C++ ends up with three forms (of course it does): Normal C style declaration int foo() { return 2; } Trailing return type. Useful when the return type de

C++ ends up with three forms (of course it does): Normal C style declaration int foo() { return 2; } Trailing return type. Useful when the return type depends on the parameter types, or is inside the namespace of the function auto foo() -> int { return 2; } Automated type deduction. Increasingly the choice when possible auto foo() { return 2; }