LuaCMake

MWE embed of Lua into a CMake project with a tiny demo

Run the build.sh script to observe the outputs on each branch

Ex 1, main

Simply call some Lua code

$ ./build/test 
5	3
55

Lua code

function fib(n)
   if n == 1 or n == 2 then
      return 1,1
   end
   prev, prevPrev = fib(n-1)
   return prev+prevPrev, prev
end

print(fib(5))
print((fib(10)))

Ex 2, addFunctions

Register a custom "C" library, call it from Lua

$ ./build/test 
2.5

Lua code (userLib is a custom "C" library)

a = userLib.avg(1,2,3,4)
print(a)

Ex 3, addMemberFunction

Register a custom "C" library, encapsulating a C++ class's member functions, call them from Lua

refer to https://stackoverflow.com/questions/32416388/how-to-register-member-function-to-lua-without-lua-bind-in-c

$ ./build/test 
6.0
0.0

Lua code (userLib encapsulate a C++ class's member functions)

userLib.pushValues(1,2,3)
a = userLib.sumValues()
print(a)
userLib.clearValues()
b = userLib.sumValues()
print(b)

Ex 4, multiClasses

Register a custom "C" library, encapsulating two C++ classes' member functions, call them from Lua

Extends the previous example by wrapping the class pointers into a struct. Then setting Lua's extra space as that struct

$ ./build/test 
6.0
0.0
Class Foo here!

Lua code (userLib encapsulate a C++ class's member functions)

userLib.pushValues(1,2,3)
a = userLib.sumValues()
print(a)
userLib.clearValues()
b = userLib.sumValues()
print(b)

userLib.fooSay()

Building (CMake)

Lua is built using the CMake incantations

file(GLOB LUA_SRC "vendored/lua-5.4.4/src/*.c")
include_directories(src include)
add_library(Lua STATIC ${LUA_SRC})

and linked to an exectuable as

target_link_libraries(test Lua)

The only change from base Lua 5.4.4 is the removal of lua.c from vendored/lua-5.4.4/src/ this allows your code to define an entry point.

This is a decent guide to Lua 5/C++ intro guide