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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [C++17] std::map::insert_or_assign w/ hint violate complexity requirements"
href="https://bugs.llvm.org/show_bug.cgi?id=38722">38722</a>
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<th>Summary</th>
<td>[C++17] std::map::insert_or_assign w/ hint violate complexity requirements
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>7.0
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kariya_mitsuru@hotmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<pre>The current implementations of std::map::insert_or_assign w/ hint
(const_iterator argument) ignore hint.
I think that they violate complexity requirements.
The C++17 standard [map.modifiers] p.14 and p.18 says,
Complexity: The same as emplace and emplace_hint, respectively.
and, Complexity column of emplace_hint in [associative.reqmts] table 90 says,
logarithmic in general, but amortized constant if the element is inserted right
before p
cf. <a href="https://wandbox.org/permlink/SvAYpldPEpx711TD">https://wandbox.org/permlink/SvAYpldPEpx711TD</a></pre>
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