Help on passing a function to a function pointer.

[Kirill]

I am exploring GLFW with D (bindbc-glfw). I faced the following 
problem:

I need to set the frame buffer size callback:
`glfwSetFramebufferSizeCallback(GLFWwindow*, extern (C) void 
function(GLFWwindow*, int, int) nothrow)`

I have created a function:
`extern (C) void setFrameBufferSizeCallback(GLFWwindow* window, 
int w, int h) nothrow {
         glfwViewport(0, 0, w, h);
}`

And then:
`glfwSetFramebufferSizeCallback(window, 
&setFrameBufferSizeCallback)`

DMD produces the following error:
`source/display.d(59,32): Error: function pointer 
glfwSetFramebufferSizeCallback(GLFWwindow*, extern (C) void 
function(GLFWwindow*, int, int) nothrow)
is not callable using argument types
(GLFWwindow*, extern (C) void delegate(GLFWwindow* window, int w, 
int h) nothrow)

source/display.d(59,32): cannot pass argument
&this.frameBufferSizeCallback of type extern (C) void 
delegate(GLFWwindow* window, int w, int h) nothrow to parameter 
extern (C) void function(GLFWwindow*, int, int) nothrow
dmd failed with exit code 1.
`

What should I do? I have read the available information on D 
function pointers, but I still can't get it working. What am I 
missing?