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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 <iostream>
// kaguya code lifted from README.md,
// written by satoren:
// https://github.com/satoren/kaguya
// Copyright satoren
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
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);
// use kaguya's own detail wrapper check to see if it's
// correct
bool is_correct_type
= kaguya::detail::object_wrapper_type_check(L, index);
return is_correct_type;
}
template <typename T>
inline std::pair<bool, T*> sol_lua_interop_get(sol::types<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
// kaguya's storage of data is incompatible with sol's
// it stores the data directly in the pointer, not a pointer
// inside of the `void*` therefore, leave the raw userdata
// pointer as-is, if it's of the right type
int index = lua_absindex(L, relindex);
if (!kaguya::detail::object_wrapper_type_check(L, index)) {
return { false, nullptr };
}
// using 1 element
tracking.use(1);
kaguya::ObjectWrapperBase* base
= kaguya::object_wrapper(L, index);
return { true, static_cast<T*>(base->get()) };
}
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_kaguya) {
std::cout << "calling 1-argument version with "
"kaguya-created ABC { "
<< from_kaguya.value() << " }"
<< std::endl;
SOL_ASSERT(from_kaguya.value() == 24);
},
[](ABC& from_kaguya, int second_arg) {
std::cout << "calling 2-argument version with "
"kaguya-created ABC { "
<< from_kaguya.value()
<< " } and integer argument of "
<< second_arg << std::endl;
SOL_ASSERT(from_kaguya.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 (kaguya) ==="
<< std::endl;
std::cout << "(code lifted from kaguya's README examples: "
"https://github.com/satoren/kaguya)"
<< std::endl;
kaguya::State state;
state["ABC"].setClass(
kaguya::UserdataMetatable<ABC>()
.setConstructors<ABC(), ABC(int)>()
.addFunction("get_value", &ABC::value)
.addFunction("set_value", &ABC::setValue)
.addOverloadedFunctions(
"overload", &ABC::overload1, &ABC::overload2)
.addStaticFunction("nonmemberfun",
[](ABC* self, int) { return 1; }));
register_sol_stuff(state.state());
state.dostring(R"(
obj = ABC.new(24)
f(obj) -- call 1 argument version
f(obj, 5) -- call 2 argument version
)");
check_with_sol(state.state());
return 0;
}
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