internal: new shared_ptr and weak_ptr implementation (#5883)

moves std::shared_ptrs to a new implementation

Advantages:
- you can dereference a weak_ptr directly. This will obviously segfault on a nullptr deref if it's expired.
   - this is useful to avoid the .lock() hell where we are 100% sure the pointer _should_ be valid. (and if it isn't, it should throw.)
- weak_ptrs are still valid while the SP is being destroyed.
   - reasoning: while an object (e.g. CWindow) is being destroyed, its `weak_ptr self` should be accessible (the sp is still alive, and so is CWindow), but it's not because by stl it's already expired (to prevent resurrection)
   - this impl solves it differently. w_p is expired, but can still be dereferenced and used. Creating `s_p`s is not possible anymore, though.
   - this is useful in destructors and callbacks.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/devices/VirtualKeyboard.cpp b/src/devices/VirtualKeyboard.cpp
index dfe3c6df..e2be0078 100644
--- a/src/devices/VirtualKeyboard.cpp
+++ b/src/devices/VirtualKeyboard.cpp
@@ -57,7 +57,7 @@ bool CVirtualKeyboard::isVirtual() {
 wlr_keyboard* CVirtualKeyboard::wlr() {
     if (keyboard.expired())
         return nullptr;
-    return keyboard.lock()->wlr();
+    return keyboard->wlr();
 }
 
 void CVirtualKeyboard::disconnectCallbacks() {
@@ -71,5 +71,5 @@ void CVirtualKeyboard::disconnectCallbacks() {
 wl_client* CVirtualKeyboard::getClient() {
     if (keyboard.expired())
         return nullptr;
-    return keyboard.lock()->client();
+    return keyboard->client();
 }