make_holder_tuple.hpp

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#ifndef STAN_MATH_PRIM_FUNCTOR_MAKE_HOLDER_TUPLE_HPP
#define STAN_MATH_PRIM_FUNCTOR_MAKE_HOLDER_TUPLE_HPP
 
#include <stan/math/prim/functor/apply.hpp>
#include <stan/math/prim/meta.hpp>
#include <functional>
#include <tuple>
#include <utility>
 
namespace stan {
namespace math {
namespace internal {
 
template <typename T>
struct deduce_cvr {
  using type
      = std::conditional_t<std::is_rvalue_reference_v<T>, std::decay_t<T>, T&&>;
};
 
template <typename T>
using deduce_cvr_t = typename deduce_cvr<T>::type;
}  // namespace internal
template <typename... Types>
inline constexpr auto make_holder_tuple(Types&&... args) {
  if constexpr (sizeof...(Types) == 0) {
    return std::tuple<>{};
  } else {
    return std::tuple<internal::deduce_cvr_t<Types&&>...>{
        std::forward<Types>(args)...};
  }
}
}  // namespace math
}  // namespace stan
#endif