From 184d2f08027933d4eeff97d662528a5223cea18b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Thu, 28 Feb 2019 14:50:19 +0100
Subject: [PATCH] [shared] ExpiringPointer: add constructor to enable pointer
 casting

---
 apps/shared/expiring_pointer.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/apps/shared/expiring_pointer.h b/apps/shared/expiring_pointer.h
index 85642ef02..699e47939 100644
--- a/apps/shared/expiring_pointer.h
+++ b/apps/shared/expiring_pointer.h
@@ -7,12 +7,21 @@ namespace Shared {
 
 template <class T>
 class ExpiringPointer {
+  template<typename U>
+  friend class ExpiringPointer;
 public:
   ExpiringPointer(T * rawPointer, bool reinitGlobal = true) : m_rawPointer(rawPointer) {
 #if DEBUG
     s_global = rawPointer;
 #endif
   }
+  template<class U>
+  ExpiringPointer(ExpiringPointer<U> p) : m_rawPointer(static_cast<T *>(p.m_rawPointer)) {
+#if DEBUG
+    s_global = m_rawPointer;
+#endif
+  }
+  bool isNull() { return m_rawPointer == nullptr; }
   T *operator->() {
 #if DEBUG
     assert(m_rawPointer != nullptr && m_rawPointer == s_global);