Avoiding implicit conversion in constructor. The 'explicit' keyword doesn't help here

Question

I am able to avoid the implicit conversion of a constructor using the explicit keyword. So now, conversions like A a1 = 10; can be avoided.

Answer 1

The way to achieve this is to provide another constructor that would be a better match, and then delete it so you'll get an error. For your class, adding

template 
A(T) = delete;

Will stop the class from being constructed from anything that isn't an int