2014-02-10 47 views
0

此代碼編譯沒有任何問題Qt5.2.0 MSVC2012:用gcc編譯,如果使用lambda功能的QObject ::連接失敗()

#include <QCoreApplication> 
#include <QObject> 
#include <QTimer> 
#include <QDebug> 

int main(int argc, char *argv[]) 
{ 
    QTimer timer; 
    QCoreApplication a(argc, argv); 

    QObject::connect(&timer, &QTimer::timeout, 
      [=]() { 
     qDebug() << Q_FUNC_INFO; 
    }); 

    timer.start(1000); 

    return a.exec(); 
} 

但如果我嘗試用gcc與Qt5.2.0編譯它,我得到這個錯誤:

../_test_gccLambda/main.cpp: In function 'int main(int, char**)': ../_test_gccLambda/main.cpp:14:5: warning: lambda expressions only available with -std=c++11 or -std=gnu++11 [enabled by default] }); ^ ../_test_gccLambda/main.cpp:14:6: error: no matching function for call to 'QObject::connect(QTimer*, void (QTimer::)(QTimer::QPrivateSignal), main(int, char*)::__lambda0)' }); ^ ../_test_gccLambda/main.cpp:14:6: note: candidates are: In file included from ../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0, from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1, from ../_test_gccLambda/main.cpp:1: ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:198:36: note: static QMetaObject::Connection QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType) static QMetaObject::Connection connect(const QObject *sender, const char *signal, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:198:36: note: candidate expects 5 arguments, 3 provided ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:201:36: note: static QMetaObject::Connection QObject::connect(const QObject*, const QMetaMethod&, const QObject*, const QMetaMethod&, Qt::ConnectionType) static QMetaObject::Connection connect(const QObject *sender, const QMetaMethod &signal, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:201:36: note: candidate expects 5 arguments, 3 provided ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:479:32: note: QMetaObject::Connection QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const inline QMetaObject::Connection QObject::connect(const QObject *asender, const char *asignal, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:479:32: note: no known conversion for argument 2 from 'void (QTimer::)(QTimer::QPrivateSignal)' to 'const char' ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:215:43: note: template static QMetaObject::Connection QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, const typename QtPrivate::FunctionPointer::Object*, Func2, Qt::ConnectionType) static inline QMetaObject::Connection connect(const typename QtPrivate::FunctionPointer::Object *sender, Func1 signal, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:215:43: note: template argument deduction/substitution failed: ../_test_gccLambda/main.cpp:14:6: note: mismatched types 'const typename QtPrivate::FunctionPointer::Object*' and 'main(int, char**)::__lambda0' }); ^ In file included from ../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0, from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1, from ../_test_gccLambda/main.cpp:1: ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:247:13: note: template static typename QtPrivate::QEnableIf<((int)(QtPrivate::FunctionPointer::ArgumentCount) >= 0), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2) connect(const typename QtPrivate::FunctionPointer::Object *sender, Func1 signal, Func2 slot) ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:247:13: note: template argument deduction/substitution failed: ../_test_gccLambda/main.cpp: In substitution of 'template static typename QtPrivate::QEnableIf<((int)(QtPrivate::FunctionPointer::ArgumentCount) >= 0), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2) [with Func1 = void (QTimer::)(QTimer::QPrivateSignal); Func2 = main(int, char*)::__lambda0]': ../_test_gccLambda/main.cpp:14:6: required from here ../_test_gccLambda/main.cpp:14:6: error: template argument for 'template static typename QtPrivate::QEnableIf<((int)(QtPrivate::FunctionPointer::ArgumentCount) >= 0), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2)' uses local type 'main(int, char**)::__lambda0' }); ^ ../_test_gccLambda/main.cpp:14:6: error: trying to instantiate 'template static typename QtPrivate::QEnableIf<((int)(QtPrivate::FunctionPointer::ArgumentCount) >= 0), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2)' In file included from ../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0, from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1, from ../_test_gccLambda/main.cpp:1: ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:256:13: note: template static typename QtPrivate::QEnableIf<(((int)(QtPrivate::FunctionPointer::ArgumentCount) >= 0) && (! QtPrivate::FunctionPointer::IsPointerToMemberFunction)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, const QObject*, Func2, Qt::ConnectionType) connect(const typename QtPrivate::FunctionPointer::Object *sender, Func1 signal, const QObject *context, Func2 slot, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:256:13: note: template argument deduction/substitution failed: ../_test_gccLambda/main.cpp:14:6: note: cannot convert 'main(int, char**)::__lambda0{}' (type 'main(int, char**)::__lambda0') to type 'const QObject*' }); ^ In file included from ../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0, from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1, from ../_test_gccLambda/main.cpp:1: ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:287:13: note: template static typename QtPrivate::QEnableIf<(QtPrivate::FunctionPointer::ArgumentCount == (-1)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2) connect(const typename QtPrivate::FunctionPointer::Object *sender, Func1 signal, Func2 slot) ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:287:13: note: template argument deduction/substitution failed: ../_test_gccLambda/main.cpp: In substitution of 'template static typename QtPrivate::QEnableIf<(QtPrivate::FunctionPointer::ArgumentCount == (-1)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2) [with Func1 = void (QTimer::)(QTimer::QPrivateSignal); Func2 = main(int, char*)::__lambda0]': ../_test_gccLambda/main.cpp:14:6: required from here ../_test_gccLambda/main.cpp:14:6: error: template argument for 'template static typename QtPrivate::QEnableIf<(QtPrivate::FunctionPointer::ArgumentCount == (-1)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2)' uses local type 'main(int, char**)::__lambda0' }); ^ ../_test_gccLambda/main.cpp:14:6: error: trying to instantiate 'template static typename QtPrivate::QEnableIf<(QtPrivate::FunctionPointer::ArgumentCount == (-1)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, Func2)' In file included from ../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0, from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1, from ../_test_gccLambda/main.cpp:1: ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:295:13: note: template static typename QtPrivate::QEnableIf<(QtPrivate::FunctionPointer::ArgumentCount == (-1)), QMetaObject::Connection>::Type QObject::connect(const typename QtPrivate::FunctionPointer::Object*, Func1, const QObject*, Func2, Qt::ConnectionType) connect(const typename QtPrivate::FunctionPointer::Object *sender, Func1 signal, const QObject *context, Func2 slot, ^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:295:13: note: template argument deduction/substitution failed: ../_test_gccLambda/main.cpp:14:6: note: cannot convert 'main(int, char**)::__lambda0{}' (type 'main(int, char**)::__lambda0') to type 'const QObject*' }); ^ make: * [main.o] Error 1 16:53:24: The process "/usr/bin/make" exited with code 2. Error while building/deploying project _test_gccLambda (kit: Desktop Qt 5.2.0 GCC 64bit) When executing step 'Make' 16:53:24: Elapsed time: 00:02.

問題在哪裏?

+1

使用-std = C++ 11模式編譯。見http://stackoverflow.com/questions/17299139/building-qt-project-for-c11-standard – Khurshid

+3

'CONFIG + = C++ 11',如果你使用QMake –

+0

它的工作原理。謝謝! – avb

回答

0

如在註釋中回答,請使用-std = C++ 11來使用gcc編譯

+0

我不確定一個表明缺乏基本的閱讀理解能力或語言意識的問題需要一個答案。但是,當您發佈其他人的評論作爲答案時,您至少可以解釋所需的所有內容(即在某些情況下包括QMake配置)以及爲什麼。 –

+0

我非常認真地嘗試遵循meta stack溢出中提出的程序;當迴應是在評論(給答案和把社區維基)。我同意你的意見,事實上我寧願能夠報告這個問題太蹩腳,但似乎沒有這樣的標誌。 – sandwood