possibly_sum.hpp

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#ifndef STAN_MATH_PRIM_META_POSSIBLY_SUM_HPP
#define STAN_MATH_PRIM_META_POSSIBLY_SUM_HPP
 
#include <stan/math/prim/fun/sum.hpp>
#include <stan/math/prim/meta/require_helpers.hpp>
 
namespace stan {
namespace math {
 
template <typename CondSum, typename T, require_t<CondSum>* = nullptr>
inline auto possibly_sum(T&& x) {
  return sum(std::forward<T>(x));
}
 
template <typename CondSum, typename T1, require_not_t<CondSum>* = nullptr>
inline auto possibly_sum(T1&& x) {
  return std::forward<T1>(x);
}
 
}  // namespace math
}  // namespace stan
 
#endif