Introduction to C++ Operator Overloading

CS202 6- ‹#›

Overloading +, +=Operators

nIf the + operator is overloaded, we should also overload the += operator

nThe + operator can take either a string or a char * as the first or second operands, so we will overload it as a non-member friend and support the following:

ästring + char *, char * + string, string + string

nFor the += operator, the first operand must be a string object, so we will overload it as a member

nThe + operator results in a string as an rvalue temp

nThe += operator results in a string as an lvalue

nThe + operator doesn’t modify either operand, so string object should be passed as constant references