remove_if(b, e, p);

• arranges container so that the elements in range [b,e) all have p(elem) return false.

• remove each element in range [b,e) for which unary predicate p(elem) is true.

• DOES NOT CHANGE SIZE OF CONTAINER.

• Shifts other values to left to cover one removed.

• Returns an iterator pointing one past the last "valid" element.

• see remove1.cpp for example.