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

make_pair creates an extra copy over the direct constructor. I always typedef my pairs to provide simple syntax.
This shows the difference (example by Rampal Chaudhary):

class Sample
{
    static int _noOfObjects;

    int _objectNo;
public:
    Sample() :
        _objectNo( _noOfObjects++ )
    {
        std::cout<<"Inside default constructor of object "<<_objectNo< map;

    map.insert( std::make_pair( 1, sample) );
    //map.insert( std::pair( 1, sample) );
    return 0;
}