Return std::optional<Event> from sf::WindowImpl::popEvent

src/SFML/Window/WindowBase.cpp

@@ -159,30 +159,34 @@ bool WindowBase::isOpen() const
 ////////////////////////////////////////////////////////////
 bool WindowBase::pollEvent(Event& event)
 {
-    if (m_impl && m_impl->popEvent(event, false))
+    if (!m_impl)
+        return false;
+
+    if (const auto maybeEvent = m_impl->popEvent(false))
     {
-        filterEvent(event);
+        filterEvent(*maybeEvent);
+        event = *maybeEvent;
         return true;
     }
-    else
-    {
+
     return false;
-    }
 }
 
 
 ////////////////////////////////////////////////////////////
 bool WindowBase::waitEvent(Event& event)
 {
-    if (m_impl && m_impl->popEvent(event, true))
+    if (!m_impl)
+        return false;
+
+    if (const auto maybeEvent = m_impl->popEvent(true))
     {
-        filterEvent(event);
+        filterEvent(*maybeEvent);
+        event = *maybeEvent;
         return true;
     }
-    else
-    {
+
     return false;
-    }
 }
 
 

src/SFML/Window/WindowImpl.cpp

@@ -171,7 +171,7 @@ void WindowImpl::setMaximumSize(const std::optional<Vector2u>& maximumSize)
 
 
 ////////////////////////////////////////////////////////////
-bool WindowImpl::popEvent(Event& event, bool block)
+std::optional<Event> WindowImpl::popEvent(bool block)
 {
     // If the event queue is empty, let's first check if new events are available from the OS
     if (m_events.empty())
@@ -200,13 +200,13 @@ bool WindowImpl::popEvent(Event& event, bool block)
     // Pop the first event of the queue, if it is not empty
     if (!m_events.empty())
     {
-        event = m_events.front();
+        const auto event = m_events.front();
         m_events.pop();
 
-        return true;
+        return event;
     }
 
-    return false;
+    return std::nullopt;
 }
 
 

src/SFML/Window/WindowImpl.hpp

@@ -125,7 +125,7 @@ public:
     /// \param block Use true to block the thread until an event arrives
     ///
     ////////////////////////////////////////////////////////////
-    bool popEvent(Event& event, bool block);
+    std::optional<Event> popEvent(bool block);
 
     ////////////////////////////////////////////////////////////
     /// \brief Get the OS-specific handle of the window