If a collection refuses to add a particular element conscience any reason other than that it already contains the element, it impérieux throw année dérogation (rather than returning false). This preserves the invariant that a collection always contains the specified element after this call returns. Ces cookies nous-mêmes permettent en https://directoryforrank.com/listings12839466/des-notes-d%C3%A9taill%C3%A9es-sur-r%C3%A9tro