This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
2107. Lifetime of temporaries for default arguments in array copyingSection: 6.8.7 [class.temporary] Status: CD4 Submitter: Hubert Tong Date: 2015-03-19[Adopted at the February, 2016 meeting.]
The lifetime of temporaries introduced for default arguments in array copying is not specified clearly. Presumably it should be treated like default arguments in default constructors (6.8.7 [class.temporary] paragraph 4), which deletes each element's set of default argument temporaries before construction of the next element.
Proposed resolution (September, 2015):
Change 6.8.7 [class.temporary] paragraphs 4-5 as follows:
There are two three contexts in which temporaries are destroyed at a different point than the end of the full-expression. The first context is when a default constructor is called to initialize an element of an array with no corresponding initializer (9.5 [dcl.init]). The second context is when a copy constructor is called to copy an element of an array while the entire array is copied (7.5.6 [expr.prim.lambda], 11.4.5.3 [class.copy.ctor]). If In either case, if the constructor has one or more default arguments, the destruction of every temporary created in a default argument is sequenced before the construction of the next array element, if any.
The second third context is when a reference is bound to a temporary.117 The temporary to which the reference is bound...
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