QT how to pass Qlist to class Constructor - c++

Question

am trying to pass Qlist to class constructor but no success with it. I can pass basic variables but with Qlist am getting error in editor
error: no matching constructor for initialization of 'Worker'
compiler error
error: no matching function for call to 'Worker::Worker(QList<MainWindow::MainWindow(QWidget*)::pnp_com_info>&)'
Worker* worker = new Worker(pnp_data);
here is what am doing.
mainwindow.cpp
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
// my sample structure
struct pnp_com_info{
QString com_name = "";
int x = 0;
int y = 0;
int angle = 0;
bool status = false;
};
QList<pnp_com_info> pnp_data; // Qlist container
pnp_com_info pnp_component_data; // struct
// fill with data
pnp_component_data.com_name = "e18";
pnp_component_data.angle = 600;
// add it to Qlist container
pnp_data.append(pnp_component_data);
// Worker worker(5); // sample int passed OK.
// try to pass Qlist to worker constructor
Worker* worker = new Worker(pnp_data); // no success get error : no matching constructor for initialization of 'Worker'
}
worker.h source code
#ifndef WORKER_H
#define WORKER_H
#include <QObject>
class Worker : public QObject {
Q_OBJECT
public:
struct pnp_com_info{
QString com_name = "";
int x = 0;
int y = 0;
int angle = 0;
bool status = false;
};
// Worker(int sampleVar);
Worker(QList<pnp_com_info> pnpData);
~Worker();
public slots:
void doWork();
signals:
private:
QList<pnp_com_info> pnp_components_data;
};
#endif // WORKER_H
worker.cpp
#include "worker.h"
// --- CONSTRUCTOR ---
Worker::Worker(QList<pnp_com_info> pnp_data) {
// Worker::Worker(int sampleVar) {
this->pnp_components_data = pnp_data;
}
// --- DECONSTRUCTOR ---
Worker::~Worker() {
// free resources
}
// --- PROCESS ---
// Start processing data.
void Worker::doWork() {
// do some work
}
so any idea what am doing wrong. thanks

Answer 1

In the worker.cpp, you are not "inside" the class scope. So there you need to fully qualify the type:
Worker::Worker(QList<Worker::pnp_com_info> pnp_data) {
And then in MainWindow you of course need to use the same struct, Worker::pnp_com_info and not define a new struct type.
You might want to put the struct definition somewhere else than under Worker too. But where, that's impossible to advice on based on just the code you are showing; perhaps having it as nested struct inside Worker is a fine place for it.
I personally like to use Qt Creator (or whatever IDE I might be using, for any programming language) refactoring functionality to generate the method definition to .cpp file. Write the declaration inside th class in .h file as usual, then right click it to get context menu, select refactoring and select the generate option you want. Avoids mistakes like this and can save quite a lot if head banging especially when coding while a bit tired.