75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
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#define SOL_ALL_SAFETIES_ON 1
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#include <sol/sol.hpp>
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// Something that can't be collided with
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static const auto& script_key
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= "GlobalResource.MySpecialIdentifier123";
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struct GlobalResource {
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int value = 2;
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};
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template <typename Handler>
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bool sol_lua_check(sol::types<GlobalResource*>, lua_State* L,
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int /*index*/, Handler&& handler,
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sol::stack::record& tracking) {
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// not actually taking anything off the stack
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tracking.use(0);
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// get the field from global storage
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sol::stack::get_field<true>(L, script_key);
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// verify type
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sol::type t = static_cast<sol::type>(lua_type(L, -1));
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lua_pop(L, 1);
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if (t != sol::type::lightuserdata) {
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handler(L,
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0,
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sol::type::lightuserdata,
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t,
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"global resource is not present as a light "
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"userdata");
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return false;
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}
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return true;
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}
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GlobalResource* sol_lua_get(sol::types<GlobalResource*>,
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lua_State* L, int /*index*/, sol::stack::record& tracking) {
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// retrieve the (light) userdata for this type
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// not actually pulling anything off the stack
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tracking.use(0);
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sol::stack::get_field<true>(L, script_key);
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GlobalResource* ls
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= static_cast<GlobalResource*>(lua_touserdata(L, -1));
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// clean up stack value returned by `get_field`
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lua_pop(L, 1);
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return ls;
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}
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int sol_lua_push(sol::types<GlobalResource*>, lua_State* L,
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GlobalResource* ls) {
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// push light userdata
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return sol::stack::push(L, static_cast<void*>(ls));
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}
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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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GlobalResource instance;
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// get GlobalResource
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lua.set_function("f", [](GlobalResource* l, int value) {
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return l->value + value;
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});
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lua.set(script_key, &instance);
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// note only 1 argument,
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// despite f having 2 arguments to recieve
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lua.script("assert(f(1) == 3)");
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return 0;
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}
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