/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <vector>#include <iostream>#include <cstdlib>// wrapper for function pointers to function objectstemplate<int (*FP)()>class FunctionReturningIntWrapper {  public:    int operator() () {        return FP();    }};// example function to wrapint random_int(){    return std::rand();  // call standard C function}// client that uses function object type as template parametertemplate <typename FO>void initialize (std::vector<int>& coll){    FO fo;  // create function object    for (std::vector<int>::size_type i=0; i<coll.size(); ++i) {        coll[i] = fo();  // call function for function object    }}int main(){    // create vector with 10 elements    std::vector<int> v(10);    // (re)initialize values with wrapped function    initialize<FunctionReturningIntWrapper<random_int> >(v);    // output elements    for (std::vector<int>::size_type i=0; i<v.size(); ++i) {        std::cout << "coll[" << i << "]: " << v[i] << std::endl;    }}