View source for cpp/language/destructor

===Deleted destructor===
The implicitly-declared or explicitly-defaulted destructor for class {{tt|T}} is {{rev inl|until=c++11| undefined}}{{rev inl|since=c++11|defined as deleted}} if any of the following conditions is satisfied:
* {{tt|T}} has a {{rlp|object#Subobjects|potentially constructed subobject}} of class type {{tt|M}} (or possibly multi-dimensional array thereof) such that {{tt|M}} has a destructor that
:* is deleted or inaccessible from the destructor of {{tt|T}}, or
:* in the case of the subobject being a {{rlp|union#Union-like classes|variant member}}, is non-trivial.
* The destructor is virtual and the lookup for the [[cpp/memory/new/operator delete|deallocation function]] results in
:* an ambiguity, or
:* a function that is deleted or inaccessible from the destructor.

{{rrev|since=c++20|
An explicitly-defaulted prospective destructor for {{tt|T}} is defined as deleted if it is not the destructor for {{tt|T}}.
}}