[Rcpp-devel] Does uncaught c++ exception cause memory leak?

[Dirk Eddelbuettel]

PS  Here is a better variant that actually leaks:

edd at max:/tmp$ cat leak.cpp                                                                                                                                                                                           

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cmath>

int main() {
  double *d = new double[1024];
  if (d) std::cout << "Allocated" << std::endl;
  double e = std::exp(1.0);
  d = &e;
  exit(0);
}
edd at max:/tmp$ g++ -Wall -o leak leak.cpp                                                                                                                                                                             
edd at max:/tmp$ valgrind  ./leak                                                                                                                                                                                       
==16924== Memcheck, a memory error detector
==16924== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==16924== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==16924== Command: ./leak
==16924== 
Allocated
==16924== 
==16924== HEAP SUMMARY:
==16924==     in use at exit: 8,192 bytes in 1 blocks
==16924==   total heap usage: 1 allocs, 0 frees, 8,192 bytes allocated
==16924== 
==16924== LEAK SUMMARY:
==16924==    definitely lost: 8,192 bytes in 1 blocks
==16924==    indirectly lost: 0 bytes in 0 blocks
==16924==      possibly lost: 0 bytes in 0 blocks
==16924==    still reachable: 0 bytes in 0 blocks
==16924==         suppressed: 0 bytes in 0 blocks
==16924== Rerun with --leak-check=full to see details of leaked memory
==16924== 
==16924== For counts of detected and suppressed errors, rerun with: -v
==16924== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
edd at max:/tmp$ 

By overwriting d the memory is lost for good, and valgrind notices as you;d
think it would.

Dirk

-- 
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org