// crt_setbrkal.c
// compile with: -D_DEBUG /MTd -Od -Zi -W3 /c /link -verbose:lib -debug

/*
 * In this program, a call is made to the _CrtSetBreakAlloc routine
 * to verify that the debugger halts program execution when it reaches
 * a specified allocation number.
 */

#include <malloc.h>
#include <crtdbg.h>

int main( )
{
        long allocReqNum;
        char *my_pointer;

        /* 
         * Allocate "my_pointer" for the first
         * time and ensure that it gets allocated correctly
         */
        my_pointer = malloc(10);
        _CrtIsMemoryBlock(my_pointer, 10, &allocReqNum, NULL, NULL);

        /* 
         * Set a breakpoint on the allocation request
         * number for "my_pointer"
         */
        _CrtSetBreakAlloc(allocReqNum+2);
        _crtBreakAlloc = allocReqNum+2;

        /* 
         * Alternate freeing and reallocating "my_pointer"
         * to verify that the debugger halts program execution
         * when it reaches the allocation request
         */
        free(my_pointer);
        my_pointer = malloc(10);
        free(my_pointer);
        my_pointer = malloc(10);
        free(my_pointer);
}