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#define SOL_ALL_SAFETIES_ON 1
#define SOL_ENABLE_INTEROP \
1 // MUST be defined to use interop features
#include <sol/sol.hpp>
#include <LuaBridge/LuaBridge.h>
#include <iostream>
// LuaBridge,
// no longer maintained, by VinnieFalco:
// https://github.com/vinniefalco/LuaBridge
struct A {
A(int v) : v_(v) {
}
void print() {
std::cout << "called A::print" << std::endl;
}
int value() const {
return v_;
}
private:
int v_ = 50;
};
template <typename T, typename Handler>
inline bool sol_lua_interop_check(sol::types<T>, lua_State* L,
int relindex, sol::type index_type, Handler&& handler,
sol::stack::record& tracking) {
// just marking unused parameters for no compiler warnings
(void)index_type;
(void)handler;
tracking.use(1);
int index = lua_absindex(L, relindex);
T* corrected = luabridge::Userdata::get<T>(L, index, true);
return corrected != nullptr;
}
template <typename T>
inline std::pair<bool, T*> sol_lua_interop_get(sol::types<T> t,
lua_State* L, int relindex, void* unadjusted_pointer,
sol::stack::record& tracking) {
(void)unadjusted_pointer;
int index = lua_absindex(L, relindex);
if (!sol_lua_interop_check(t,
L,
index,
sol::type::userdata,
sol::no_panic,
tracking)) {
return { false, nullptr };
}
T* corrected = luabridge::Userdata::get<T>(L, index, true);
return { true, corrected };
}
void register_sol_stuff(lua_State* L) {
// grab raw state and put into state_view
// state_view is cheap to construct
sol::state_view lua(L);
// bind and set up your things: everything is entirely
// self-contained
lua["f"] = sol::overload(
[](A& from_luabridge) {
std::cout << "calling 1-argument version with "
"luabridge-created A { "
<< from_luabridge.value() << " }"
<< std::endl;
SOL_ASSERT(from_luabridge.value() == 24);
},
[](A& from_luabridge, int second_arg) {
std::cout << "calling 2-argument version with "
"luabridge-created A { "
<< from_luabridge.value()
<< " } and integer argument of "
<< second_arg << std::endl;
SOL_ASSERT(from_luabridge.value() == 24);
SOL_ASSERT(second_arg == 5);
});
}
void check_with_sol(lua_State* L) {
sol::state_view lua(L);
A& obj = lua["obj"];
(void)obj;
SOL_ASSERT(obj.value() == 24);
}
int main(int, char*[]) {
std::cout << "=== interop example (LuaBridge) ==="
<< std::endl;
std::cout << "code modified from LuaBridge's examples: "
"https://github.com/vinniefalco/LuaBridge"
<< std::endl;
struct closer {
void operator()(lua_State* L) {
lua_close(L);
}
};
std::unique_ptr<lua_State, closer> state(luaL_newstate());
lua_State* L = state.get();
luaL_openlibs(L);
luabridge::getGlobalNamespace(L)
.beginNamespace("test")
.beginClass<A>("A")
.addConstructor<void (*)(int)>()
.addFunction("print", &A::print)
.addFunction("value", &A::value)
.endClass()
.endNamespace();
register_sol_stuff(L);
if (luaL_dostring(L, R"(
obj = test.A(24)
f(obj) -- call 1 argument version
f(obj, 5) -- call 2 argument version
)")) {
lua_error(L);
}
check_with_sol(L);
return 0;
}
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