gcc: Compiling Qt code with lambda function

Asked Jun 18 '16 at 13:33

Active Jun 18 '16 at 13:33

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I have got this piece of code with a lambda function:

QMenu menu(this);
menu.addAction("Set file", this, [this, i](){this->setFile(i);});

where setFile(int i) is a void method defined in the MyMainWindow class.

It works when compiling with MSVC2015, but not with gcc 4:4.9.2-2, which gives this error:

error: no matching function for call to 'QMenu::addAction(const char [6], MyMainWindow*, MyMainWindow::eventFilter(QObject*, QEvent*)::)' menu.addAction("Set file", this, this, i{this->setFile(i);});

My qmake file contains:

CONFIG += c++11

and I have also tried adding:

QMAKE_CXXFLAGS += -std=c++11

But that did not solve the issue. How can I compile this code?

asked Jun 18 '16 at 13:33

mimo

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[See this](http://stackoverflow.com/questions/28746744/passing-lambda-as-function-pointer). You cannot cast a capturing lambda to a function pointer – Rakete1111 Jun 18 '16 at 13:34
@Rakete1111 `QMenu::addAction` doesn't accept a function pointer. – n. m. could be an AI Jun 18 '16 at 20:56
@n.m. [It does, sort of](http://doc.qt.io/qt-5/qmenu.html#addAction-4) – Rakete1111 Jun 18 '16 at 21:02
Make sure you are using the same Qt version. – n. m. could be an AI Jun 18 '16 at 21:02
@Rakete1111 It is a template (the documentation is misleading). – n. m. could be an AI Jun 18 '16 at 23:51

gcc: Compiling Qt code with lambda function

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