Implement LWG-4293: span::subspan/first/last chooses wrong constructor when T is const-qualified bool - #6437
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zika (tycket033-tech) wants to merge 2 commits into
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… when T is const-qualified bool
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🟢 Approval recommended
The implementation consistently applies LWG-4293 across every affected overload with matching test coverage.
Pull request overview
Aligns std::span subview construction with LWG-4293.
Changes:
- Direct-initializes spans returned by
first,last, andsubspan. - Adds constexpr/runtime coverage for
span<const bool>subviews.
File summaries
| File | Description |
|---|---|
stl/inc/span |
Updates all subview return constructions. |
tests/std/tests/P0122R7_span/test.cpp |
Tests const-qualified Boolean subviews. |
Review details
- Files reviewed: 2/2 changed files
- Comments generated: 0
- Review effort level: Balanced
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Fixes #6239
LWG-4293 changes the Effects of
span::first/last/subspantodirect-initialize the returned span (
(ptr, count)) instead of brace-initializing,so an
initializer_listconstructor can never hijack these calls.Since P2447R6 was reverted and MSVC STL never implemented it anyway, this has
zero functional impact — just a wording-sync per "Do What The Standard Says".