private static int Compare <T>(OverloadResolutionCandidate <T> x, OverloadResolutionCandidate <T> y, int argumentCount)
where T : Signature
{
var betterConversionsInX = 0;
var betterConversionsInY = 0;
for (var i = 0; i < argumentCount; i++)
{
var cX = x.ArgumentConversions[i];
var tX = x.Signature.GetParameterType(i);
var cY = y.ArgumentConversions[i];
var tY = y.Signature.GetParameterType(i);
var comparison = Conversion.Compare(tX, cX, tY, cY);
if (comparison < 0)
{
betterConversionsInX++;
}
else if (comparison > 0)
{
betterConversionsInY++;
}
}
// NOTE: The roles are reversed here.
return(-betterConversionsInX.CompareTo(betterConversionsInY));
}
private static void GetBestAndSelectedCandidate <T>(IEnumerable <OverloadResolutionCandidate <T> > candidates, out OverloadResolutionCandidate <T> best, out OverloadResolutionCandidate <T> selected)
where T : Signature
{
best = null;
selected = null;
foreach (var candidate in candidates.Where(c => c.IsSuitable))
{
if (best == null)
{
best = selected = candidate;
}
else
{
best = null;
return;
}
}
}
private static bool IsApplicable <T>(OverloadResolutionCandidate <T> candidate, int argumentCount)
where T : Signature
{
return(candidate.Signature.ParameterCount == argumentCount &&
candidate.ArgumentConversions.All(c => c.IsImplicit));
}
public OverloadResolutionResult(OverloadResolutionCandidate <T> best, OverloadResolutionCandidate <T> selected, IEnumerable <OverloadResolutionCandidate <T> > candidates)
{
Best = best;
Selected = selected;
Candidates = candidates.ToImmutableArray();
}