diff options
| author | Andy <drumsetmonkey@gmail.com> | 2019-08-29 13:07:45 -0400 |
|---|---|---|
| committer | Andy <drumsetmonkey@gmail.com> | 2019-08-29 13:07:45 -0400 |
| commit | 4ac4b280abf2ffa28caa5a532353115a3033444f (patch) | |
| tree | 2a13d658bb454360b2faf401244bb0321d3460d4 /lib/sol2/examples/source/shared_ptr_modify_in_place.cpp | |
| parent | e9758416b18b27a65337c28d9641afc0ee89b34b (diff) | |
| parent | 7a46fa2dd3dad3f038bf8e7339bc67abca428ae6 (diff) | |
Started creating scripting library/namespace and added sol2 for interfacing
Diffstat (limited to 'lib/sol2/examples/source/shared_ptr_modify_in_place.cpp')
| -rw-r--r-- | lib/sol2/examples/source/shared_ptr_modify_in_place.cpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/sol2/examples/source/shared_ptr_modify_in_place.cpp b/lib/sol2/examples/source/shared_ptr_modify_in_place.cpp new file mode 100644 index 0000000..b116705 --- /dev/null +++ b/lib/sol2/examples/source/shared_ptr_modify_in_place.cpp @@ -0,0 +1,52 @@ +#define SOL_ALL_SAFETIES_ON 1
+#include <sol/sol.hpp>
+
+#include <iostream>
+
+struct ree {
+ int value = 1;
+ ree() {}
+ ree(int v) : value(v) {}
+};
+
+int main() {
+
+ std::cout << "=== special pointers -- modify in place ===" << std::endl;
+
+ sol::state lua;
+
+ auto new_shared_ptr = [](sol::stack_reference obj) {
+ // works just fine
+ sol::stack::modify_unique_usertype(obj, [](std::shared_ptr<ree>& sptr) {
+ sptr = std::make_shared<ree>(sptr->value + 1);
+ });
+ };
+
+ auto reset_shared_ptr = [](sol::stack_reference obj) {
+ sol::stack::modify_unique_usertype(obj, [](std::shared_ptr<ree>& sptr) {
+ // THIS IS SUCH A BAD IDEA AAAGH
+ sptr.reset();
+ // DO NOT reset to nullptr:
+ // change it to an actual NEW value...
+ // otherwise you will inject a nullptr into the userdata representation...
+ // which will NOT compare == to Lua's nil
+ });
+ };
+
+ lua.set_function("f", new_shared_ptr);
+ lua.set_function("f2", reset_shared_ptr);
+ lua.set_function("g", [](ree* r) {
+ std::cout << r->value << std::endl;
+ });
+
+ lua["p"] = std::make_shared<ree>();
+ lua.script("g(p) -- okay");
+ lua.script("f(p)");
+ lua.script("g(p) -- okay");
+ // uncomment the below for
+ // segfault/read-access violation
+ lua.script("f2(p)");
+ //lua.script("g(p) -- kaboom");
+
+ return 0;
+}
|