special>;</span>
  <span class=identifier>std</span><span class=special>::</span><span class=identifier>string</span> <span class=identifier>phone_number</span><span class=special>;</span>

  <span class=identifier>phonebook_entry</span><span class=special>(</span>
    <span class=identifier>std</span><span class=special>::</span><span class=identifier>string</span> <span class=identifier>family_name</span><span class=special>,</span>
    <span class=identifier>std</span><span class=special>::</span><span c