35 lines
596 B
C++
35 lines
596 B
C++
|
A function object that computes an integer sum.
|
||
|
|
#include <iostream>
|
||
|
|
#include <vector>
|
||
|
|
#include <algorithm>
|
||
|
|
#include <functional>
|
||
|
|
using namespace std;
|
||
|
|
|
||
|
|
class sum : unary_function<int, void> {
|
||
|
|
public:
|
||
|
|
argument_type sum;
|
||
|
|
|
||
|
|
sum() { sum = 0; }
|
||
|
|
|
||
|
|
result_type operator()(argument_type i) {
|
||
|
|
sum += i;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
vector<int> v;
|
||
|
|
|
||
|
|
for(int i=1; i < 11; i++) v.push_back(i);
|
||
|
|
|
||
|
|
for(unsigned i=0; i < v.size(); ++i){
|
||
|
|
cout << v[i] << endl;
|
||
|
|
}
|
||
|
|
sum s;
|
||
|
|
|
||
|
|
s = for_each(v.begin(), v.end(), sum());
|
||
|
|
cout << "sum of v: " << s.sum << endl;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|