Cannot use functors when exposing functions

[hkleynhans]

I have a requirement to pass functors when registering functions (and anything else which accepts a function pointer) using embind. At the moment embind accepts pointers to functions and non-capturing lambdas, but nothing which contains state.

Possibly related to: #1914

[hkleynhans]

The following adds the ability to use function objects and std::function objects in class_<T>.function: #8920

After this I will also submit patches to extending the same behavior to class_<T>.property, class_<T>.constructor and .function.

[hkleynhans]

The following PR adds the ability to pass function objects and std::function to class_<T>.constructor: #9051

[hkleynhans]

The following PR adds the ability to use function objects and std::function with class_<T>.property: #9172

[stale]

This issue has been automatically marked as stale because there has been no activity in the past year. It will be closed automatically if no further activity occurs in the next 7 days. Feel free to re-open at any time if this issue is still relevant.