sum.hpp

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#ifndef STAN_MATH_PRIM_FUN_SUM_HPP
#define STAN_MATH_PRIM_FUN_SUM_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <cstddef>
#include <numeric>
#include <vector>
 
namespace stan {
namespace math {
 
template <typename T, require_stan_scalar_t<T>* = nullptr>
inline T sum(T&& m) {
  return std::forward<T>(m);
}
 
template <typename T, require_not_autodiff_t<T>* = nullptr>
inline T sum(const std::vector<T>& m) {
  return std::accumulate(m.begin(), m.end(), T{0});
}
 
template <typename T, require_eigen_vt<std::is_arithmetic, T>* = nullptr>
inline value_type_t<T> sum(const T& m) {
  return m.sum();
}
 
template <typename T, require_eigen_vt<is_complex, T>* = nullptr>
inline value_type_t<T> sum(const T& m) {
  return m.sum();
}
 
}  // namespace math
}  // namespace stan
 
#endif