From f9b68bafd90941d9faf53e5e2771361e3ab4336a Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>
Date: Tue, 17 May 2016 16:00:28 +0200
Subject: Add sanity check

---
 include/astra/Singleton.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/astra/Singleton.h b/include/astra/Singleton.h
index 1ef4bba..784c521 100644
--- a/include/astra/Singleton.h
+++ b/include/astra/Singleton.h
@@ -86,14 +86,14 @@ class Singleton {
 // 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<> void Singleton<T >::construct() { assert(!m_singleton); 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<> void Singleton<A,B >::construct() { m_singleton = new A,B(); } \
+template<> void Singleton<A,B >::construct() { assert(!m_singleton); m_singleton = new A,B(); } \
 template<> A,B* Singleton<A,B >::m_singleton = 0
 
 } // end namespace
-- 
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