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Tests: sweep_allocator::construct() accepts pointers to const

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Recent libc++ (emsdk latest) probes construct(const T*, const T&) in an
unevaluated context while checking for trivial copies; the static_cast to
void* in the noexcept specification then fails to compile.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N5NasEsrzHhSNouxSoEwqz
(cherry picked from commit 794bf70823c12a2a1cb2a8a95f34dfb6357746a8)
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-11-07 08:33:17 +00:00
1 parent 055e90087f
commit 5e49bac94f
1 file changed
+4 -2
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tests/src/unit-allocator.cpp
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@@ -1073,10 +1073,12 @@ struct sweep_allocator
return (std::numeric_limits<std::size_t>::max)() / sizeof(T);
}
// p may point to a const object when libc++ probes whether construct() is
// usable for copying, which static_cast<void*>(p) would not accept
template<class U, class... Args>
void construct(U* p, Args&& ... args) noexcept(noexcept(::new (static_cast<void*>(p)) U(std::forward<Args>(args)...)))
void construct(U* p, Args&& ... args) noexcept(noexcept(::new (const_cast<void*>(static_cast<const volatile void*>(p))) U(std::forward<Args>(args)...)))
{
::new (static_cast<void*>(p)) U(std::forward<Args>(args)...);
::new (const_cast<void*>(static_cast<const volatile void*>(p))) U(std::forward<Args>(args)...);
}
template<class U>