C / C++ / MFC

void clear()
{
   split();
}

Stuart Dootson wrote:

See, when VC++ instantiates the call to clear, it needs to instantiate the template class Array<array<arrayelement>*>. It wants a vtable for that class, so it'll need an instantiation of split for that class. While instantiating split, it'll need to instantiate the call to clear, so it'll instantiate the class Array<array<array<arrayelement>*>*>....

And so on, ad infinitum...

Stuart Dootson wrote:

void clear()
{
split();
}



g++ won't compile this, giving an error message very similar to the VC++ warnings you were getting.

o.kauert wrote:

But it makes no sense to me as the compiler should only generate code that is USED.

o.kauert wrote:

Err, what you are doing here is an OBVIOUS recursion that could not even be executed without stack overflow

o.kauert wrote:

What it's really about is code generation that does take place although the generated code is not actually needed. I will certainly never ever use a Array<Array<Array<Array<Array<Array<Array<Array<ArrayElement>...> container ANYWHERE So why does the compiler think I will?

Stuart Dootson wrote:

o.kauert wrote:
What it's really about is code generation that does take place although the generated code is not actually needed. I will certainly never ever use a Array<array<array<array<array<array<array<array<arrayelement>...> container ANYWHERE So why does the compiler think I will?



Because it's unable to see as far as you - it doesn't have the knowledge of your design intent. It has to follow pre-defined rules about what to instantiate.

o.kauert wrote:

I will soon try GCC and see what happens.

Stuart Dootson wrote:

Oh, your code compiles fine with gcc. I tried that pretty much first, as I suspected a VC++-specific issue.

lctrncs wrote:

PlaySound(MAKEINTRESOURCE, pRandomSound, GetModuleHandle(NULL), SND_SYNC|SND_RESOURCE);

lctrncs wrote:

BOOL PlaySound(
LPCSTR pszSound,
HMODULE fdwSound,
DWORD fdwSound)

There are two arguments:

LPCSTR (pszSound) and HMODULE (fdwSound)
pRandomSound and GetModuleHandle(NULL)

and two flags:

DWORD fdwSound
SND_SYNC|SND_RESOURCE

//Resources.h
#define SOUND_1

//MyApp.rc
...
SOUND_1  WAV "snd1.wav"
"MOO"    WAV "moo.wav"

PlaySound(MAKEINTRESOURCE(SOUND_1), ...);
PlaySound("MOO", ...);

//Create random resource ID (similar approach used to create random wave file names)

	int m_nRandomSound;
	m_nRandomSound = getrandom( 500, 509  );		//Place the random number into the variable n_nRandomRecord

	CString m_sStrRandomSound;						
	m_sStrRandomSound = "";

	CString m_sStrRandomResourcePrefix;			//Create the resource prefix
	m_sStrRandomResourcePrefix = "IDR_WAVE_";

	m_sStrRandomSound.Format("%d", m_nRandomSound);	//Convert the random integer to a CString


//Concatentate the strings into the resource identifier
	CString m_sStrRandomResourcePrefixWav;
	m_sStrRandomResourcePrefixWav = m_sStrRandomResourcePrefix + m_sStrRandomSound;

	
//Set the resource identifier directly
	CString m_sStrRandomResourcePrefixWav2;
	m_sStrRandomResourcePrefixWav2="IDR_WAVE_503";


//  
//
//Demonstrate function similar method that plays sounds using concatenated CString of path/filename
PlaySound(m_sStrRandomSoundPathWav, GetModuleHandle(NULL),  SND_FILENAME|SND_SYNC );  
          //PLAYS from concatenated CString 
          //(e.g. \path\filename?.wav - where ? is an integer converted to a CString)


PlaySound(MAKEINTRESOURCE(IDR_WAVE_503), GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );
          //PLAYS IDR_WAVE_503
          //which is directly entered an not subtituted in any way
//
//
//ATTEMPTS TO EMPLOY CONCATENATED STRING TO PLAY RANDOM WAVE FILE

//PlaySound(MAKEINTRESOURCE(m_sStrRandomResourcePrefixWav), GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );
          //error C2440: 'type cast' : cannot convert from 'class CString' to 'unsigned short'
          //included for completeness 


//PlaySound(IDR_WAVE_503, GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );	
          //error C2664: 'PlaySoundA' : cannot convert parameter 1 from 'const int' to 'const char *'
          //included for completeness 


PlaySound(m_sStrRandomResourcePrefixWav2, GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );
          //Compiles but wav not played - 
          //Visual Studio reports (directly intialized as IDR_WAVE 503) m_sStrRandomResourcePrefixWav as "IDR_WAVE 503"


PlaySound("m_sStrRandomResourcePrefixWav", GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );
          //Compiles but wav not played - 
          //Visual Studio reports (CONCATENATED CString IDR_WAVE 503) m_sStrRandomResourcePrefixWav as "IDR_WAVE 503"


//
//
//Attempt to cast the CString to an unsigned short

LPCTSTR pRandomSound = m_sStrRandomResourcePrefixWav.GetBuffer(0);	
LPCTSTR pRandomSound2 = m_sStrRandomResourcePrefixWav2.GetBuffer(0);
//

PlaySound(MAKEINTRESOURCE(pRandomSound2), GetModuleHandle(NULL),  SND_SYNC|SND_RESOURCE );
          //Compiles but wav not played - 
          //Visual Studio reports (directly intialized as IDR_WAVE 503) m_sStrRandomResourcePrefixWav as 0x02bd08bc "IDR_WAVE 503"
//

PlaySound(MAKEINTRESOURCE(pRandomSound), AfxGetResourceHandle(),  SND_SYNC|SND_RESOURCE );
          //Compiles but wav not played - 
          //Visual Studio reports (concatenated as IDR_WAVE 503) m_sStrRandomResourcePrefixWav as 0x02bd092c "IDR_WAVE 503"
//

PlayWav(pRandomSound);      //A different approach employing loading/locking resource
          //behaves similarly
          //Compiles but wav not played - 
          //Visual Studio reports (concatenated as IDR_WAVE 503) m_sStrRandomResourcePrefixWav as 0x02bd092c "IDR_WAVE 503" etc.
//

m_sStrRandomResourcePrefixWav.ReleaseBuffer();
m_sStrRandomResourcePrefixWav2.ReleaseBuffer();

mohant$.net wrote:

fprintf(fp, "Input string = %s\n", Work);

But i want to write log file with much details which is help me to debug.Please gimme me if any prebuild code or related link.

CFileStatus status;
if( CFile::GetStatus( OpenFile, status ) )
{
  if(status.m_attribute==0x01)
   AfxMessageBox(_T("readOnly"));
}