More generic for_each_tuple

Problem In one of previous posts (Readable for_each loop for maps) I have written such code which iterates over range of pairs and “explode” them into the lambda arguments list:

template <typename Range, typename Fun> 
void map_for(const Range& range, Fun f)
{     
    for(const auto& e : range)
        f(e.first, e.second);
}

template <typename Range, typename Fun>

void map_for(const Range& range, Fun f)

{

for(const auto& e : range)

f(e.first, e.second);

}

This code is good but it is limited only to containers with pairs (types with defined first and second attributes). What we would like to have… Read More

Generic function which sum up elements from given container

Junior task – sum of integers in vector Assume that we have vector of integers ie.

auto numbers = std::vector<int>{1,4,7,9,3,4,5};

1	auto numbers = std::vector<int>{1,4,7,9,3,4,5};

and we want to write function which will sum up all its elements.

int sum(const std::vector<int>& numbers)
{
    return std::accumulate(numbers.begin(), numbers.end(), 0);
}

int sum(const std::vector<int>& numbers)

{

return std::accumulate(numbers.begin(), numbers.end(), 0);

}

In which cases it will work?

sum(numbers); // works - result 33
sum(std::vector<int>{1,4,7,9,3,4,5}); // works
sum({1,4,7,9,3,4,5}); // works
sum(std::vector<double>{1,4,7,9,3,4,5}); // don't work

sum(numbers); // works - result 33

sum(std::vector<int>{1,4,7,9,3,4,5}); // works

sum({1,4,7,9,3,4,5}); // works

sum(std::vector<double>{1,4,7,9,3,4,5}); // don't work

Middle task – sum of elements in vector no matter what type Let’s make it more generic… Read More