[clazy] [Bug 361691] Suggestion to turn string into QStringLiteral instead of QLatin1String

[Stephen Kelly via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361691

--- Comment #3 from Stephen Kelly <steve...@gmail.com> ---
I tried to replicate your result unsuccessfully. Do you still have your
benchmark? I tried Qt 5.4.2 and some recent git branch.

#include <QtTest/QTest>

class StringBenchmark : public QObject
{
  Q_OBJECT
public:
  StringBenchmark(QObject* parent = nullptr) : QObject(parent)
  {
    for (auto i = 0; i < 10000; ++i)
    {
      mTestString += QStringLiteral("Long string part %1 --").arg(i);
    }
  }

private slots:
  void containsQStringLiteral() {
    QBENCHMARK {
      auto result = mTestString.contains(QStringLiteral("Long string part
5555"));
      QVERIFY(result);
    }
  }

  void containsQLatin1String() {
    QBENCHMARK {
      auto result = mTestString.contains(QLatin1String("Long string part
5555"));
      QVERIFY(result);
    }
  }

  void indexOfQStringLiteral() {
    QBENCHMARK {
      auto result = mTestString.indexOf(QStringLiteral("Long string part
5555"));
      QCOMPARE(result, 132210);
    }
  }

  void indexOfQLatin1String() {
    QBENCHMARK {
      auto result = mTestString.indexOf(QLatin1String("Long string part
5555"));
      QCOMPARE(result, 132210);
    }
  }

private:
  QString mTestString;
};

QTEST_MAIN(StringBenchmark)

#include "tester.moc"

********* Start testing of StringBenchmark *********
Config: Using QtTest library 5.8.0, Qt 5.8.0 (x86_64-little_endian-lp64 shared
(dynamic) release build; by GCC 5.2.1 20151010)
PASS   : StringBenchmark::initTestCase()
PASS   : StringBenchmark::containsQStringLiteral()
RESULT : StringBenchmark::containsQStringLiteral():
     0.038 msecs per iteration (total: 79, iterations: 2048)
PASS   : StringBenchmark::containsQLatin1String()
RESULT : StringBenchmark::containsQLatin1String():
     0.040 msecs per iteration (total: 82, iterations: 2048)
PASS   : StringBenchmark::indexOfQStringLiteral()
RESULT : StringBenchmark::indexOfQStringLiteral():
     0.038 msecs per iteration (total: 78, iterations: 2048)
PASS   : StringBenchmark::indexOfQLatin1String()
RESULT : StringBenchmark::indexOfQLatin1String():
     0.038 msecs per iteration (total: 78, iterations: 2048)
PASS   : StringBenchmark::cleanupTestCase()
Totals: 6 passed, 0 failed, 0 skipped, 0 blacklisted, 1301ms
********* Finished testing of StringBenchmark *********

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