have an object. There is no way around it, if you want
to define an object, you need to give it a concrete type.

So really the map contains a templatized
pointer_to_binary_function.

That's nonsense, sorry.

When I actually add to the map is where I
know the types of the binary function.

If you know it when you want to add, you should be able to know it
when you construct your map. It all happens while you're coding.

Adding to the map:

mMap.insert("test", ptr_fun(not_equal_to<int>));

Fails with: error: expected promary-expression before ')' token

I am at a loss here.

One like of code is *not enough* to understand how to get you back on
track. Please explain the problem you're trying to solve.

V
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