better-enums/doc/tutorial/6-iostreams.md

Stream operators

These work almost as you'd expect. First, make sure you include iostream before enum.h in any translation unit in which you intend to use the operators:

#include <iostream>
#include <enum.h>

<em>ENUM(Channel, int, Red, Green, Blue)</em>

int main()
{
    std::cout << <em>+Channel::Red</em> << std::endl;
    return 0;
}

The thing to watch for is the +: without it, Channel::Red is a value of type Channel::_enumerated, a $cxx98 enum type, so writing that to cout will output an integer. +Channel::Red, however, is a value of type Channel, and writing that instead will output the string "Red".

Input is also supported:

Channel     channel = Channel::Blue;
std::cin >> channel;    // Expects input such as "Green".

---

Only char streams are supported for the time being.

%% description = Using Better Enums with stream input and output operators.