default constructor not generated?

Question

#include <iostream>    
using namespace std;

class T
{
    public:
    T(int h){item = h;}
    int item;    
};

int main()
{
    T a;
    cout << a.item << endl;
    return 0;
}

I am getting an error : cannot find T::T(), I know that the compiler does not generate an implicit constructor when I declare constructors with parameters, and this could be fixed by changing the constructor parameter to int h = 0, but is there any other way to get rid of error?

Answer 1

What other way are you searching? In any case you have to define the default constructor if you are going to use it.

For example you could define your class the following way

class T
{
    public:
    T() = default;
    T(int h){item = h;}
    int item = 0;
};

Or you have to define the constructor explicitly

class T
{
    public:
    T() : item( 0 ) {}
    T(int h){item = h;}
    int item;
};

And one more example

class T
{
    public:
    T() : T( 0 ) {}
    T(int h){item = h;}
    int item;
};