error C2253: 'RefCounted' : pure specifier or abstract override specifier only allowed on virtual

环境：win7 32位,vs2010

源码：

#include <assert.h>

class RefCountedBase {
public:
	void ref()
	{
		++m_refCount;
	}

	bool hasOneRef() const
	{
		return m_refCount == 1;
	}

	unsigned refCount() const
	{
		return m_refCount;
	}

	void relaxAdoptionRequirement()
	{
	}

protected:
	RefCountedBase()
		: m_refCount(1)
	{
	}

	~RefCountedBase()
	{
	}

	// Returns whether the pointer should be freed or not.
	bool derefBase()
	{
		assert(m_refCount);
		unsigned tempRefCount = m_refCount - 1;
		if (!tempRefCount) {
			return true;
		}
		m_refCount = tempRefCount;
		return false;
	}
private:

	unsigned m_refCount;

};

template<typename T> class RefCounted : public RefCountedBase 
{
private: 
	RefCounted(const RefCounted&) = delete; 
	//RefCounted& operator=(const RefCounted&) = delete; 
public:
	void deref()
	{
		if (derefBase())
			delete static_cast<T*>(this);
	}

protected:
	RefCounted() { }
	~RefCounted()
	{
	}
};

int main()
{
	return 0;
}

报错：

1>d:\hbj\test\test0505\test0505\t0506_2.cpp(55): error C2253: 'RefCounted<T>' : pure specifier or abstract override specifier only allowed on virtual function
1>          d:\hbj\test\test0505\test0505\t0506_2.cpp(70) : see reference to class template instantiation 'RefCounted<T>' being compiled
1>

1>Build FAILED.

原因：c++0x新特色：使用或禁用对象的默认函数

vs2010不支持= delete,vs2013是支持的

解决：去掉= delete

参考：http://zh.wikipedia.org/wiki/C%2B%2B11