C function take a function as parameter

Take stb image library as example:

     int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data, int stride_in_bytes);
     int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
     int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
     int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
     int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);

   where the callback is:
      void stbi_write_func(void *context, void *data, int size);

Corresponding Zig function.

 fn stbWriteCallback(context: ?*anyopaque, data: ?*anyopaque, size: c_int) callconv(.C) void {
    const array_list: *std.ArrayList(u8) = @ptrCast(@alignCast(context.?));
    const bytes: [*]const u8 = @ptrCast(data.?);
    const bytes_slice: []const u8 = bytes[0..@as(usize, @intCast(size))];
    array_list.appendSlice(bytes_slice) catch unreachable;
}