Lambda function as slot

Added by Freddy Martinez Garcia over 8 years ago

Hi guys...

why compiler give error with this code ?

    WPushButton* cancelButton = new WPushButton("Cancel");
    cancelButton->clicked().connect([=](){
        // limpiando los edit y poniendo el focus en el login
        this->m_loginEdit->setText(u8"");
        this->m_passwordEdit->setText(u8"");

        this->m_loginEdit->setFocus(true);
    });

the error is:

../TestStore/LoginForm.cpp:19:47: note: candidate is:
../TestStore/LoginForm.cpp:19:49: note: LoginForm::init()::<lambda()>
../TestStore/LoginForm.cpp:19:49: note:   candidate expects 0 arguments, 1 provided

can I use lambda c++11 as slot just like Qt ??? I'm a Qt developer, not Wt developer...

regards

Replies (3)

RE: Lambda function as slot - Added by Trigve Siver over 8 years ago

I think that lambda should have 1 parameter. You have none.

RE: Lambda function as slot - Added by Steven Descheemaeker over 8 years ago

you need std::bind like :

cancelButton->clicked().connect(std::bind([=](){

// limpiando los edit y poniendo el focus en el login

this~~m_loginEdit>setText(u8"");

thism_passwordEdit~~>setText(u8"");

this~~m_loginEdit~~>setFocus(true);

}));

RE: Lambda function as slot - Added by Wim Dumon over 8 years ago

The std::bind() is indeed a convenient method to 'throw away' parameters that you don't care about.

Wim.

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