Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Header <boost/numeric/odeint/integrate/max_step_checker.hpp>

namespace boost {
  namespace numeric {
    namespace odeint {
      class failed_step_checker;
      class max_step_checker;
    }
  }
}