include_summand.hpp

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#ifndef STAN_MATH_PRIM_META_INCLUDE_SUMMAND_HPP
#define STAN_MATH_PRIM_META_INCLUDE_SUMMAND_HPP
 
#include <stan/math/prim/meta/bool_constant.hpp>
#include <stan/math/prim/meta/is_constant.hpp>
#include <stan/math/prim/meta/scalar_type.hpp>
#include <type_traits>
 
namespace stan {
namespace math {
 
template <bool propto, typename T = double, typename... T_pack>
struct include_summand
    : bool_constant<(!stan::is_constant_all<scalar_type_t<T>>::value
                     || include_summand<propto, T_pack...>::value)> {};
 
template <bool propto, typename T>
struct include_summand<propto, T>
    : bool_constant<(
          !propto
          || !stan::is_constant_all<typename scalar_type<T>::type>::value)> {};
 
}  // namespace math
 
}  // namespace stan
 
#endif