Lambda

#include <iostream>
#include <functional>
#include <vector>

template<class T>
std::function<T (T)> makePipeline(const std::vector<std::function<T (T)>>& funcs) {
    return [&funcs] (const T& arg) {
       /*Your code goes here*/
    };
}

#ifndef RunTests
int main()
{
    std::vector<std::function<int (int)>> functions;
    functions.push_back([] (int x) -> int { return x * 3; });
    functions.push_back([] (int x) -> int { return x + 1; });
    functions.push_back([] (int x) -> int { return x / 2; });

    std::function<int (int)> func = makePipeline(functions);
    std::cout << func(3); // should print 5
}
#endif