Implement P3567R2 flat_meow Fixes
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With additional condition fixes for `append_range`
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frederick-vs-ja
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Nov 19, 2025
…ome constexpr restrictions".
tests/std/tests/P0429R9_flat_map_ms_specific/test.compile.pass.cpp
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StephanTLavavej
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Dec 1, 2025
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Towards #2910 and #2912.
Implements Part
swapShould be Conditionallynoexceptinsert_range(sorted_unique, rg), andfrom WG21-P3567R2. Other parts are probably already implemented.
Drive-by changes:
[[msvc::no_unique_address]]toflat_meowin the feature.append_range- we may only rely it when it belongs to some standard containers.Blocked libcxx tests:
std/containers/container.adaptors/flat.map/flat.map.modifiers/swap_free.pass.cpp(testing old, overly strong exception specification)std/containers/container.adaptors/flat.map/flat.map.modifiers/swap_member.pass.cpp(same as above)std/containers/container.adaptors/flat.multimap/flat.multimap.modifiers/swap_free.pass.cpp(same as above)std/containers/container.adaptors/flat.multimap/flat.multimap.modifiers/swap_member.pass.cpp(same as above)std/containers/container.adaptors/flat.multiset/flat.multiset.modifiers/swap_free.pass.cpp(same as above)std/containers/container.adaptors/flat.multiset/flat.multiset.modifiers/swap_member.pass.cpp(same as above)std/containers/container.adaptors/flat.set/flat.set.modifiers/swap_free.pass.cpp(same as above)std/containers/container.adaptors/flat.set/flat.set.modifiers/swap_member.pass.cpp(same as above)std/language.support/support.limits/support.limits.general/flat_map.version.compile.pass.cpp(testing old FTM value)std/language.support/support.limits/support.limits.general/flat_set.version.compile.pass.cpp(same as above)Unblocked libcxx test:
std/containers/container.adaptors/flat.multiset/flat.multiset.modifiers/insert_range.pass.cpp(due to the drive-by fix)std/containers/container.adaptors/flat.set/flat.set.modifiers/insert_range.pass.cpp(same as above; but only for Clang, because MSVC hasn't implemented WG21-P2448R2)