#include <iostream>
#include <vector>
 
template<typename Iter, typename Func>
void combine_pairwise(Iter first, Iter last, Func func)
{
    for(; first != last; ++first)
        for(Iter next = std::next(first); next != last; ++next)
            func(*first, *next);
}
 
int main() {
	std::vector<float> v {5120.2, 5140.2, 5500.2, 5482.0, 5802.2};
	std::vector<float> result;
 
	auto op = [&](const float&f1, const float&f2){result.push_back(f1-f2);};
	combine_pairwise(v.begin(), v.end(), op);
 
	for (auto f : result)
	{
		std::cout << f << std::endl;
	}
	return 0;
}

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