Error C2280 : Class::Class(void) : Attempting to reference a deleted function - c++

Question

So, I am working on a project, and I have two files in this project:
main.cpp, matrix.h
The problem is that My code seemed to work perfectly a few hours ago, and now it doesn't
main.cpp:
#include <iostream>
#include "matrix.h"
#include <vector>
int main() {
Matrix f;
f.create(10, 1, {3, 4, 5, 6, 7, 8, 9});
}
matrix.h:
#pragma once
#include <iostream>
#include <string>
#include <Windows.h>
#include <vector>
class Matrix {
public:
const size_t N;
bool ifMatrixCreated;
const char* NOTENOUGH = "The size of the array should match to the width*height elements";
std::vector<int> arr;
int w, h;
void create(int width, int height, const std::vector<int> a) {
w = width;
h = height;
if (a.size() != width * height) {
ifMatrixCreated = false;
std::cout << "bello";
}
else {
ifMatrixCreated = true;
arr = a;
std::cout << "hello";
}
}
};
And when I compile, it generates this error (Using VS2019):
Error C2280 | 'Matrix::Matrix(void)': attempting to reference a deleted function Matrix | Line 5
It keeps saying that "The default constructor of Matrix cannot be referenced - It is a deleted function"
Can you help solve this error?
Thanks in advance.

Answer 1

Here is the correct working example. The error happens because every const data member must be initialized. And
The implicitly-declared or defaulted default constructor for class T is undefined (until C++11)defined as deleted (since C++11) if any of the following is true:
T has a const member without user-defined default constructor or a brace-or-equal initializer (since C++11).
#pragma once
#include <iostream>
#include <string>
//#include <Windows.h>
#include <vector>
class Matrix {
public:
//const size_t N;//this const data member must be initialised
const size_t N = 6;
bool ifMatrixCreated;
const char* NOTENOUGH = "The size of the array should match to the width*height elements";
std::vector<int> arr;
int w, h;
void create(int width, int height, const std::vector<int> a) {
w = width;
h = height;
if (a.size() != width * height) {
ifMatrixCreated = false;
std::cout << "bello";
}
else {
ifMatrixCreated = true;
arr = a;
std::cout << "hello";
}
}
};