We need to have a way to say "convert this nested function into a struct"

[Jonathan M Davis via Digitalmars-d]

On Saturday, 6 June 2015 at 13:44:51 UTC, Jacob Carlborg wrote:
> On 2015-06-06 08:59, Jonathan M Davis wrote:
>> On Saturday, 6 June 2015 at 06:16:17 UTC, Andrei Alexandrescu 
>> wrote:
>>> Nested functions that allocate their environment dynamically 
>>> can be
>>> quite useful. However, oftentimes the need is to convert the 
>>> code plus
>>> the data needed into an anonymous struct that copies the 
>>> state inside,
>>> similar to C++ lambdas that capture by value.
>>>
>>> I wonder how to integrate that within the language nicely.
>>
>> Some of us were discussing this at dconf. Essentially, we need 
>> a way to
>> create a functor similar to how C++ lambdas do. The most 
>> straightforward
>> way would involve string mixins, and you'd do something like
>>
>> auto f = makeFunctor!"function code here"(arguments);
>
> Which could look like this with AST macros ;)
>
> auto f = makeFunctor(args) {
>    function code goes here, no strings are needed
> }

That may be, but Walter and Andrei have definitively said that 
we're never getting AST macros, so there isn't really in point in 
worrying about what could be done with them.

- Jonathan M Davis