public MaybeMonad <TTo> BindM <TTo>(Func <T, MaybeMonad <TTo> > f)
{
if (isNothing)
{
return(MaybeMonad <TTo> .Nothing());
}
var newM = f(value);
return(newM);
}
public void change(int diff)
{
// if current capacity is out of range
// the container will be broken and not working
var capaM = currentCapa.BindM(capa => {
if (capa + diff < 0 || capa + diff > capacity)
{
return(MaybeMonad <int> .Nothing());
}
else
{
return(MaybeMonad <int> .Return(capa + diff));
}
});
currentCapa = capaM;
}
public Container(int capacity)
{
this.capacity = capacity;
currentCapa = new MaybeMonad <int>(0);
}