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import from UXP: [MFBT] Reduce size() calls in subspan. (8bc63bff)

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roytam1
2026-02-27 07:16:51 +08:00
parent a4a6cf4373
commit 917f8d5eff
1 changed files with 8 additions and 7 deletions
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mfbt/Span.h
+8 -7
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@@ -649,10 +649,11 @@ public:
template<size_t Offset, size_t Count = dynamic_extent>
MOZ_SPAN_GCC_CONSTEXPR Span<element_type, Count> Subspan() const
{
MOZ_RELEASE_ASSERT(Offset <= size() &&
(Count == dynamic_extent || (Offset + Count <= size())));
const size_t len = size();
MOZ_RELEASE_ASSERT(Offset <= len &&
(Count == dynamic_extent || (Count <= len - Offset)));
return { data() + Offset,
Count == dynamic_extent ? size() - Offset : Count };
Count == dynamic_extent ? len - Offset : Count };
}
/**
@@ -682,11 +683,11 @@ public:
index_type aStart,
index_type aLength = dynamic_extent) const
{
MOZ_RELEASE_ASSERT(aStart <= size() &&
(aLength == dynamic_extent ||
(aStart + aLength <= size())));
const size_t len = size();
MOZ_RELEASE_ASSERT(aStart <= len &&
(aLength == dynamic_extent || (aLength <= len - aStart)));
return { data() + aStart,
aLength == dynamic_extent ? size() - aStart : aLength };
aLength == dynamic_extent ? len - aStart : aLength };
}
/**