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Showing content from https://cplusplus.github.io/LWG/issue3457 below:

Issue 3457: *this is not invalidated

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of New status.

Section: 27.3.3 [string.view.template] Status: New Submitter: Johel Ernesto Guerrero Peña Opened: 2020-06-26 Last modified: 2020-09-06

Priority: 3

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Discussion:

27.3.3 [string.view.template] states:

For a basic_string_view str, any operation that invalidates a pointer in the range [str.data(), str.data() + str.size()) invalidates pointers, iterators, and references returned from str's member functions.

The assignment operators return a reference to *this, but *this is not invalidated.

Previous resolution [SUPERSEDED]:

This wording is relative to N4861.

1. Modify 27.3.3 [string.view.template] as indicated:

   -2- For a basic_string_view str, any operation that invalidates a pointer in the range [str.data(), str.data() + str.size()) invalidates pointers, iterators, and references to the elements in that range and its past-the-end iterator returned from str's member functions.

[2020-06-29; Casey comments and provides alternative proposed wording]

I think we should additionally strike "returned from str's member functions" from the end of the sentence. Provenance shouldn't affect invalidation; ranges::next(some_string_view.begin(), 42), for example, returns an iterator that denotes an element of some_string_view, but is not a member function of basic_string_view.

[2020-07-05; Reflector prioritization]

Set priority to 3 after reflector discussions.

Proposed resolution:

This wording is relative to N4861.

1. Modify 27.3.3 [string.view.template] as indicated:

   -2- For a basic_string_view str, any operation that invalidates a pointer in the range [str.data(), str.data() + str.size()) invalidates pointers, iterators, and references to the elements in that range and its past-the-end iterator returned from str's member functions.

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