Method metadata_num

tiledb/sm/cpp_api/array.h:1146–1152

* Returns then number of metadata items in an open array. The array must * be opened in READ mode, otherwise the function will error out. */

   * be opened in READ mode, otherwise the function will error out.
   */
  uint64_t metadata_num() const {
    uint64_t num;
    auto& ctx = ctx_.get();
    tiledb_ctx_t* c_ctx = ctx.ptr().get();
    ctx.handle_error(tiledb_array_get_metadata_num(c_ctx, array_.get(), &num));
    return num;
  }

  /**
   * It gets a metadata item from an open array using an index.