diff options
| author | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:19:31 -0400 |
|---|---|---|
| committer | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:19:31 -0400 |
| commit | bd3fe0cac583739bc0d7c4b5c8f301bb350abca0 (patch) | |
| tree | 7eeb1aabcebd6999de1c3457d0882246ec0ff4d4 /deps/sol2/examples/source/shared_ptr_modify_in_place.cpp | |
| parent | 2662ac356ce14dacfbc91689fd37244facff4989 (diff) | |
Renamed lib to deps so github will ignore it for language stats
Diffstat (limited to 'deps/sol2/examples/source/shared_ptr_modify_in_place.cpp')
| -rw-r--r-- | deps/sol2/examples/source/shared_ptr_modify_in_place.cpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/deps/sol2/examples/source/shared_ptr_modify_in_place.cpp b/deps/sol2/examples/source/shared_ptr_modify_in_place.cpp new file mode 100644 index 0000000..b116705 --- /dev/null +++ b/deps/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;
+}
|