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Understanding Pointers

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Started by Drakk February 13, 2010 01:19 PM

3 comments, last by clashie 14 years, 2 months ago

Drakk

122

Author

February 13, 2010 01:19 PM

I'm new to C++, and I'm still stuck on pointers. Somewhat. The little that I know, would this be possible? I want to send 'Running' to the function "UTIL_CrashProgram" and have that function set 'Running' to false. File: UTIL.h


#ifndef _INCLUDE_H_UTIL
#define _INCLUDE_H_UTIL

// Basic error function
void UTIL_CrashProgram( const char *Reason, bool Dump2File = false, bool *SendRunningBoolHere = true );

#endif

File: Main.cpp


int main( int argc, char* args[] )
{
	// Crash it
	UTIL_CrashProgram("Failed",false,Running);
	return 0;
}

And last: File: Util.cpp


#include "CUtil.h"

void UTIL_CrashProgram( const char Reason, bool Dump2File, bool *SendRunningBoolHere )
{
	SendRunningBoolHere = false;
}

But when I compile, i get the error:


1>c:\users\drak\desktop\editing\mygreatgamev1\mygreatgamev1\cutil.h(11) : error C2548: 'UTIL_CrashProgram' : missing default parameter for parameter 3
1>c:\users\drak\desktop\editing\mygreatgamev1\mygreatgamev1\cmain.cpp(14) : error C2664: 'UTIL_CrashProgram' : cannot convert parameter 3 from 'bool' to 'bool *'

Zakwayda

2,389

February 13, 2010 01:28 PM

Would you be able to post the code in its entirety, specifically the main.cpp file? It'd be easy enough to offer some comments as is, but it'd be a little easier to offer useful feedback if we could see the whole program.

Drakk

122

Author

February 13, 2010 01:30 PM

Here's main:

#include <windows.h>#include "SDL.h"#include "CUtil.h"#include <stdio.h>// Master running boolbool Running = false;// Defines#define MEDIA_DIR "Media"int main( int argc, char* args[] ){	printf("Running: %s\n",Running == true ? "Yes" : "No");	UTIL_CrashProgram("Crash",false,Running);	printf("Running2: %s\n",Running == true ? "Yes" : "No");	system("pause");	return 0;}

All the other files (Util.h/.cpp) are posted fully above.

Mantear

251

February 13, 2010 03:13 PM

Your error is telling you that it can't convert a 'bool' to a 'bool*' on the third parameter. It means just that. Your 3rd parameter is a bool pointer, 'bool *SendRunningBoolHere'. You attempt to give it a default parameter of 'true'. Well, 'true' isn't of type 'bool*', it's of type 'bool'.

clashie

633

February 14, 2010 02:46 PM

Your error message is about as descriptive as you can get, you're trying to pass a bool when it expects a bool*.

You could just prefix 'Running' with a & to signify that you're passing it by address. Set a breakpoint there and check out what happens.

Understanding Pointers

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