AMDG On 03/09/2011 03:26 PM, er wrote:

Is there a variant of this

int i = 0; lambda::var( i )++;

in which I can do away with the external variable, i? In other words, a nullary functor that returns 0, 1, 2, successively?

No. Remember that function objects are copyable. The state needs to be stored separately to avoid problems. In Christ, Steven Watanabe

On 9 Mar 2011, at 23:26, er wrote:

Hello,

Is there a variant of this

int i = 0; lambda::var( i )++;

in which I can do away with the external variable, i? In other words, a nullary functor that returns 0, 1, 2, successively?

You could write one, something like (not compile tested!) struct Counter { boost::shared_ptr<int> ptr; Counter() : ptr(new int(-1)) {} int operator()() { *(ptr)++; return *ptr; } };