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g++ main.cpp -I ../src/ -I ../../../lua/lua-5.4.4/src/ -L../src/ -L../../../lua/lua-5.4.4/src/ -llua -lluaincpp -fpermissive
main.cpp: In function 'int main()':
main.cpp:14:32: error: no matching function for call to 'add(const char [4], int (*)(int, int), const char [7])'
     l.add("add", &add, "mymath");
                                ^
In file included from ../src/LuaInCpp.hpp:3:0,
                 from main.cpp:1:
../src/Lua.hpp:27:10: note: candidate: void Lua::add(const string&, lua_CFunction, const string&) <near match>
     void add(const std::string &, lua_CFunction, const std::string & = "");
          ^~~
../src/Lua.hpp:27:10: note:   conversion of argument 2 would be ill-formed:
main.cpp:14:18: warning: invalid conversion from 'int (*)(int, int)' to 'lua_CFunction {aka int (*)(lua_State*)}' [-fpermissive]
     l.add("add", &add, "mymath");
                  ^~~~
In file included from ../src/LuaInCpp.hpp:3:0,
                 from main.cpp:1:
../src/Lua.hpp:29:10: note: candidate: void Lua::add(const string&, lua_Integer, const string&) <near match>
     void add(const std::string &, lua_Integer, const std::string & = "");
          ^~~
../src/Lua.hpp:29:10: note:   conversion of argument 2 would be ill-formed:
main.cpp:14:18: warning: invalid conversion from 'int (*)(int, int)' to 'lua_Integer {aka long long int}' [-fpermissive]
     l.add("add", &add, "mymath");
                  ^~~~
In file included from ../src/LuaInCpp.hpp:3:0,
                 from main.cpp:1:
../src/Lua.hpp:31:10: note: candidate: void Lua::add(const string&, void*, const string&) <near match>
     void add(const std::string &, void *, const std::string & = "");
          ^~~
../src/Lua.hpp:31:10: note:   conversion of argument 2 would be ill-formed:
main.cpp:14:18: warning: invalid conversion from 'int (*)(int, int)' to 'void*' [-fpermissive]
     l.add("add", &add, "mymath");