Add move semantics to 'Sound'

include/SFML/Audio/Sound.hpp

@@ -68,6 +68,14 @@ public:
     ////////////////////////////////////////////////////////////
     Sound(const Sound& copy);
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Move constructor
+    ///
+    /// \param other Instance to move
+    ///
+    ////////////////////////////////////////////////////////////
+    Sound(Sound&& other) noexcept;
+
     ////////////////////////////////////////////////////////////
     /// \brief Destructor
     ///
@@ -192,7 +200,7 @@ public:
     Status getStatus() const override;
 
     ////////////////////////////////////////////////////////////
-    /// \brief Overload of assignment operator
+    /// \brief Overload of copy assignment operator
     ///
     /// \param right Instance to assign
     ///
@@ -201,6 +209,16 @@ public:
     ////////////////////////////////////////////////////////////
     Sound& operator =(const Sound& right);
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Overload of move assignment operator
+    ///
+    /// \param right Instance to assign
+    ///
+    /// \return Reference to self
+    ///
+    ////////////////////////////////////////////////////////////
+    Sound& operator =(Sound&& right) noexcept;
+
     ////////////////////////////////////////////////////////////
     /// \brief Reset the internal buffer of the sound
     ///

src/SFML/Audio/Sound.cpp

@@ -28,6 +28,7 @@
 #include <SFML/Audio/Sound.hpp>
 #include <SFML/Audio/SoundBuffer.hpp>
 #include <SFML/Audio/ALCheck.hpp>
+#include <utility>
 
 #if defined(__APPLE__)
     #if defined(__clang__)
@@ -65,6 +66,14 @@ m_buffer   (nullptr)
 }
 
 
+////////////////////////////////////////////////////////////
+Sound::Sound(Sound&& other) noexcept :
+SoundSource(std::move(other)),
+m_buffer   (std::exchange(other.m_buffer, nullptr))
+{
+}
+
+
 ////////////////////////////////////////////////////////////
 Sound::~Sound()
 {
@@ -108,7 +117,7 @@ void Sound::setBuffer(const SoundBuffer& buffer)
     // Assign and use the new buffer
     m_buffer = &buffer;
     m_buffer->attachSound(this);
-    alCheck(alSourcei(m_source, AL_BUFFER, static_cast<ALint>(m_buffer->m_buffer)));
+    alCheck(alSourcei(m_source, AL_BUFFER, static_cast<ALint>(m_buffer->m_uniqueBufferId.get())));
 }
 
 
@@ -191,6 +200,18 @@ Sound& Sound::operator =(const Sound& right)
 }
 
 
+////////////////////////////////////////////////////////////
+Sound& Sound::operator =(Sound&& right) noexcept
+{
+    if (this == &right)
+        return *this;
+
+    SoundSource::operator=(std::move(right));
+    m_buffer = std::exchange(right.m_buffer, nullptr);
+
+    return *this;
+}
+
 ////////////////////////////////////////////////////////////
 void Sound::resetBuffer()
 {