log2.hpp

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#ifndef __STAN__MATH__FUNCTIONS__LOG2_HPP__
#define __STAN__MATH__FUNCTIONS__LOG2_HPP__

#include <stdexcept>
#include <boost/math/tools/promotion.hpp>
#include <stan/math/constants.hpp>

namespace stan {

  namespace math {

    template <typename T>
    inline typename boost::math::tools::promote_args<T>::type
    log2(const T a) {
      using std::log;
      return log(a) / LOG_2;
    }

    inline double log2() {
      return LOG_2;
    }

  }
}

#endif