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<code>&lt;regex&gt;</code>: Extend some optimizations for simple loops to branchless but reentrant and branching but non-reentrant loops

Status: Open.

#5957 In microsoft/STL;

· muellerj2 opened on Dec 11, 2025

<code>STL.natvis</code>: Need visualizers for <code>flat_multimap</code> and <code>flat_multiset</code>

flat_meowC++23 container adaptorsC++23 container adaptors

visualizerHow the VS debugger displays STL typesHow the VS debugger displays STL types

Status: Open.

#5950 In microsoft/STL;

· StephanTLavavej opened on Dec 9, 2025

<code>&lt;regex&gt;</code>: Revising the stack and complexity limits

enhancementSomething can be improvedSomething can be improved

regexmeow is a substring of homeownermeow is a substring of homeowner

Status: Open.

#5944 In microsoft/STL;

· muellerj2 opened on Dec 6, 2025

<code>&lt;complex&gt;</code>: Structured binding for <code>complex</code> is accidentally enabled before C++26, in a C++26-incompatible way

enhancementSomething can be improvedSomething can be improved

Status: Open.

#5913 In microsoft/STL;

· frederick-vs-ja opened on Nov 26, 2025

Vectorize <code>replace_copy</code> for x64 / x86

performanceMust go fasterMust go faster

Status: Open.

#5908 In microsoft/STL;

· AlexGuteniev opened on Nov 24, 2025

Possible missed optimization for non-common bidirectional ranges in <code>&lt;algorithm&gt;</code>

performanceMust go fasterMust go faster

rangesC++20/23 rangesC++20/23 ranges

Status: Open.

#5903 In microsoft/STL;

· vmichal opened on Nov 23, 2025

<code>&lt;xpolymorphic_allocator&gt;</code>: polymorphic_allocator::construct should not require is_constructible_v

Status: Open.

#5901 In microsoft/STL;

· AnyOldName3 opened on Nov 22, 2025

<code>&lt;print&gt;</code>: <code>std::println("{}", ...)</code> UTF-8 Truncation Bug with <code>/utf-8</code> (256-byte Buffer Split)

bugSomething isn't workingSomething isn't working

formatC++20/23 formatC++20/23 format

Status: Open.

#5894 In microsoft/STL;

· 739C1AE2 opened on Nov 21, 2025

LWG-4015 LWG-3973 broke <code>const</code> overloads of <code>std::optional</code> monadic operations

LWGLibrary Working Group issueLibrary Working Group issue

Status: Open.

#5871 In microsoft/STL;

· StephanTLavavej opened on Nov 14, 2025

LWG-3627 Inconsistent specifications for <code>std::make_optional</code> overloads

documentationRelated to documentation or commentsRelated to documentation or comments

LWGLibrary Working Group issueLibrary Working Group issue

Status: Open.

#5851 In microsoft/STL;

· StephanTLavavej opened on Nov 13, 2025

LWG-3090 What is [time.duration.cons]/4's "no overflow is induced in the conversion" intended to mean?

chronoC++20 chronoC++20 chrono

LWGLibrary Working Group issueLibrary Working Group issue

Status: Open.

#5850 In microsoft/STL;

· StephanTLavavej opened on Nov 13, 2025

P3923R0 Additional NB Comment Resolutions For Kona 2025

cxx26C++26 featureC++26 feature

Status: Open.

#5844 In microsoft/STL;

· StephanTLavavej opened on Nov 10, 2025