resize.hpp

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#ifndef STAN_MATH_PRIM_FUN_RESIZE_HPP
#define STAN_MATH_PRIM_FUN_RESIZE_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <vector>
 
namespace stan {
namespace math {
namespace internal {
template <typename T, int R, int C>
inline void resize(Eigen::Matrix<T, R, C>& x, const std::vector<int>& dims,
                   int pos) {
  x.resize(dims[pos], dims[pos + 1]);
}
 
template <typename T>
inline void resize(T /*x*/, const std::vector<int>& /*dims*/, int /*pos*/) {
  // no-op
}
 
template <typename T>
inline void resize(std::vector<T>& x, const std::vector<int>& dims, int pos) {
  x.resize(dims[pos]);
  ++pos;
  if (pos >= static_cast<int>(dims.size())) {
    return;  // skips lowest loop to scalar
  }
  for (size_t i = 0; i < x.size(); ++i) {
    resize(x[i], dims, pos);
  }
}
}  // namespace internal
 
template <typename T>
inline void resize(T& x, std::vector<int> dims) {
  internal::resize(x, dims, 0U);
}
 
}  // namespace math
}  // namespace stan
 
#endif