ETL Functional How to use?

[pinwhell]

i see, ETL has etl::function, but how to use it? STL ones allows to "copy construct" a with a lambda for example

std::function<...> = []{};

what could be the equivalent for ETL?

[jwellbelove]

The ETL has two types of delegates, etl::function & etl::delegate. etl::function has no connection with std::function and has now been deprecated (it will eventually be removed).

etl::delegate is its replacement. etl::delegate can handle lambdas to a limited extent. The lambda is passed as a reference and its lifetime must exist for the lifetime of the delegate. This is because the etl::delegate does not allocate any storage for the lambda. std::function can copy as it will allocate memory from the heap in which to store it, but as the ETL has a 'no dynamic memory' rule, this cannot be done for etl::delegate.

I have an API compatible ETL version of std::function on an experimental branch, but it has the same dynamic memory limitations. I have not added it to the main branch, as I don't see that is has any real advantages over etl::delegate.

In fact etl::delegate has some advantages over std::function in that etl::delegate objects are copyable to any other etl::delegate object that handles the same function signature. Directly copying between std::function objects containing functions with different natures (global vs. member) isn't straightforward.

[pinwhell]

etl::delegate i tested, 😍, even if there is no connection with std::function, that's i cant ask for more, amazing!!!!!, in the future i as soon as i get free time i will consider start full time contributing to ETL, i love this library