40 lines
2.8 KiB
ReStructuredText
40 lines
2.8 KiB
ReStructuredText
integrating into existing code
|
|
==============================
|
|
|
|
If you're already using lua and you just want to use ``sol`` in some places, you can use ``state_view``:
|
|
|
|
.. code-block:: cpp
|
|
:linenos:
|
|
:caption: using state_view
|
|
:name: state-view-snippet
|
|
|
|
int something_in_my_system (lua_State* L) {
|
|
// start using sol with a pre-existing system
|
|
sol::state_view lua(L); // non-owning
|
|
|
|
lua.script("print('bark bark bark!')");
|
|
|
|
// get the table off the top of the stack
|
|
sol::table expected_table(L, -1);
|
|
// start using it...
|
|
|
|
return 0; // or whatever you require of working with a raw function
|
|
}
|
|
|
|
:doc:`sol::state_view<../api/state>` is exactly like ``sol::state``, but it doesn't manage the lifetime of a ``lua_State*``. Therefore, you get all the goodies that come with a ``sol::state`` without any of the ownership implications. sol has no initialization components that need to deliberately remain alive for the duration of the program. It's entirely self-containing and uses lua's garbage collectors and various implementation techniques to require no state C++-side. After you do that, all of the power of `sol` is available to you, and then some!
|
|
|
|
``sol::state_view`` is also helpful when you want to `create a DLL that loads some Lua module`_ via requires.
|
|
|
|
You may also want to call ``require`` and supply a string of a script file or something that returns an object that you set equal to something in C++. For that, you can use the :ref:`require functionality<state-require-function>`.
|
|
|
|
Remember that sol can be as lightweight as you want it: almost all of sol's Lua types take the ``lua_State*`` argument and then a second ``int index`` stack index argument, meaning you can use :doc:`tables<../api/table>`, :doc:`lua functions<../api/function>`, :doc:`coroutines<../api/coroutine>`, and other reference-derived objects that expose the proper constructor for your use. You can also set :doc:`usertypes<../api/usertype>` and other things you need without changing your entire architecture in one go.
|
|
|
|
You can even customize it to `work with an external Lua wrapper/framework/library`_.
|
|
|
|
Note that you can also make non-standard pointer and reference types with custom reference counting and such also play nice with the system. See :doc:`unique_usertype_traits\<T><../api/unique_usertype_traits>` to see how! Custom types is also mentioned in the :doc:`customization tutorial<customization>`.
|
|
|
|
There are a few things that creating a ``sol::state`` does for you. You can read about it :ref:`in the sol::state docs<state-automatic-handlers>` and call those functions directly if you need them.
|
|
|
|
.. _create a DLL that loads some Lua module: https://github.com/ThePhD/sol2/tree/develop/examples/require_dll_example
|
|
.. _work with an external Lua wrapper/framework/library: https://github.com/ThePhD/sol2/tree/develop/examples/interop
|