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

Because bar contains a std::vector, not a std::vector *.

It's really no different to something like this:

class bar
{
    int foo;  // No need to create a "new int"
};