primitive_value.hpp

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#ifndef STAN__MATH__FUNCTIONS__PRIMITIVE_VALUE_HPP
#define STAN__MATH__FUNCTIONS__PRIMITIVE_VALUE_HPP

#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
#include <stan/math/functions/value_of.hpp>

namespace stan {

  namespace math {

    template <typename T>
    inline 
    typename boost::enable_if<boost::is_arithmetic<T>, T>::type
    primitive_value(T x) {
      return x;
    }

    template <typename T>
    inline
    typename boost::disable_if<boost::is_arithmetic<T>, double>::type
    primitive_value(const T& x) {
      using stan::math::value_of;
      return value_of(x);
    }

  }

}

#endif