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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 <luwra.hpp>
#include <iostream>
// luwra,
// another C++ wrapper library:
// https://github.com/vapourismo/luwra
struct ABC {
ABC() : v_(0) {
}
ABC(int value) : v_(value) {
}
int value() const {
return v_;
}
void setValue(int v) {
v_ = v;
}
void overload1() {
std::cout << "call overload1" << std::endl;
}
void overload2(int) {
std::cout << "call overload2" << std::endl;
}
private:
int v_;
};
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;
// using 1 element
tracking.use(1);
int index = lua_absindex(L, relindex);
if (lua_getmetatable(L, index) == 1) {
luaL_getmetatable(
L, luwra::internal::UserTypeReg<T>::name.c_str());
bool is_correct_type = lua_rawequal(L, -2, -1) == 1;
lua_pop(L, 2);
return is_correct_type;
}
return false;
}
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) {
// you may not need to specialize this method every time:
// some libraries are compatible with sol2's layout
int index = lua_absindex(L, relindex);
if (!sol_lua_interop_check(t,
L,
index,
sol::type::userdata,
sol::no_panic,
tracking)) {
return { false, nullptr };
}
return { true, static_cast<T*>(unadjusted_pointer) };
}
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(
[](ABC& from_luwra) {
std::cout << "calling 1-argument version with "
"luwra-created ABC { "
<< from_luwra.value() << " }"
<< std::endl;
SOL_ASSERT(from_luwra.value() == 24);
},
[](ABC& from_luwra, int second_arg) {
std::cout << "calling 2-argument version with "
"luwra-created ABC { "
<< from_luwra.value()
<< " } and integer argument of "
<< second_arg << std::endl;
SOL_ASSERT(from_luwra.value() == 24);
SOL_ASSERT(second_arg == 5);
});
}
void check_with_sol(lua_State* L) {
sol::state_view lua(L);
ABC& obj = lua["obj"];
(void)obj;
SOL_ASSERT(obj.value() == 24);
}
int main(int, char*[]) {
std::cout << "=== interop example (luwra) ===" << std::endl;
std::cout << "code modified from luwra's documentation "
"examples: https://github.com/vapourismo/luwra"
<< std::endl;
luwra::StateWrapper state;
state.registerUserType<ABC(int)>("ABC",
{ LUWRA_MEMBER(ABC, value),
LUWRA_MEMBER(ABC, setValue) },
{});
register_sol_stuff(state);
state.runString(R"(
obj = ABC(24)
f(obj) -- call 1 argument version
f(obj, 5) -- call 2 argument version
)");
check_with_sol(state);
return 0;
}
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