I'm trying to create a neatly formatted table on C++ by setting the width of the different fields. I can use setw(n), doing something like
cout << setw(10) << x << setw(10) << y << endl;
or change ios_base::width
cout.width (10);
cout << x;
cout.width (10);
cout << y << endl;
The problem is, neither of the alternatives allows me to set a default minimum width, and I have to change it everytime I'll write something to the stream.
Does anybody knows a way I can do it without having to repeat the same call countless times? Thanks in advance.
You can create an object that overloads operator<<
and contains an iostream
object that will automatically call setw
internally. For instance:
class formatted_output
{
private:
int width;
ostream& stream_obj;
public:
formatted_output(ostream& obj, int w): width(w), stream_obj(obj) {}
template<typename T>
formatted_output& operator<<(const T& output)
{
stream_obj << setw(width) << output;
return *this;
}
formatted_output& operator<<(ostream& (*func)(ostream&))
{
func(stream_obj);
return *this;
}
};
You can now call it like the following:
formatted_output field_output(cout, 10);
field_output << x << y << endl;
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With