Arrays of functions help

[A Former User]

Hi! Or use a lambda:

void MainWindow::sayHi()
{
    qDebug() << "Hi!";
}

void MainWindow::on_pushButton_clicked()
{
    auto const count{10};
    std::array<std::function<void()>,count> myArray;
    for (auto &i : myArray) {
        i = [=]() { this->sayHi(); };
    }
}

[bwcal1999]

@VRonin said in Arrays of functions help:

CONFIG += c++11

I am using QTCreator 5.5.1 and still get the same error. not a member of std with both function and bind.

Also with g++ it i get the same error.

[VRonin]

In Qt Creator click on build->run qmake after you put CONFIG += c++11 in your .pro file

[bwcal1999]

@VRonin yes I have done that several times.

[VRonin]

let's go C++11 mental!

try this code in your main.cpp commenting out all the rest that's already there and tell me if it works and if not what does it complain about

#include <functional>
#include <array>
#include <QDebug>
class MyClass{
public:
    void on_pushButton_clicked()
    {
    std::array<std::function<void()>,10> functions;
    std::fill(std::begin(functions),std::end(functions),std::bind( &MyClass::readMe,this));
    for(const auto& i : functions)
        i();
    }
    void readMe()
    {
        qDebug() << "I got read";
    }

};
int main()
{
MyClass tempClass;
tempClass.on_pushButton_clicked();
return 0;
}

[VRonin]

This is the C++98 version of the code above

#include <QDebug>

class MyClass{
public:

    void on_pushButton_clicked()
    {

    void (MyClass::*functions[10])() ;
    for(int i = 0; i < 10; ++i)
        functions[i] = &MyClass::readMe;
    for(int i = 0; i < 10; ++i)
        (this->*functions[i])();
    }
    void readMe()
    {

        qDebug() <<  "I got read";
    }

};

int main(int argc, char **argv)
{
MyClass tempClass;
tempClass.on_pushButton_clicked();
return 0;
}

[A Former User]

@VRonin This is so retro, i want to watch Miami Vice on VHS now :-D

[SGaist]

@Wieland Starwars on Super 8mm ;)

@bwcal1999 What Qt version, compiler (including version), OS are you using ?

[kshegunov]

@VRonin said in Arrays of functions help:

void (MyClass::*functions[10])() ;

I hope you acknowledge most of us dinosaurs will typedef that. We are not masochists, only old-fashioned. ;)

[A Former User]

@VRonin said in Arrays of functions help:

let's go C++11 mental!

Okay :-)

void MainWindow::on_pushButton_clicked()
{
    std::array<std::function<void()>, 10> f;
    std::fill(std::begin(f), std::end(f), [=](){this->sayHi();});
    std::for_each(std::begin(f), std::end(f), [](auto &i){i();});
}