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-rw-r--r--include/astra/Singleton.h22
1 files changed, 18 insertions, 4 deletions
diff --git a/include/astra/Singleton.h b/include/astra/Singleton.h
index a256187..1ef4bba 100644
--- a/include/astra/Singleton.h
+++ b/include/astra/Singleton.h
@@ -57,15 +57,17 @@ class Singleton {
m_singleton = 0;
}
+ static void construct();
+
// get singleton
static T& getSingleton() {
if (!m_singleton)
- m_singleton = new T();
+ construct();
return *m_singleton;
}
static T* getSingletonPtr() {
if (!m_singleton)
- m_singleton = new T();
+ construct();
return m_singleton;
}
@@ -76,11 +78,23 @@ class Singleton {
};
-#define DEFINE_SINGLETON(T) template<> T* Singleton<T >::m_singleton = 0
+// We specifically avoid defining construct() in the header.
+// That way, the call to new is always executed by code inside libastra.
+// This avoids the situation where a singleton gets created by a copy
+// of the constructor linked into an object file outside of libastra, such
+// as a .mex file, which would then also cause the vtable to be outside of
+// libastra. This situation would cause issues when .mex files are unloaded.
+
+#define DEFINE_SINGLETON(T) \
+template<> void Singleton<T >::construct() { m_singleton = new T(); } \
+template<> T* Singleton<T >::m_singleton = 0
+
// This is a hack to support statements like
// DEFINE_SINGLETON2(CTemplatedClass<C1, C2>);
-#define DEFINE_SINGLETON2(A,B) template<> A,B* Singleton<A,B >::m_singleton = 0
+#define DEFINE_SINGLETON2(A,B) \
+template<> void Singleton<A,B >::construct() { m_singleton = new A,B(); } \
+template<> A,B* Singleton<A,B >::m_singleton = 0
} // end namespace