std::chrono::operator!=(C++11)

namespace std {
namespace chrono {
  template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator!=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
}}

#include <cassert>
#include <chrono>

using namespace std::chrono;

int main()
{
  const bool result = seconds(3) != seconds(2);
  assert(result);
}