59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
#define SOL_ALL_SAFETIES_ON 1
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#include <sol/sol.hpp>
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#include <iostream>
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struct ree {
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int value = 1;
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ree() {
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}
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ree(int v) : value(v) {
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}
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};
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int main() {
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std::cout << "=== special pointers -- modify in place ==="
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<< std::endl;
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sol::state lua;
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auto new_shared_ptr = [](sol::stack_reference obj) {
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// works just fine
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sol::stack::modify_unique_usertype(
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obj, [](std::shared_ptr<ree>& sptr) {
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sptr = std::make_shared<ree>(
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sptr->value + 1);
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});
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};
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auto reset_shared_ptr = [](sol::stack_reference obj) {
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sol::stack::modify_unique_usertype(
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obj, [](std::shared_ptr<ree>& sptr) {
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// THIS IS SUCH A BAD IDEA AAAGH
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sptr.reset();
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// DO NOT reset to nullptr:
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// change it to an actual NEW value...
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// otherwise you will inject a nullptr into
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// the userdata representation... which will
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// NOT compare == to Lua's nil
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});
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};
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lua.set_function("f", new_shared_ptr);
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lua.set_function("f2", reset_shared_ptr);
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lua.set_function("g",
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[](ree* r) { std::cout << r->value << std::endl; });
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lua["p"] = std::make_shared<ree>();
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lua.script("g(p) -- okay");
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lua.script("f(p)");
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lua.script("g(p) -- okay");
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// uncomment the below for
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// segfault/read-access violation
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lua.script("f2(p)");
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// lua.script("g(p) -- kaboom");
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return 0;
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}
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