Question

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sum of elements in a std::vector

I have std::vector<int> and I want to calculate the sum of all the values in that vector.
Is there any built in function or I need to write my custom code?

Answer 1

Use the STL algorithm std::accumulate, in the numeric header.

#include <numeric>

    // ...
    std::vector<int> v;
    // ...
    int sum = std::accumulate(v.begin(), v.end(), 0);