On Thu, 20 Jun 2019, Ryan Joseph wrote:
I just had some plans for a cool JSON class thwarted because apparently []
properties don’t allow overloading of the parameters. Can we allow
multiple default properties as long as their parameters are different? I
know there’s not overloading of property names but at least the parameters
could be overloadable so the correct property is chosen depending on what
the args are.
type
TMyClass = class
function GetValueWithInt(index: integer): TValue;
function GetValueWithString(index: string): TValue;
property IndexI[index: integer]: TValue read GetValueWithInt; default;
property IndexS[index: string]: TValue read GetValueWithString; default;
end;
o := c[index]; // IndexI wins
o := c[‘key’]; // IndexS wins
IMHO this goes contrary to what the word 'default' means. There can be only
1 default.
That said, allowing overloading of array properties based on index type has
been on my wish list since a long time.
So
property Values[index: integer]: TValue read GetValue;
property Values[index: string]: TValue read GetValue;
would be a nice addition.
Since the Values array is then uniquely named, 'Default' makes sense again.
Michael.
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