I have been looking at this problem for a day now but I cannot seem to find the answer. I need to use and to add all of the elements of a vector.
So far I found http://www.cplusplus.com/reference/functional/plus/ Is it possible to instead of adding 2 vector add its elements together? I can't find anything else that even comes close to doing what I want to do.
By the way I am new to the language. I don't need the code but just a hint in the right direction.
The algorithm to preform this operation is in the <numeric> header, not in the <algorithm> header. See std::accumulate.
#include <iostream>
#include <numeric>
#include <vector>
int main()
{
std::vector<int> data = {1, 2, 10};
const auto result = std::accumulate(data.begin(), data.end(), 0);
std::cout << result << std::endl;
return 0;
}
If you insist on using functional and <algorithm> you could use std::for_each and std::function.
#include <algorithm>
#include <iostream>
#include <functional>
#include <vector>
int main()
{
std::vector<int> data = {1, 2, 10};
int result = 0;
std::function<void(int)> sum = [&result](int value){result += value;};
std::for_each(data.begin(), data.end(), sum);
std::cout << result << std::endl;
return 0;
}
std::accumulate<algorithm>and<functional>are used we may be able to help you furthe<functional>and<algorithm>.