What is the purpose of std::make_pair vs the constructor of std::pair?

Question

What is the purpose of std::make_pair?

Why not just do std::pair(0, \'a\')?

Is there any difference between the tw

Answer 1

There is no difference between using make_pair and explicitly calling the pair constructor with specified type arguments. std::make_pair is more convenient when the types are verbose because a template method has type deduction based on its given parameters. For example,

std::vector< std::pair< std::vector<int>, std::vector<int> > > vecOfPair;
std::vector<int> emptyV;

// shorter
vecOfPair.push_back(std::make_pair(emptyV, emptyV));

 // longer
vecOfPair.push_back(std::pair< std::vector<int>, std::vector<int> >(emptyV, emptyV));