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ReStructuredText
84 lines
5.0 KiB
ReStructuredText
getting started
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===============
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Let's get you going with sol! To start, you'll need to use a lua distribution of some sort. sol doesn't provide that: it only wraps the API that comes with it, so you can pick whatever distribution you like for your application. There are lots, but the two popular ones are `vanilla Lua`_ and speedy `LuaJIT`_ . We recommend vanilla Lua if you're getting started, LuaJIT if you need speed and can handle some caveats: the interface for sol doesn't change no matter what Lua version you're using.
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If you need help getting or building Lua, check out the `Lua page on getting started`_. Note that for Visual Studio, one can simply download the sources, include all the Lua library files in that project, and then build for debug/release, x86/x64/ARM rather easily and with minimal interference. Just make sure to adjust the Project Property page to build as a static library (or a DLL with the proper define set in the ``Preprocessor`` step).
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After that, make sure you grab either the `single header file release`_, or just perform a clone of the `github repository here`_ and set your include paths up so that you can get at ``sol.hpp`` somehow. Note that we also have the latest version of the single header file with all dependencies included kept in the `repository as well`_. We recommend the single-header-file release, since it's easier to move around, manage and update if you commit it with some form of version control. You can also clone/submodule the repository and then point at the `single/sol/sol.hpp`_ on your include files path. Clone with:
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>>> git clone https://github.com/ThePhD/sol2.git
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When you're ready, try compiling this short snippet:
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.. code-block:: cpp
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:linenos:
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:caption: test.cpp: the first snippet
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:name: the-first-snippet
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#include <sol/sol.hpp> // or #include "sol.hpp", whichever suits your needs
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int main (int argc, char* argv[]) {
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sol::state lua;
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lua.open_libraries( sol::lib::base );
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lua.script( "print('bark bark bark!')" );
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return 0;
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}
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Using this simple command line:
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>>> g++ -std=c++14 test.cpp -I"path/to/lua/include" -L"path/to/lua/lib" -llua
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Or using your favorite IDE / tool after setting up your include paths and library paths to Lua according to the documentation of the Lua distribution you got. Remember your linked lua library (``-llua``) and include / library paths will depend on your OS, file system, Lua distribution and your installation / compilation method of your Lua distribution.
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.. note::
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If you get an avalanche of errors (particularly referring to ``auto``), you may not have enabled C++14 / C++17 mode for your compiler. Add one of ``std=c++14``, ``std=c++1z`` OR ``std=c++1y`` to your compiler options. By default, this is always-on for VC++ compilers in Visual Studio and friends, but g++ and clang++ require a flag (unless you're on `GCC 6.0`_ or better).
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If this works, you're ready to start! The first line creates the ``lua_State`` and will hold onto it for the duration of the scope its declared in (e.g., from the opening ``{`` to the closing ``}``). It will automatically close / cleanup that lua state when it gets destructed.
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The second line opens a single lua-provided library, "base". There are several other libraries that come with lua that you can open by default, and those are included in the :ref:`sol::lib<lib-enum>` enumeration. You can open multiple base libraries by specifying multiple ``sol::lib`` arguments:
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.. code-block:: cpp
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:linenos:
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:caption: test.cpp: the first snippet
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:name: the-second-snippet
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#include <sol/sol.hpp>
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int main (int argc, char* argv[]) {
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sol::state lua;
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lua.open_libraries( sol::lib::base, sol::lib::coroutine, sol::lib::string, sol::lib::io );
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lua.script( "print('bark bark bark!')" );
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return 0;
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}
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If you're interested in integrating sol with a project that already uses some other library or Lua in the codebase, check out the :doc:`existing example<existing>` to see how to work with sol when you add it to a project (the existing example covers ``require`` as well)!
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.. note::
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After you learn the basics of sol, it is usually advised that if you think something can work, you should TRY IT. It will probably work!
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Some more ways of loading scripts and handling errors is shown `in this example`_! There is also a full, cross-platform `example of loading a DLL`_.
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Next, let's start :doc:`reading/writing some variables<variables>` from Lua into C++, and vice-versa!
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.. _vanilla Lua: https://www.lua.org/
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.. _LuaJIT: http://luajit.org/
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.. _GCC 6.0: https://gcc.gnu.org/gcc-6/changes.html
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.. _single header file release: https://github.com/ThePhD/sol2/releases
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.. _repository as well: https://github.com/ThePhD/sol2/blob/develop/single/sol/sol.hpp
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.. _single/sol/sol.hpp: https://github.com/ThePhD/sol2/blob/develop/single/sol/sol.hpp
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.. _github repository here: https://github.com/ThePhD/sol2
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.. _Lua page on getting started: https://www.lua.org/start.html
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.. _in this example: https://github.com/ThePhD/sol2/blob/develop/examples/source/basic.cpp
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.. _example of loading a DLL: https://github.com/ThePhD/sol2/tree/develop/examples/require_dll_example
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