Bit Flags for enum classes

Synopsis

This header-only library introduces a flag_set class template which provides bit flags for enum classes.

Motivation

While enum classes are great in that they are strongly typed and do not implicitly cast to the underlying type, we cannot use the bitwise operators directly out of the box because of this. So, we would like to define bitwise operators on some type and have our type safety still.

The flag_set<EnumType> class template introduces this exact strong type and defines bitwise operators on the underlying values the container holds.

Code Example

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#include <utility>

#include "flag_set.hpp"

enum class ExampleEnumClass
{
    One = 1,
    Two = 1 << 1
};
USE_FLAGS_FOR_ENUM(ExampleEnumClass);

int main()
{
    constexpr auto mask = ExampleEnumClass::One | ExampleEnumClass::Two;
    if constexpr(mask)
    {
        // Do something :)
    }

    return EXIT_SUCCESS;
}