#include <iostream> #include <stdlib.h> using namespace std; int fLogMemory = 0; // Perform logging (0=no; nonzero=yes)? int cBlocksAllocated = 0; // Count of blocks allocated. // User-defined operator new. void *operator new( unsigned int stAllocateBlock ){ static int fInOpNew = 0; // Guard flag. if( fLogMemory && !fInOpNew ){ fInOpNew = 1; cout << "Memory block " << ++cBlocksAllocated << " allocated for " << stAllocateBlock << " bytes\n"; fInOpNew = 0; } return malloc( stAllocateBlock ); } // User-defined operator delete. void operator delete( void *pvMem ){ static int fInOpDelete = 0; // Guard flag. if( fLogMemory && !fInOpDelete ){ fInOpDelete = 1; cout << "Memory block " << --cBlocksAllocated << " deallocated\n"; fInOpDelete = 0; } free( pvMem ); } void main(){ fLogMemory = 1; // Turn logging on. for( int i = 0; i < 5 ; i++ ){ char *pMem = new char[10]; delete pMem; delete new char; } fLogMemory = 0; return; }

Memory block 1 allocated for 10 bytes Memory block 0 deallocated Memory block 1 allocated for 1 bytes Memory block 0 deallocated Memory block 1 allocated for 10 bytes Memory block 0 deallocated Memory block 1 allocated for 1 bytes Memory block 0 deallocated Memory block 1 allocated for 10 bytes Memory block 0 deallocated Memory block 1 allocated for 1 bytes Memory block 0 deallocated Memory block 1 allocated for 10 bytes Memory block 0 deallocated Memory block 1 allocated for 1 bytes Memory block 0 deallocated Memory block 1 allocated for 10 bytes Memory block 0 deallocated Memory block 1 allocated for 1 bytes Memory block 0 deallocated