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Fix test for platforms where "weak-alignment" allocations are implemented, small allocations can't return alignment smaller than "max_align".

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Ion Gaztañaga
2025-12-23 22:37:16 +01:00
parent 0d2dff8517
commit 8ac7364a16
1 changed files with 9 additions and 1 deletions
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10
test/new_delete_resource_test.cpp
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@@ -67,7 +67,15 @@ void test_allocate_various_sizes()
const std::size_t sz = sizes[i];
void* p = mr->allocate(sz);
BOOST_TEST(p != 0);
BOOST_TEST(is_aligned(p, max_align));
//See:
// WG14 N2293: Alignment requirements for memory management functions
//
//The alignment requirements of malloc, calloc, and realloc are ambiguously phrased for small
//allocations. The "strong-alignment" reading demands _Alignof(max_align_t) alignment regardless
//of size, while the "weak-alignment" reading requires only enough alignment to accommodate
//types that could fit in the allocated memory—meaning small allocations need only align to the largest
//power of two not exceeding the requested size. Many implementations use weak alignment
BOOST_TEST(is_aligned(p, sz < max_align ? sz : max_align));
// Write to allocated memory
std::memset(p, 0xCD, sz);