#include <iostream>

struct Holder
{
  Holder(const std::string& name) : name_(name) { std::cout << name_ << " locked\n"; }
  ~Holder() { std::cout << name_ << " freed\n"; }
  const std::string name_;
};

int main()
{
  Holder holder("resource 1");
  {
    Holder holder("resource 2");
  }
  return 0;
}

resource 1 locked
resource 2 locked
resource 2 freed
resource 1 freed