Originally you were exporting the entire singleton class no? That kinda implies you are trying to do this:

// Implementation MUST be in the cpp file (otherwise it gets redefined in the header file in multiple compilation units) template<typename T> T* Singleton<T>::instance = 0;
// and now we export the class specialisations.
template class DLL_EXPORT Singleton<GameInfo>;
template class DLL_EXPORT Singleton<Logger>;
template class DLL_EXPORT Singleton<SoundManager>;
template class DLL_EXPORT Singleton<SceneManager>;
template class DLL_EXPORT Singleton<ResourceManager>;


If you just want to export the variable only, leaving the rest inline, then :


template DLL_EXPORT GameInfo* Singleton<GameInfo>::instance = 0;
template DLL_EXPORT Logger* Singleton<Logger>::instance = 0;
template DLL_EXPORT SoundManager* Singleton<SoundManager>::instance = 0;
template DLL_EXPORT SceneManager* Singleton<SceneManager>::instance = 0;
template DLL_EXPORT ResourceManager* Singleton<ResourceManager>::instance = 0;


A couple of things, I need to replace DLL_EXPORT with PARTICLESENGINE_API from this:

#ifdef PARTICLESENGINE_DLL 
#define PARTICLESENGINE_API __declspec( dllexport )
#else
#define PARTICLESENGINE_API __declspec( dllimport )
#endif

Also there is this error now:

Error 33 error C2143: syntax error : missing ';' before '=' c:\users\100312531\desktop\project-seventeen\particleengineproject\particlesengine\singleton.cpp 12 1 ParticlesEngine

that happens on each of those variable declaration lines

Ahh yup, you might have wanted this instead. My bad!

// Implementation MUST be in the cpp file (otherwise it gets redefined in the header file in multiple compilation units) template<typename T> T* Singleton<T>::instance = 0; template PARTICLESENGINE_API GameInfo* Singleton<GameInfo>::instance; template PARTICLESENGINE_API Logger* Singleton<Logger>::instance; template PARTICLESENGINE_API SoundManager* Singleton<SoundManager>::instance; template PARTICLESENGINE_API SceneManager* Singleton<SceneManager>::instance; template PARTICLESENGINE_API ResourceManager* Singleton<ResourceManager>::instance;

No Worries, thank you for all your help.

There is one more issue left which is similar but different enough to warrant another post, rather than continue this one.