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?

On Wednesday, 24 March 2021 at 02:41:39 UTC, Kirill wrote:
> 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)

You're trying to pass a pointer to a member function (a "delegate"), but it expects a pointer to a non-member function. Either make the function `static` or move it outside the class/struct it's currently in.

On Wednesday, 24 March 2021 at 03:06:15 UTC, Paul Backus wrote:
> On Wednesday, 24 March 2021 at 02:41:39 UTC, Kirill wrote:
>> 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)
>
> You're trying to pass a pointer to a member function (a "delegate"), but it expects a pointer to a non-member function. Either make the function `static` or move it outside the class/struct it's currently in.

Thank you! That worked!