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https://github.com/ThePhD/sol2.git
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120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
#define SOL_ALL_SAFETIES_ON 1
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#define SOL_ENABLE_INTEROP 1 // MUST be defined to use interop features
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#include <sol/sol.hpp>
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#include <iostream>
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// kaguya code lifted from README.md,
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// written by satoren:
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// https://github.com/satoren/kaguya
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// Copyright satoren
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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struct ABC {
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ABC() : v_(0) {
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}
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ABC(int value) : v_(value) {
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}
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int value() const {
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return v_;
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}
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void setValue(int v) {
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v_ = v;
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}
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void overload1() {
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std::cout << "call overload1" << std::endl;
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}
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void overload2(int) {
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std::cout << "call overload2" << std::endl;
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}
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private:
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int v_;
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};
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template <typename T, typename Handler>
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inline bool sol_lua_interop_check(sol::types<T>, lua_State* L, int relindex, sol::type index_type, Handler&& handler, sol::stack::record& tracking) {
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// just marking unused parameters for no compiler warnings
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(void)index_type;
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(void)handler;
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// using 1 element
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tracking.use(1);
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int index = lua_absindex(L, relindex);
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// use kaguya's own detail wrapper check to see if it's correct
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bool is_correct_type = kaguya::detail::object_wrapper_type_check(L, index);
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return is_correct_type;
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}
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template <typename T>
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inline std::pair<bool, T*> sol_lua_interop_get(sol::types<T>, lua_State* L, int relindex, void* unadjusted_pointer, sol::stack::record& tracking) {
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// you may not need to specialize this method every time:
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// some libraries are compatible with sol2's layout
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// kaguya's storage of data is incompatible with sol's
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// it stores the data directly in the pointer, not a pointer inside of the `void*`
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// therefore, leave the raw userdata pointer as-is,
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// if it's of the right type
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int index = lua_absindex(L, relindex);
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if (!kaguya::detail::object_wrapper_type_check(L, index)) {
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return { false, nullptr };
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}
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// using 1 element
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tracking.use(1);
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kaguya::ObjectWrapperBase* base = kaguya::object_wrapper(L, index);
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return { true, static_cast<T*>(base->get()) };
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}
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void register_sol_stuff(lua_State* L) {
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// grab raw state and put into state_view
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// state_view is cheap to construct
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sol::state_view lua(L);
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// bind and set up your things: everything is entirely self-contained
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lua["f"] = sol::overload(
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[](ABC& from_kaguya) {
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std::cout << "calling 1-argument version with kaguya-created ABC { " << from_kaguya.value() << " }" << std::endl;
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sol_c_assert(from_kaguya.value() == 24);
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},
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[](ABC& from_kaguya, int second_arg) {
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std::cout << "calling 2-argument version with kaguya-created ABC { " << from_kaguya.value() << " } and integer argument of " << second_arg
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<< std::endl;
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sol_c_assert(from_kaguya.value() == 24);
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sol_c_assert(second_arg == 5);
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});
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}
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void check_with_sol(lua_State* L) {
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sol::state_view lua(L);
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ABC& obj = lua["obj"];
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(void)obj;
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sol_c_assert(obj.value() == 24);
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}
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int main(int, char*[]) {
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std::cout << "=== interop example (kaguya) ===" << std::endl;
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std::cout << "(code lifted from kaguya's README examples: https://github.com/satoren/kaguya)" << std::endl;
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kaguya::State state;
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state["ABC"].setClass(kaguya::UserdataMetatable<ABC>()
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.setConstructors<ABC(), ABC(int)>()
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.addFunction("get_value", &ABC::value)
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.addFunction("set_value", &ABC::setValue)
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.addOverloadedFunctions("overload", &ABC::overload1, &ABC::overload2)
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.addStaticFunction("nonmemberfun", [](ABC* self, int) { return 1; }));
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register_sol_stuff(state.state());
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state.dostring(R"(
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obj = ABC.new(24)
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f(obj) -- call 1 argument version
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f(obj, 5) -- call 2 argument version
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)");
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check_with_sol(state.state());
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return 0;
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} |