General:
FC++ is useful for its handling of function objects in a general
setting. The FC++ way of saying things is often more succinct than
boost::bind or the standard library:
FC++ STL/boost::bind
==== ===============
fcpp::plus std::plus<int>()
minus(_,3) std::bind2nd( std::plus<int>(), 3 )
minus(_,3) boost::bind( std::plus<int>(), _1, 3 )
though for a number of small cases,
boost::lambda provides the
tiniest code:
FC++ boost::lambda
==== =============
minus(_,3) _1 - 3
FC++'s lambda syntax is explicit, which sometimes makes it easier to
create complicated functions on the fly. Here is a somewhat contrived
example (loosely based on a thread on the Boost mailing list):
void g( std::string s, int x );
void h( fcpp::fun0<void> f );
...
fcpp::fun1<int,void> f =
lambda(X)[ ptr_to_fun(h)[
lambda()[ ptr_to_fun(g)[ std::string("hi"), X ]
] ] ];
which is relatively straightforward to express using FC++, but difficult
to express using boost::{lambda,function,bind}.
