Method shrink_to_fit

include/prealloced_array.h:553–571

Requests the container to reduce its capacity to fit its size. */

    Requests the container to reduce its capacity to fit its size.
   */
  void shrink_to_fit() {
    // Cannot shrink the pre-allocated array.
    if (using_inline_buffer()) return;
    // No point in swapping.
    if (size() == capacity()) return;
    Prealloced_array tmp(m_psi_key, begin(), end());
    if (size() <= Prealloc) {
      /*
        The elements fit in the pre-allocated array. Destruct the
        heap-allocated array in this, and copy the elements into the
        pre-allocated array.
      */
      this->~Prealloced_array();
      new (this) Prealloced_array(tmp.m_psi_key, tmp.begin(), tmp.end());
    } else {
      // Both this and tmp have a heap-allocated array. Swap pointers.
      swap(tmp);
    }
  }

  /**
    Resizes the container so that it contains n elements.