r/src/imports.cpp

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
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// under the License.

#include <R_ext/Rdynload.h>  // for R_GetCCallable
#include <Rdefines.h>

namespace vctrs {
struct vctrs_api_ptrs_t {
  R_len_t (*short_vec_size)(SEXP x);

  vctrs_api_ptrs_t() {
    short_vec_size = (R_len_t(*)(SEXP))R_GetCCallable("vctrs", "short_vec_size");
  }
};

const vctrs_api_ptrs_t& vctrs_api() {
  static vctrs_api_ptrs_t ptrs;
  return ptrs;
}

R_len_t vec_size(SEXP x) {
  if (Rf_inherits(x, "data.frame") || TYPEOF(x) != VECSXP || Rf_inherits(x, "POSIXlt")) {
    return vctrs_api().short_vec_size(x);
  } else {
    return Rf_length(x);
  }
}

}  // namespace vctrs