#include <vector>
// using std::vector
#include <cstdio>
// using std::printf

std::vector<const char*> calltrace;

#define trace(x) calltrace.push_back(#x); x; calltrace.pop_back();

namespace {
  void foo(int z)
  {
    std::printf("Calltrace contains:\n");
    for(std::vector<const char*>::iterator i = calltrace.begin(),
	  end = calltrace.end(); i != end; ++i)
      std::printf("\t%s\n", *i);
    std::printf("\n");
  }

  void bar()
  {
    int x = 0, y = 1;
    trace(int z = x + y)
    trace(foo(z))
  }
}

int main()
{
  trace(bar())
}