lbeta.hpp

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#ifndef __STAN__MATH__FUNCTIONS__LBETA_HPP__
#define __STAN__MATH__FUNCTIONS__LBETA_HPP__

#include <boost/math/tools/promotion.hpp>

#include <boost/math/special_functions/gamma.hpp>

namespace stan {
  namespace math {

    template <typename T1, typename T2>
    inline typename boost::math::tools::promote_args<T1,T2>::type
    lbeta(const T1 a, const T2 b) {
      using boost::math::lgamma;
      return lgamma(a)
        + lgamma(b)
        - lgamma(a + b);
    }

  }
}

#endif