#ifndef STAN__MATH__REV__CORE__OPERATOR_GREATER_THAN_HPP
#define STAN__MATH__REV__CORE__OPERATOR_GREATER_THAN_HPP

#include <stan/math/rev/core/var.hpp>

namespace stan {
  namespace agrad {

    /**
     * Greater than operator comparing variables' values (C++).
     *
       \f[
       \mbox{operator\textgreater}(x,y) = 
       \begin{cases}
         0 & \mbox{if } x \leq y\\
         1 & \mbox{if } x > y \\[6pt]
         0 & \mbox{if } x = \textrm{NaN or } y = \textrm{NaN}
       \end{cases}
       \f]
     *
     * @param a First variable.
     * @param b Second variable.
     * @return True if first variable's value is greater than second's.
     */
    inline bool operator>(const var& a, const var& b) {
      return a.val() > b.val();
    }

    /**
     * Greater than operator comparing variable's value and double
     * (C++).
     *
     * @param a First variable.
     * @param b Second value.
     * @return True if first variable's value is greater than second value.
     */
    inline bool operator>(const var& a, const double b) {
      return a.val() > b;
    }

    /**
     * Greater than operator comparing a double and a variable's value
     * (C++).
     *
     * @param a First value.
     * @param b Second variable.
     * @return True if first value is greater than second variable's value.
     */
    inline bool operator>(const double a, const var& b) {
      return a > b.val();
    }

  }
}
#endif
