public Expression MakeTestForTypes(Type[] types, int index)
{
Expression test = MakeTypeTest(types[index], index);
if (index < types.Length - 1)
{
Expression nextTests = MakeTestForTypes(types, index + 1);
if (ConstantCheck.Check(test, true))
{
return(nextTests);
}
else if (ConstantCheck.Check(nextTests, true))
{
return(test);
}
else
{
return(Ast.AndAlso(test, nextTests));
}
}
else
{
return(test);
}
}
internal static bool CanAssign(Type to, Expression from) {
if (CanAssign(to, from.Type)) return true;
if (to.IsValueType() &&
to.IsGenericType() &&
to.GetGenericTypeDefinition() == typeof(Nullable<>) &&
ConstantCheck.Check(from, null)) {
return true;
}
return false;
}