accumulator.hpp

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#ifndef STAN_MATH_PRIM_FUN_ACCUMULATOR_HPP
#define STAN_MATH_PRIM_FUN_ACCUMULATOR_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/sum.hpp>
#include <vector>
#include <type_traits>
 
namespace stan {
namespace math {
 
template <typename T, typename = void>
class accumulator {
 private:
  std::vector<T> buf_;
 
 public:
  template <typename S, typename = require_stan_scalar_t<S>>
  inline void add(S x) {
    buf_.push_back(x);
  }
 
  template <typename S, require_matrix_t<S>* = nullptr>
  inline void add(const S& m) {
    buf_.push_back(stan::math::sum(m));
  }
 
  template <typename S>
  inline void add(const std::vector<S>& xs) {
    for (size_t i = 0; i < xs.size(); ++i) {
      this->add(xs[i]);
    }
  }
 
#ifdef STAN_OPENCL
 
  template <typename S,
            require_all_kernel_expressions_and_none_scalar_t<S>* = nullptr>
  inline void add(const S& xs) {
    buf_.push_back(stan::math::sum(xs));
  }
 
#endif
 
  inline T sum() const { return stan::math::sum(buf_); }
};
 
}  // namespace math
}  // namespace stan
 
#endif