The -> (arrow) operator is used to access structure or union members using a pointer. A postfix expression, followed by an -> (arrow) operator, followed by a possibly qualified identifier, designates a member of the object to which the pointer points. The postfix expression must be a pointer to an object of type struct or union. The name must be a member of that object.
The value of the expression is the value of the selected member. If the name is an lvalue, the expression value is also an lvalue. If the expression is a pointer to a qualified type, the same type-qualifiers will apply to the designated member in the resulting expression.