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| <title>Issue 4011: "Effects: Equivalent to return" in [span.elem]</title> | ||
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| <p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p> | ||
| <h3><a name="4011" href="lwg-active.html#4011">4011</a>. "<i>Effects</i>: Equivalent to return" in [span.elem]</h3> | ||
| <p><b>Section:</b> 24.7.2.2.6 <a href="https://wg21.link/span.elem">[span.elem]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a> | ||
| <b>Submitter:</b> Arthur O'Dwyer <b>Opened:</b> 2023-11-09 <b>Last modified:</b> 2023-11-18</p> | ||
| <p><b>Priority: </b>Not Prioritized | ||
| </p> | ||
| <p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p> | ||
| <p><b>Discussion:</b></p> | ||
| <p> | ||
| In reviewing the wording for <a href="https://wg21.link/P2821">P2821</a> <tt>span.at()</tt>, it had been noticed that | ||
| 24.7.2.2.6 <a href="https://wg21.link/span.elem">[span.elem]</a> uses a lot of "<i>Effects</i>: Equivalent to return […];" which | ||
| could be simply "<i>Returns</i>: […]". | ||
| <p/> | ||
| For comparison, 23.3.3.6 <a href="https://wg21.link/string.view.access">[string.view.access]</a> uses "<i>Returns</i>: ..." instead, so I | ||
| suggest that 24.7.2.2.6 <a href="https://wg21.link/span.elem">[span.elem]</a> should be consistent with that. | ||
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| <p id="res-4011"><b>Proposed resolution:</b></p> | ||
| <p> | ||
| This wording is relative to <a href="https://wg21.link/N4964">N4964</a>. | ||
| </p> | ||
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| <li><p>Modify 24.7.2.2.6 <a href="https://wg21.link/span.elem">[span.elem]</a> as indicated:</p> | ||
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| <pre> | ||
| constexpr reference operator[](size_type idx) const; | ||
| </pre> | ||
| <blockquote> | ||
| <p> | ||
| -1- <i>Preconditions</i>: <tt>idx < size()</tt> is <tt>true</tt>. | ||
| <p/> | ||
| -2- <i><del>Effects</del><ins>Returns</ins></i>: <del>Equivalent to:</del> <tt><del>return</del> *(data() + idx)<del>;</del></tt><ins>.</ins> | ||
| <p/> | ||
| <ins>-?- <i>Throws</i>: Nothing.</ins> | ||
| </p> | ||
| </blockquote> | ||
| <pre> | ||
| constexpr reference front() const; | ||
| </pre> | ||
| <blockquote> | ||
| <p> | ||
| -3- <i>Preconditions</i>: <tt>empty()</tt> is <tt>false</tt>. | ||
| <p/> | ||
| -4- <i><del>Effects</del><ins>Returns</ins></i>: <del>Equivalent to:</del> <tt><del>return</del> *data()<del>;</del></tt><ins>.</ins> | ||
| <p/> | ||
| <ins>-?- <i>Throws</i>: Nothing.</ins> | ||
| </p> | ||
| </blockquote> | ||
| <pre> | ||
| constexpr reference back() const; | ||
| </pre> | ||
| <blockquote> | ||
| <p> | ||
| -5- <i>Preconditions</i>: <tt>empty()</tt> is <tt>false</tt>. | ||
| <p/> | ||
| -6- <i><del>Effects</del><ins>Returns</ins></i>: <del>Equivalent to:</del> <tt><del>return</del> *(data() + (size() - 1))<del>;</del></tt><ins>.</ins> | ||
| <p/> | ||
| <ins>-?- <i>Throws</i>: Nothing.</ins> | ||
| </p> | ||
| </blockquote> | ||
| <pre> | ||
| constexpr pointer data() const noexcept; | ||
| </pre> | ||
| <blockquote> | ||
| <p> | ||
| -7- <i><del>Effects</del><ins>Returns</ins></i>: <del>Equivalent to:</del> <tt><del>return</del> <i>data_</i><del>;</del></tt><ins>.</ins> | ||
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