/*
Determine which BinOpSig is better for overload resolution.
Better means: at least as good in all Params, and better in at least one param.
Better w/r to a param means:
1) same type as argument
2) implicit conversion from this one's param type to the other's param type
Because of user defined conversion operators this relation is not transitive.
Returns negative if ibos1 is better, positive if ibos2 is better, 0 if neither.
*/
private int WhichBofsIsBetter(BinOpFullSig bofs1, BinOpFullSig bofs2, CType type1, CType type2)
{
BetterType bt1;
BetterType bt2;
if (bofs1.FPreDef() && bofs2.FPreDef())
{
// Faster to compare predefs.
bt1 = WhichTypeIsBetter(bofs1.pt1, bofs2.pt1, type1);
bt2 = WhichTypeIsBetter(bofs1.pt2, bofs2.pt2, type2);
}
else
{
bt1 = WhichTypeIsBetter(bofs1.Type1(), bofs2.Type1(), type1);
bt2 = WhichTypeIsBetter(bofs1.Type2(), bofs2.Type2(), type2);
}
int res = 0;
switch (bt1)
{
default:
VSFAIL("Shouldn't happen");
break;
case BetterType.Same:
case BetterType.Neither:
break;
case BetterType.Left:
res--;
break;
case BetterType.Right:
res++;
break;
}
switch (bt2)
{
default:
VSFAIL("Shouldn't happen");
break;
case BetterType.Same:
case BetterType.Neither:
break;
case BetterType.Left:
res--;
break;
case BetterType.Right:
res++;
break;
}
return res;
}
