将 memory 分配给 std::array 时出错

Question

我的意图是将队列中的图像缓冲区传递给其他一些 function（在另一个线程中）进行处理，使用http://www.cplusplus.com/reference/array/array/data/中的示例。以下错误：

error: request for member ‘data’ in ‘frame’, which is of non-class type ‘std::array<unsigned char, 345600>()’

和

error: no matching function for call to ‘std::deque<std::array<unsigned char, 345600> >::push_back(std::array<unsigned char, 345600> (&)())’

这是我的代码，我想知道错误在哪里

// Declaration of array  
std::deque<std::array<unsigned char, FRAME_WIDTH * FRAME_HEIGHT>> frameQueue;

// some processing
// some processing take place and the output is some buffer buf , type unsigned char 

// declare an array object
std::array<unsigned char, FRAME_HEIGHT * FRAME_WIDTH> frame();

// set the array with memory from buf
std::memcpy (frame.data(), buf, FRAME_HEIGHT * FRAME_WIDTH);

// push it into queue
frameQueue.push_back(frame);

谢谢

Answer 1

我认为你不应该在这一行的框架前使用括号：

std::array<unsigned char, FRAME_HEIGHT * FRAME_WIDTH> frame();

正确的命令是：

std::array<unsigned char, FRAME_HEIGHT * FRAME_WIDTH> 帧；