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====== Function SLOT-MAKUNBOUND ====== ====Syntax==== * **slot-makunbound** //instance slot-name// → //instance// ====Arguments and Values==== * //instance// -- instance. * //slot-name// - a //[[CL:Glossary:symbol]]//. ====Description==== The //[[CL:Glossary:function]]// **slot-makunbound** restores a //[[CL:Glossary:slot]]// of the name //slot-name// in an //instance// to the unbound state. ====Examples==== None. ====Affected By==== None. ====Exceptional Situations==== If no //[[CL:Glossary:slot]]// of the name //slot-name// exists in the //instance//, **[[CL:Functions:slot-missing]]** is called as follows: <blockquote> (slot-missing (class-of //instance//) //instance// //slot-name// 'slot-makunbound) </blockquote> (Any values returned by **[[CL:Functions:slot-missing]]** in this case are ignored by **slot-makunbound**.) The specific behavior depends on //instance//'s //[[CL:Glossary:metaclass]]//. An error is never signaled if //instance// has //[[CL:Glossary:metaclass]]// **[[CL:Types:standard-class]]**. An error is always signaled if //instance// has //[[CL:Glossary:metaclass]]// **[[CL:Types:built-in-class]]**. The consequences are undefined if //instance// has any other //[[CL:Glossary:metaclass]]//--an error might or might not be signaled in this situation. Note in particular that the behavior for //[[CL:Glossary:conditions]]// and //[[CL:Glossary:structures]]// is not specified. ====See Also==== * **[[CL:Functions:slot-boundp|Function SLOT-BOUNDP]]** * **[[CL:Functions:slot-missing|Generic Function SLOT-MISSING]]** ====Notes==== Although no //[[CL:Glossary:implementation]]// is required to do so, implementors are strongly encouraged to implement the //[[CL:Glossary:function]]// **slot-makunbound** using the //[[CL:Glossary:function]]// **[[CL:Functions:slot-makunbound-using-class]]** described in the //[[CL:Glossary:Metaobject Protocol]]//. \issue{SLOT-MISSING-VALUES:SPECIFY} \issue{SLOT-VALUE-METACLASSES:LESS-MINIMAL}