index_apply.hpp

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#ifndef STAN_MATH_PRIM_META_INDEX_APPLY_HPP
#define STAN_MATH_PRIM_META_INDEX_APPLY_HPP
#include <utility>
#include <cstddef>
 
namespace stan {
namespace math {
 
namespace internal {
template <class F, std::size_t... Is>
inline constexpr auto index_apply_impl(F&& f, std::index_sequence<Is...>) {
  return std::forward<F>(f)(std::integral_constant<std::size_t, Is>{}...);
}
}  // namespace internal
 
template <std::size_t N, class F>
inline constexpr auto index_apply(F&& f) {
  return internal::index_apply_impl(std::forward<F>(f),
                                    std::make_index_sequence<N>{});
}
 
}  // namespace math
}  // namespace stan
 
#endif  // STAN_MATH_PRIM_META_APPLY_HPP