Simple, type and thread safe C++11 console logging function

log.cc

#include <iostream>
#include <mutex>

std::recursive_mutex log_lock;

// If you have ever tried using cerr/cout from multiple threads you may have experienced
// character interleaving. These functions avoid that.
template <typename A>
void log(const A &arg) {
  log_lock.lock();
  std::cerr << arg << std::endl;
  log_lock.unlock();
}

template <typename A0, typename A1, typename ... Args>
void log(const A0 &a0, const A1 &a1, const Args & ... args) {
  log_lock.lock();
  std::cerr << a0;
  log(a1, args...);
  log_lock.unlock();
}

int main() {
  const char *name = "bob";
  log("hello ", name);
}