[Boost-users] Runtime identity

Subject: [Boost-users] Runtime identity
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2010-11-30 10:06:43

I'm not sure if this is a stupid question, but is there a runtime equivalent
of boost.mpl's identity
metafunction?

Something that just returns it's single argument, eg.,

template <typename T> T identity( T t ) { return t; }

I think it's trivially simple to write, but I wonder if it already exists in
Boost or
indeed the STL?

(I need this because I need to pass a function object which simply returns
an
object I already have - maybe I've missed a more obvious method?)

Thx,

Rob.