Why doesn't C++ require a “new” statement to initialize std::vector?

Question

/* bar.h */
class bar{
    /* standard stuff omitted */
    std::vector foo;
};

/* bar.cpp */
bar::bar(){ 
    // foo = new std::vector();         


        

Answer 1

std::vector foo is different from std::vector *foo. The second case will require you to use new while the first wll not.