62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
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#define SOL_ALL_SAFETIES_ON 1
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#include <sol/sol.hpp>
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#include <memory>
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#include <iostream>
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struct Shape {
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virtual ~Shape() = default;
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};
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struct Box : Shape { };
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SOL_BASE_CLASSES(Box, Shape);
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SOL_DERIVED_CLASSES(Shape, Box);
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int main() {
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sol::state lua;
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lua.open_libraries(sol::lib::base);
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lua.new_usertype<Shape>("Shape", sol::no_constructor);
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lua.new_usertype<Box>("Box", sol::factories([&]() {
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auto b = std::make_shared<Box>();
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std::cout << "create Box@" << std::hex << b.get()
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<< '\n';
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return b;
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}));
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lua.set_function(
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"inspect_shape_table", [](const sol::table& args) {
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std::shared_ptr<Shape> defbox = nullptr;
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// check if there's a field with the name "shape"
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auto s = args.get<
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sol::optional<std::shared_ptr<Shape>>>(
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"shape");
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std::cout << "has : " << std::boolalpha
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<< s.has_value() << '\n';
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// get the field named "shape" or use the default
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// value
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std::cout << "get_or: " << std::hex
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<< args.get_or<std::shared_ptr<Shape>>(
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"shape", defbox)
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.get()
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<< '\n';
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// this works but I can't test for existence
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// beforehand...
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std::cout
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<< "get : " << std::hex
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<< args.get<std::shared_ptr<Shape>>("shape")
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.get()
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<< '\n';
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});
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sol::protected_function_result result = lua.safe_script(
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"inspect_shape_table({shape=Box.new()})");
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SOL_ASSERT(result.valid());
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return 0;
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}
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