Can´t create object if i have constructor in class

beginners
#1

So, really weird thing is happening to me.

I´ve made a class Particle :

#pragma once
#include "ofMain.h"
class Particle {
	Particle();
};

I declared it in my ofApp.h :

#pragma once
#include "ofMain.h"
#include "ofxSvg.h"
#include "Particle.h"
class ofApp : public ofBaseApp{

	public:
		void setup();
		void update();
		void draw();
		Particle p;
        //Particle ps [];
        //vector <Particle> particles;
    };

If I declared a single object I get this error of I declared an array of fixed elements I get this error:

'ofApp::ofApp(void)': attempting to reference a deleted function

But if I declared a vector of elements it works.What´s going on? What im missing?

#2

you are making the constructor private, try:

#pragma once
#include "ofMain.h"
class Particle {
public:
	Particle();
};
1 Like
#3

oh sorry, I forgot to put public in this example but I was doing it right on mine.

My real problem is :

if you define a class constructor with a paramater, lets say :

#pragma once
#include "ofMain.h"
class Particle {
	Particle(float _size);
};

In ofApp.h i put

class ofApp : public ofBaseApp{
	public:
		void setup();
		void update();
		void draw();
		Particle p;
        //Particle ps [];
        //vector <Particle> particles;
    };

I get the error that I was saying, but only if I put a parameter inside de constructor function.
What should I do if

i´ve tryed :
Particle p(20);
inside ofApp.h but still getting this error. Thought I can use Particle if I make it a local variable inside a function, but can´t declare it in ofApp.h.

#4

SOLVE IT ! .

So obvius
make 2 constructor functions inside my class. :

#pragma once
#include "ofMain.h"
class Particle {
public:
	Particle();
    Particle(float _size);
};

in ofApp.h now I can declare it normally :
Particle p;

And then in ofApp.cpp setup function inicialize like this :
p = Particle(20);

#5

yes when you declare a constructor with parameters the default constructor is not created anymore and you need to create it explicitly.

also if you really don’t want to have a default constructor you can also do in the declaration in ofApp.h

Particle p{20};

and even:

vector<Particle> ps{Particle{1}, Particle{2}, Particle{3}};
1 Like