Re: [Dev-C++] Can't use not-operator with non-bool?

[Daniel G. <sp...@ho...>]

mode needs a type.

You are passing !mode as a parameter to a function aren't you? You can only 
use ! in a conditional statement. So you might do

// Your new function
bool CheckMode(bool mode)
{
   return mode;
};


// In your code, in the function call pass in the result of ChekMode
mode = SDL_WM_GrabInput( !CheckMode(mode) );


OR better still, try the following:

switch (mode)
{
   case: SDL_GRAB_ON
   //... do something
   break;

   default:
   //... something else
}

Any help?


void HotKey_ToggleGrab(void)
{
SDL_GrabMode mode;

printf("Ctrl-G: toggling input grab!\n");
mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
if ( mode == SDL_GRAB_ON ) {
printf("Grab was on\n");
} else {
printf("Grab was off\n");
}
mode = SDL_WM_GrabInput(!mode); /* Error occurs here */
if ( mode == SDL_GRAB_ON ) {
printf("Grab is now on\n");
} else {
printf("Grab is now off\n");
}
}




>From: Ken Mortimer <gr...@ta...>
>To: dev...@li...
>Subject: [Dev-C++] Can't use not-operator with non-bool?
>Date: Sat, 22 Mar 2003 00:04:41 -0500
>
>Hey all,
>I've been having problems compiling a test program that comes with the CVS 
>build of SDL (for those of you familiar with it)... My problem is that a 
>function in the source uses the not-operator ( ! ) on non-bool datatypes... 
>Can C++ not use this operator on non-bool?
>
>void HotKey_ToggleGrab(void)
>{
>SDL_GrabMode mode;
>
>printf("Ctrl-G: toggling input grab!\n");
>mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
>if ( mode == SDL_GRAB_ON ) {
>printf("Grab was on\n");
>} else {
>printf("Grab was off\n");
>}
>mode = SDL_WM_GrabInput(!mode); /* Error occurs here */
>if ( mode == SDL_GRAB_ON ) {
>printf("Grab is now on\n");
>} else {
>printf("Grab is now off\n");
>}
>}
>
>The errors reported are as follows:
>
>C:\SDL-1.2.6\test\testwm.c
>[Warning] In function `void HotKey_ToggleGrab()':
>
>96
>C:\SDL-1.2.6\test\testwm.c
>cannot convert `bool' to `SDL_GrabMode'
>
>C:\Documents and Settings\Granoblastic Man\My Documents\Dev-C++ 
>Projects\Makefile.win
>[Build Error] [../../../../SDL-1.2.6/test/testwm.o] Error 1
>
>
>
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