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QVarLengthArray: simplify default ctor

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Instead of calling the QVLA(qsizetype) ctor and letting the optimizer
and inliner have a field day on them, simply set the trivial values
for a, s, and ptr manually.

Mark it as noexcept.

Task-number: QTBUG-84785
Change-Id: I011826eacdaf63a4c37b21465e5fe4a6e70a1ab7
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This commit is contained in:
Marc Mutz 2021-11-30 15:45:50 +01:00
parent c891382900
commit 1a61b85a2c
1 changed files with 4 additions and 1 deletions
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5
src/corelib/tools/qvarlengtharray.h
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@ -63,7 +63,10 @@ class QVarLengthArray
static_assert(std::is_nothrow_destructible_v<T>, "Types with throwing destructors are not supported in Qt containers."); static_assert(std::is_nothrow_destructible_v<T>, "Types with throwing destructors are not supported in Qt containers.");
public: public:
QVarLengthArray() : QVarLengthArray(0) {} QVarLengthArray() noexcept
: a{Prealloc}, s{0}, ptr{reinterpret_cast<T *>(array)}
{
}
inline explicit QVarLengthArray(qsizetype size); inline explicit QVarLengthArray(qsizetype size);