On Tue, Nov 30, 2010 at 3:20 PM, Steven Watanabe <watanabesj@gmail.com>wrote:
AMDG
On 11/30/2010 7:06 AM, Robert Jones wrote:
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?)
boost::lambda::_1?
Thx Steven - as usual exactly the right answer to the question. I however have realised I'm asking completely the wrong question. What I in fact want to do is to create on the fly a nullary function object which returns a constant value. Possibly this is what lambda::constant does? Thx, Rob.