Systemcluster / Elsa

Modern C++ header-only interface to Lua 5.1+ and LuaJIT 2.0+ (WIP)

Elsa

C++17 header-only interface to Lua 5.1+ and LuaJIT 2.0+.

Work in progress. Not yet ready for general use!

See test/test.cpp for the current implemented functionality.

Usage

Install the files within include and include elsa.hpp. lua.hpp must exist in your include path and your project must link against a compatible lua library (Lua 5.1+, LuaJIT 2.0+, or similar).

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To build the tests, run cmake or manually compile test/test.cpp. In order to build the tests with cmake, execute the following command:

mkdir -p build && cd build && cmake .. && make

The tests can then be run by executing ./elsa_test.

Accessing Lua states

elsa::state state; // creates a new Lua state
elsa::state state { true }; // creates a new Lua state and opens the standard libraries

elsa::state is reference counting and supports thread-safe copying and moving.

To access an existing Lua state, pass its handle as the first argument. elsa::state will take ownership by default and close the state when all its instances get destroyed. Pass false as the second argument if you intend to manage the lifetime of the Lua state yourself.

lua_State* l = luaL_newstate();
elsa::state state { l, false }; // accesses an existing Lua state without taking ownership

Running Lua code

elsa::state state;
state("x = 5; b = false");
int x, bool b;
std::tie(x, b) = state.call<int, bool>("return x, b");