Melasma Treatment and Hormones. Melasma is a condition that involves the discoloration of the skin usually on the face. Melasma is a result of too much exposure to sunlight. Melasma patches appear on the nose, lips, upper cheek, upper lip and the forehead. It mostly occurs in women than men. Genetic predisposition and hormonal imbalance plays a major role to determine if one will develop Melasma or not.
std::bind. std::bind is a Standard Function Objects that acts as a Functional Adaptor i.e. it takes a function as input and returns a new function Object as an output with with one or more of the arguments of passed function bound or rearranged.
std :: bind. Return type. Member type result_type. 1) If F is a pointer to function or a pointer to member function, result_type is the return type of F. If F is a class type with nested typedef result_type, then result_type is F::result_type. Otherwise no result_type is defined. 2) result_type is exactly R.