What does it mean?

[Shervan360]

Hello,

Is this default constructor?

Thanks

#include <iostream>
#include<string>
using namespace std;

class myclass
{
	int x;
public:
	myclass(int i)
	{
		x = i;
	}
	int getx()
	{
		return x;
	}
};

int main()
{	
	myclass obj = 126; // Is this default constructor? 
	cout << obj.getx();

	
	return 0;
}

[keskiverto]

No, that is copy initialization. https://en.cppreference.com/w/cpp/language/copy_initialization

If you had myclass obj;, that would be default initialization. https://en.cppreference.com/w/cpp/language/default_initialization

Default initialization calls default constructor. https://en.cppreference.com/w/cpp/language/default_constructor



Note on your custom constructor:

myclass::myclass(int i)
{
  x = i; // this is copy assignment, not copy initialization
}

Initialization requires member initializer list syntax:

myclass::myclass(int i)
 : x{i} // this is direct initialization
{
  // empty body
}