source: libcfa/src/enum.hfa@ 0843ba6

#pragma once

forall(T) { // T is the based type of enum(T)
    forall(E) trait Bounded {
        E lowerBound();
        E upperBound();
    };

    forall(E| Bounded(E, T)) trait Serial {
        unsigned fromInstance(E e);
        E fromInt(unsigned i);
        E succ(E e);
        E pred(E e);
    };

    // Opague Enum + TypedEnum
    forall(E | Serial(E, T)) trait CfaEnum { 
        char * labelE(E e);
        unsigned int posE(E e);
    };

    forall(E | CfaEnum(E, T)) trait TypedEnum {
        T valueE(E e);
    };

    forall(E | TypedEnum(E, T)) {
        // comparison
        int ?==?(E l, E r);
        int ?!=?(E l, E r);
        int ?!=?(E l, zero_t);
        int ?<?(E l, E r);
        int ?<=?(E l, E r);
        int ?>?(E l, E r);
        int ?>=?(E l, E r);

        // for testing; To be removed
        // char * typeEnumString(E e);
        char * typeEnumString(E e);
    }
}