[Cs3] bind, lambda and function pointers

[Mikhail Nesterenko]

CS3 students,

It turns out that std::bind and (in general) lambda definition do not
produce function pointers. Even though a lambda without captured
variables may be represented as a function pointer. What bind/lambda
produce is implementation dependent. And having "auto" as a type is a
good way of referring to the return value of bind and lambda definition.
For example:

    auto newf = bind (myfunc, _1, _2);

However, C++11 has a mechanism of treating function
pointers/functors/bind results/lambdas with the same signatures
similarly. It is called std::function and is defined in <functional>
header file.

I came up with an example:

  http://vega.cs.kent.edu/~mikhail/classes/cs3/Examples/STLAlgorithms/Functors/function.cpp

Where I set up a vector of point-able objects that are then treated uniformly.

Please take a look,
-- 
Mikhail