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Document number: N4178

Date: 2014-10-07

Proposed resolution for Core Issue 330: Qualification conversions and pointers to arrays of pointers

by Jens Maurer

Excerpt:

This paper presents the proposed resolution for core issue 330 as reviewed in teleconferences of WG21's Core Working Group, substantially cleaning up the wording around qualification converions. Other than allowing the qualification conversions asked for in the issue, it also changes reinterpret_cast so that it may now cast away constness. For example,

reinterpret_cast<int *>((const void *)0)

is ill-formed in C++14 due to the provision in 5.2.10 [expr.reinterpret.cast] paragraph 2 "The reinterpret_cast operator shall not cast away constness (5.2.11 expr.const.cast)". The wording changes below will remove this restriction, thus the example above will become well-formed. Given the general nature of reinterpret_cast, the restriction on casting away constness appeared as a rather odd constraint.