error: no viable conversion from returned value of type 'int' to function return type 'QString'

[w5688414]

my QT version is 5.9.7,
mac os system
error occurs when I compile:
sml/smlworkbook.cpp:40:12: error: no viable conversion from returned value of type 'int' to function return type 'QString' return bookViews_raw[0][attribute].toInt(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:219:5: note: candidate constructor not viable: no known conversion from 'int' to 'QChar' for 1st argument QString(QChar c); ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:228:12: note: candidate constructor not viable: no known conversion from 'int' to 'QString &&' for 1st argument inline QString(QString && other) Q_DECL_NOTHROW : d(other.d) { other.d ... ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:658:31: note: candidate constructor not viable: no known conversion from 'int' to 'const char *' for 1st argument inline QT_ASCII_CAST_WARN QString(const char *ch) ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:661:31: note: candidate constructor not viable: no known conversion from 'int' to 'const QByteArray &' for 1st argument inline QT_ASCII_CAST_WARN QString(const QByteArray &a) ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:777:12: note: candidate constructor not viable: no known conversion from 'int' to 'const QString::Null &' for 1st argument inline QString(const Null &): d(Data::sharedNull()) {} ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:787:29: note: candidate constructor not viable: no known conversion from 'int' to 'QStringDataPtr' for 1st argument Q_DECL_CONSTEXPR inline QString(QStringDataPtr dd) : d(dd.ptr) {} ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:880:17: note: candidate constructor not viable: no known conversion from 'int' to 'QLatin1String' for 1st argument inline QString::QString(QLatin1String aLatin1) : d(fromLatin1_helper(aLatin1... ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:906:17: note: candidate constructor not viable: no known conversion from 'int' to 'const QString &' for 1st argument inline QString::QString(const QString &other) Q_DECL_NOTHROW : d(other.d) ^ sml/smlworkbook.cpp:40:12: error: no viable conversion from returned value of type 'int' to function return type 'QString' return bookViews_raw[0][attribute].toInt(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:219:5: note: candidate constructor not viable: no known conversion from 'int' to 'QChar' for 1st argument QString(QChar c); ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:228:12: note: candidate constructor not viable: no known conversion from 'int' to 'QString &&' for 1st argument inline QString(QString && other) Q_DECL_NOTHROW : d(other.d) { other.d ... ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:658:31: note: candidate constructor not viable: no known conversion from 'int' to 'const char *' for 1st argument inline QT_ASCII_CAST_WARN QString(const char *ch) ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:661:31: note: candidate constructor not viable: no known conversion from 'int' to 'const QByteArray &' for 1st argument inline QT_ASCII_CAST_WARN QString(const QByteArray &a) ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:777:12: note: candidate constructor not viable: no known conversion from 'int' to 'const QString::Null &' for 1st argument inline QString(const Null &): d(Data::sharedNull()) {} ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:787:29: note: candidate constructor not viable: no known conversion from 'int' to 'QStringDataPtr' for 1st argument Q_DECL_CONSTEXPR inline QString(QStringDataPtr dd) : d(dd.ptr) {} ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:880:17: note: candidate constructor not viable: no known conversion from 'int' to 'QLatin1String' for 1st argument inline QString::QString(QLatin1String aLatin1) : d(fromLatin1_helper(aLatin1... ^ /Users/eric/Qt5.9.7/5.9.7/clang_64/lib/QtCore.framework/Headers/qstring.h:906:17: note: candidate constructor not viable: no known conversion from 'int' to 'const QString &' for 1st argument inline QString::QString(const QString &other) Q_DECL_NOTHROW : d(other.d) ^ 1 error generated. make[3]: *** [.obj/debug/smlworkbook.o] Error 1 make[3]: *** Waiting for unfinished jobs....

[w5688414]

the solutions: #1

[Sadam452]

Replace bookViews_raw[0][attribute].toInt()
with
QString::fromStdString(bookViews_raw[0][attribute].toStdString());