c++ - 静态函数调用时出现错误 “C++ requires a type specifier for all declarations”

我有一个用于分配器的静态内存池:

template<typename Tag>
struct AllocatorPool {
  static void initialize(size_t bytes)
  {
    gPool.allocatePool(bytes);
  }
    typedef AllocatorImpl::Pool tPool;
    static tPool gPool;
};

内存池的定义:

template<typename T> typename AllocatorPool<T>::tPool AllocatorPool<T>gPool;

如果我想像这样初始化池:

AllocatorPool<MyClass>::initialize(1024);

编译器为此行输出以下错误:

"C++ requires a type specifier for all declarations"

我使用Xcode 4.6.3和Apple LLVM编译器4.2

最佳答案

尝试改变

template<typename T> typename AllocatorPool<T>::tPool AllocatorPool<T>gPool;

至

template<typename T> typename AllocatorPool<T>::tPool AllocatorPool<T>::gPool;
// note the scope resolution operator --------------------------------^^