test

#include <cstring>
#include <iostream>

char buf[256];
size_t idx = 0;

void *malloc(size_t size) {
  void* res = &buf[idx];
  memset(res, 0xFF, size);
  idx += size;
  return res;
}

void free(void* ptr) {
  (void)ptr;
}

int main() {
  {
    int* i = new int;
    std::cout << *i << std::endl;
    delete i;
  }

  {
    int* i = new int();
    std::cout << *i << std::endl;
    delete i;
  }
}

[environment]
os : 14.04.1-Ubuntu 64 bit
compiler : g++ (Ubuntu 4.8.2-19ubuntu1) 4.8.2
build : g++ -std=c++11 test.cpp

[result]
-1
0