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QXml: reduce allocations in extractEncodingDecl

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Replace QString::left() with QString::leftRef().
Use QStringLiteral more.

Change-Id: Ibcecc666d034a5e1fe963119483030ab397b16b1
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Anton Kudryavtsev 2016-06-27 16:40:57 +03:00
parent e7d4760314
commit 5392259ce6
1 changed files with 2 additions and 1 deletions
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src/xml/sax/qxml.cpp
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@ -1295,7 +1295,8 @@ static QString extractEncodingDecl(const QString &text, bool *needMoreText)
*needMoreText = false; *needMoreText = false;
int l = text.length(); int l = text.length();
QString snip = QString::fromLatin1("<?xml").left(l); const QString declStart = QStringLiteral("<?xml");
const QStringRef snip = declStart.leftRef(l);
if (l > 0 && !text.startsWith(snip)) if (l > 0 && !text.startsWith(snip))
return QString(); return QString();