Allow empty field function arguments for default?

[Jacob Carlborg]

On 2012-04-19 20:34, Jacob Carlborg wrote:
> On 2012-04-19 16:13, ixid wrote:
>> I put this here because it's probably a flawed idea. A 'learn' level
>> suggestion.
>>
>> At present function arguments that you want to default must go at the
>> end like so:
>>
>> int fun(int a = 1, int b = 2, int c = 3)
>> {
>> return a + b + c;
>> }
>>
>> fun(4); //Modifies a
>>
>> where the default fields can only be fields after any argument provided.
>> Why not allow something like:
>>
>> fun( , 4, ); //Modifies b
>> fun( , , 5); //Modifies c
>>
>> for when you want to call fun with other fields not being default? This
>> would seem more flexible and pretty clear what is intended.
>
> Named arguments would probably be better for this.
>
> fun(c = 5);
>

Which is actually possible to emulate:

callWithNamedArguments(fun, "c=5");

See:

https://github.com/jacob-carlborg/orange/blob/master/orange/util/Reflection.d#L135

-- 
/Jacob Carlborg