How can we write a function to swap two enum variables?

Question

How can we write a function which swap enum variables?

Also are these variables standard and working with them doesn't matter in a project? How do C++ complier use them and put them in the RAM?

Answer 1

Use std::swap :

enum Foo {
    CAT,
    DOG,
    ELEPHANT
};

Foo a = CAT;
Foo b = ELEPHANT;

std::swap(a, b);

std::cout << (a == ELEPHANT) << "\n";

enum is perfectly standard; they are equivalent to integer types.

Answer 2

You don't need to write a swap function, std::swap works out of the box.

enum is standard C++. enum values are represented as an integer type in memory, by default as an int . You can change this representation (in C++11) with, eg

enum Foo : short { A, B, C };

Answer 3

确实，只需使用std::swap(....) 。