C / C++ / MFC

himangshuS wrote:

B *ptr;
funMain(ptr);


My doubt::
Should I write B *ptr or
B *ptr = new B();

B * ptr;
ptr = new B();
funMain(ptr);

himangshuS wrote:

void fn()=0;

Mike the Red wrote:

I recall that vector<> leaks unless I call vector<>.clear() when I'm done with the vector.

Mike the Red wrote:

Does that mean, considering RAII, that whenever I want to use std::vector the best-practice method would be to write a specialized container class that calls .clear() in the destructor and exposes all the std::vector methods?

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
	vector<char *> vc;
	vc.push_back("test");
	_CrtDumpMemoryLeaks();
	return 0;
}<hr>Detected memory leaks!
Dumping objects ->
c:\program files\microsoft visual studio .net 2003\vc7\include\crtdbg.h(689) : {44} normal block at 0x008A0FF0, 4 bytes long.
 Data: <  C > A0 A5 43 00 
Object dump complete.
The program '[7368] ConTest.exe: Native' has exited with code 0 (0x0).

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
	{
		vector<char *> vc;
		vc.push_back("test");
	}
	_CrtDumpMemoryLeaks();
	return 0;
}

#include <iostream>
#include <tchar.h>
#include <vector>

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );

	{
		vector<char *> vc;
		vc.push_back("test");
	}

	_CrtDumpMemoryLeaks();

	return 0;
}