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CWG Issue 220

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

[Voted into the WP at the September, 2008 meeting (resolution in paper N2757).]

[Picked up by evolution group at October 2002 meeting.]

The default global operators delete are specified to not throw, but there is no requirement that replacement global, or class-specific, operators delete must not throw. That ought to be required.

In particular:

• 6.8.6.5.3 [basic.stc.dynamic.deallocation] paragraph 2, at the end of the first sentence, should also require that no exceptions be thrown.
• 11.4.11 [class.free], including its examples, should require nonthrowing class-specific operator delete.
• 16.4.5.6 [replacement.functions] paragraph 2 should append throw() to the signature of each of the four operators delete.

We already require that all versions of an allocator's deallocate() must not throw, so that part is okay.

Rationale (04/00):

1. Replacement deallocation functions are already required not to throw an exception (cf 16.4.5.8 [res.on.functions] paragraph 2, as applied to 17.6.3.2 [new.delete.single] paragraph 12 and 17.6.3.3 [new.delete.array] paragraph 11).
2. Section 16.4.5.6 [replacement.functions] is describing the signatures of the functions to be replaced; exception specfications are not part of the signature.
3. There does not appear to be any pressing need to require that class member deallocation functions not throw.

Note (March, 2008):

The Evolution Working Group has accepted the intent of this issue and referred it to CWG for action for C++0x (see paper J16/07-0033 = WG21 N2173).

Proposed resolution (March, 2008):

Change 6.8.6.5.3 [basic.stc.dynamic.deallocation] paragraph 3 as follows:

A deallocation function shall not terminate by throwing an exception. The value of the first argument supplied to a deallocation function...

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