text: #if !defined (GUI_UTILITY_H)
  #define GUI_UTILITY_H
  
  #include "gui_window.h"
  
  #define ASSERT(x) if (!(x)) { wnd_die_gracefully ("Assertion failed: %s\nFile: %s\nLine: %d", #x, __FILE__, __LINE__); }
  
  void utility_copy_to_clipboard (const char* text);
  char* utility_get_from_clipboard ();
  
  bool utility_is_integer (const char* text);
  
  char* utility_int_to_string (int value);
  int utility_string_to_int (char* str);
  
  #endif