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==[[C plus plus|C++]]==
[[Category:C plus plus]]
===for_each ===
'''Compiler:''' [[GCC]] 4.1.1
#include <iostream> // std::cout, std::endl
#include <vector> // std::vector
#include <algorithm> // std::for_each
struct sum
{
int _sum;
sum() : _sum(0) {}; // Initialize sum with 0;
void operator() (int a) { _sum += a; } // this function will be called for every element
};
int main()
{
std::vector<int> v;
v.push_back(10);
v.push_back(23);
v.push_back(34);
/* Note that for_each gets a fresh instance of sum passed,
* applies every element beginning with *v.begin() up to,
* but not including v.end() to the function object
* and returns a copy of it.
*/
sum the_sum = std::for_each(v.begin(), v.end(), sum());
std::cout << "The sum is " << the_sum._sum << std::endl;
return 0;
}
''Where does the above fit in?''
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