在共享内存中使用自定义分配器实例化类

我拔头发是因为以下问题:我在跟踪 the example 在boost.interprocess文档中给出,用于实例化我在共享内存中编写的固定大小的环形缓冲区缓冲类。我的类的骨架构造函数是:

template<typename ItemType, class Allocator >
SharedMemoryBuffer<ItemType, Allocator>::SharedMemoryBuffer( unsigned long capacity ){

    m_capacity = capacity;

    // Create the buffer nodes.
    m_start_ptr = this->allocator->allocate();  // allocate first buffer node
    BufferNode* ptr = m_start_ptr;
    for( int i = 0 ; i < this->capacity()-1; i++ ) {
        BufferNode* p = this->allocator->allocate();    // allocate a buffer node
    }
}

我的第一个问题:这种分配是否保证缓冲区节点被分配到相邻的内存位置,即当我试图从地址访问第n个节点时 m_start_ptr + n*sizeof(BufferNode) 在我的 Read() 方法有用吗?如果没有,还有什么更好的方法来保存节点,创建链接列表?

我的测试线束如下:

// Define an STL compatible allocator of ints that allocates from the managed_shared_memory.
// This allocator will allow placing containers in the segment
typedef allocator<int, managed_shared_memory::segment_manager>  ShmemAllocator;

//Alias a vector that uses the previous STL-like allocator so that allocates
//its values from the segment
typedef SharedMemoryBuffer<int, ShmemAllocator> MyBuf;

int main(int argc, char *argv[]) 
{
    shared_memory_object::remove("MySharedMemory");

    //Create a new segment with given name and size
    managed_shared_memory segment(create_only, "MySharedMemory", 65536);

    //Initialize shared memory STL-compatible allocator
    const ShmemAllocator alloc_inst (segment.get_segment_manager());

    //Construct a buffer named "MyBuffer" in shared memory with argument alloc_inst
    MyBuf *pBuf = segment.construct<MyBuf>("MyBuffer")(100, alloc_inst);
}

这将给出与最后一条语句的模板相关的所有编译错误。我做错什么了?是 segment.construct<MyBuf>("MyBuffer")(100, alloc_inst) 提供这两个模板参数的正确方法是什么?