Re: [Boost-users] Using bind / lambda to create a functor that (1)ignores arguments, and (2) returns a constant

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-09-02 12:38:38

Stephen Gross wrote:
> Is there a way to use bind and/or lambda to create a functor that:
> 
> (1) Takes as input a single argument (that is ignored), and
> (2) Returns a constant value.
> 
> Ideally, something along the lines of:
> 
> bind(constant(5), _1) // _1 is passed but ignored.

Using boost::bind:

    boost::bind( identity<int>(), 5 )

where identity returns its argument.

Using lambda:

(_1, 5)