KSG-Framework/Either.h

#pragma once

#include <functional>
#include "Betriebssystem.h"

namespace Framework
{
    template<typename A, typename B>
    class Either
    {
    private:
        A aValue;
        B bValue;
        bool a;

    public:
        Either( const Either<A, B>& b )
        {
            a = b.isA();
            if( a )
                aValue = (A)b;
            else
                bValue = (B)b;
        }

        Either( A a )
        {
            aValue = a;
            this->a = 1;
        }

        Either( B b )
        {
            bValue = b;
            a = 0;
        }

        bool isA() const
        {
            return a;
        }

        bool isB() const
        {
            return !a;
        }

        A getA() const
        {
            return aValue;
        }

        B getB() const
        {
            return bValue;
        }

        void doIfA( std::function<A> action )
        {
            if( a )
                action( aValue );
        }

        void doIfB( std::function<B> action )
        {
            if( !a )
                action( bValue );
        }

        operator A() const
        {
            assert( a );
            return aValue;
        }

        operator B() const
        {
            assert( !a );
            return bValue;
        }
    };
}