sml::aux::get_type_name<TAction>() not returning name of lambda function

[infn-ke]

When invoking the function sml::aux::get_type_name<TAction>() it does not return the name of the lambda function for the action. Instead it returns a string formatted something like action::<lambda(my_type)>. Is there really no way to get the actual name of the lambda function in state machine logger?

[Alex0vSky]

I wrote this in a hurry at first:

Perhaps the simplest thing we can do is to use std::source_location::function_name in C++20.
Look at SO answer and cppreference
But SML for C++14.

But everything is simpler. To have a name, you need to use not a lambda, but a real function.
I also encountered this in the Plant UML Integration example.
Instead this

void on_s1_entry() {}
...
      , "s1"_s + sml::on_entry<_> / [] { on_s1_entry(); }

use the code next to it

void on_s1_entry_f() {}
...
struct on_s1_entry {
  auto operator()() { on_s1_entry_f(); }
} on_s1_entry;
...
      , "s1"_s + sml::on_entry<_> / on_s1_entry

to get the actual name of on_s1_entry.

The names in the example are very similar and it is easy to get confused.

[infn-ke]

I figured out the same and switched from lambdas to functors.