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#ifndef ASSERT
#ifdef NDEBUG
#define ASSERT(x) { false ? (void)(x) : (void)0; }
#else
#ifdef _WIN32
#define ASURA_DEBUG_BREAK() __debugbreak()
#else
#define ASURA_DEBUG_BREAK() raise(SIGTRAP)
#endif
#define ASSERT(x) do { const volatile bool asura_assert_b____ = !(x); if(asura_assert_b____) ASURA_DEBUG_BREAK(); } while (false)
#endif
#endif
///
/// ̳Singletonڵһʵʱʵ֮ٴʵᱨ
///
template<class T>
class Singleton
{
public:
static T* Get()
{
// ֮ǰûдһ
if (!instance) instance = new T;
// ʵ
return instance;
}
static void Destroy()
{
delete instance;
instance = nullptr;
}
protected:
Singleton()
{
// instanceζִһʵǴġ
ASSERT(!instance);
// ʵΪʵ
instance = static_cast<T*>(this);
};
virtual ~Singleton() {};
static T* instance;
private:
Singleton(const Singleton& singleton);
Singleton& operator = (const Singleton& singleton);
};
template<class T>
T* Singleton<T>::instance = nullptr;
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