source: libcfa/src/enum.hfa @ bc48c0d

#pragma once

#include "iostream.hfa"

forall( E ) trait Bounded {
    E lowerBound();
    E upperBound();
};

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

// Design one
forall( E, V | Serial( E ) ) trait CfaEnum {
    char * label( E e );
    unsigned int posn( E e );
    V value( E e );
};

// I/O

forall( istype & | istream( istype ), E, V | CfaEnum( E, V ) )
istype & ?|?( istype &, E & );

forall( ostype & | ostream( ostype ), E, V | CfaEnum( E, V ) ) {
        ostype & ?|?( ostype &, E );
        OSTYPE_VOID( E );
}

forall( ostype & | ostream( ostype ), E | CfaEnum( E, quasi_void ) ) {
        ostype & ?|?( ostype &, E );
        OSTYPE_VOID( E );
}

// Design two <- should go for this if we have change the cost model
// forall( E | Serial( E ) ) trait CfaEnum {
//     char * label( E e );
//     unsigned int posn( E e );
// };

// forall( E, V| CfaEnum( E)) trait TypedEnum {
//     V value( E e);
// };

forall( E, V | CfaEnum( E, V ) ) {                                              // relational operators
    int ?==?( E, E );
    int ?!=?( E, E );
    int ?<?( E, E );
    int ?<=?( E, E );
    int ?>?( E, E );
    int ?>=?( E, E );

    int ++?( E &);
    int ?++( E &);
    int --?( E &);
    int ?--( E &);
}