C / C++ / MFC

// Test.h

#ifndef __TEST_H__
#define __TEST_H__

class CTestClass1
{
	int m_donothing;
public:
	CTestClass() : m_donothing(0) {}
};

class CTestClass2
{
#ifdef TEST_CTESTCLASS
	CTestClass1* m_pTestClass1;
#endif

public:
	CTestClass2();
}

#endif // __TEST_H__

// Test.cpp

#include "stdafx.h"

#define TEST_CTESTCLASS
#include "Test.h"

CTestClass2::CTestClass2()
{
#ifdef TEST_CTESTCLASS
	m_pTestClass1 = NULL;	// causes overrun (~382 bytes)
#endif
}

// Test.h

#ifndef __TEST_H__
#define __TEST_H__

#define TEST_CTESTCLASS

class CTestClass1
{
	int m_donothing;
public:
	CTestClass() : m_donothing(0) {}
};

class CTestClass2
{
#ifdef TEST_CTESTCLASS
	CTestClass1* m_pTestClass1;
#endif

public:
	CTestClass2();
}

#endif // __TEST_H__

// Test.cpp

#include "stdafx.h"
#include "Test.h"

CTestClass2::CTestClass2()
{
#ifdef TEST_CTESTCLASS
	m_pTestClass1 = NULL;	// does not cause overrun
#endif
}

// Header file
class CFoo
{
public:
	CFoo();
	~CFoo();
	BOOL SortByName();
	// Other functions declared here...

protected:
	std::vector<CRec*> m_Recs; // CRec is a class with CStrings, etc.

private:
	struct NameComparer
	{
		bool operator()(const CRec* A,const CRec* B)
		{
			return ((A->m_strName) < (B->m_strName));
		}
	};
};


// CPP file
// Other functions are defined here...
BOOL CFoo::SortByName()
{
	std::stable_sort(m_Recs.begin(), m_Recs.end(), NameComparer());

	return TRUE;
}