[Development] C++11 decltype magic with a container?

[Thiago Macieira]

On terça-feira, 21 de maio de 2013 20.27.41, Stephen Kelly wrote:
> For a Qt patch, I need to know at compile-time whether std::find can be
> used  with it, ie, whether the value_type of the container can be
> equality-compared.
> 
>  https://codereview.qt-project.org/#change,55735
> 
> I used a decltype, which works for the type itself, but not for the
> container.  I also tried an enable_if, but that doesn't solve the problem
> either.

Let's go back a step.

What are you trying to do?

And what types of a container aren't comparable? All containers require 
comparison in order to implement find() and constFind(); I think the 
associative containers require it in some more situations.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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