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2743. p0083r3node_handle private members missing "exposition only" comment
Section: 23.2.5.1 [container.node.overview] Status: C++23 Submitter: Richard Smith Opened: 2016-07-08 Last modified: 2023-11-22
Priority: 3
View all other issues in [container.node.overview].
View all issues with C++23 status.
Discussion:
The private members of node_handle are missing the usual "exposition only" comment. As a consequence, ptr_ and alloc_ now appear to be names defined by the library (so programs defining these names as macros before including a library header have undefined behavior).
node_handle is reserved for library usage or not; 23.2.5.1 [container.node.overview]/3 says the implementation need not provide a type with this name, but doesn't seem to rule out the possibility that an implementation will choose to do so regardless.
Daniel:
A similar problem seems to exist for the exposition-only typecall_wrapper from p0358r1, which exposes a private data member named fd and a typedef FD.
[2016-07 Chicago]
Jonathan says that we need to make clear that the name node_handle is not reserved
[2019-03-17; Daniel comments and provides wording]
Due to an editorial step, the previous name node_handle/node_handle has been replaced by the artificial node-handle name, so I see no longer any reason to talk about a name node_handle reservation. The provided wording therefore only takes care of the private members.
[2020-05-16 Reflector discussions]
Status to Tentatively Ready after five positive votes on the reflector.
[2020-11-09 Approved In November virtual meeting. Status changed: Tentatively Ready → WP.]
Proposed resolution:
This wording is relative to N4810.
Change 23.2.5.1 [container.node.overview], exposition-only class template node-handle synopsis, as indicated:
template<unspecified>
class node-handle {
public:
[…]
private:
using container_node_type = unspecified; // exposition only
using ator_traits = allocator_traits<allocator_type>; // exposition only
typename ator_traits::template rebind_traits<container_node_type>::pointer ptr_; // exposition only
optional<allocator_type> alloc_; // exposition only
public:
[…]
};
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