why alloc

why.cpp

#include <memory_resource>

int main(int argc,char** argv){
  void* buffer;
  std::pmr::monotonic_buffer_resource resource(buffer,8,std::pmr::null_memory_resource());
  //      When Above commented out:
  //  
  //valgrind ./a.out
  //==68433== HEAP SUMMARY:
  //==68433==     in use at exit: 0 bytes in 0 blocks
  //==68433==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
  //  
  //  
  //      When *not* commented out:
  //==68511== HEAP SUMMARY:
  //==68511==     in use at exit: 0 bytes in 0 blocks
  //==68511==   total heap usage: 1 allocs, 1 frees, 72,704 bytes allocated
  //  
  //  
  //Built with: g++ (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
  return 0;
}