Usage of explicit in C ++ Constructor

We are writing an application.ProgramWhen the explicit it keyword is rarely used, it is used to "prohibit Single-parameter constructor" is used for automatic type conversion.

Class Aclass
{
Public:
Explicit Aclass(Int I): M_ I (I ){/*...*/};
//...
};

Aclass A(1 );// OK
Aclass B=Static_cast<Aclass> (2 );// OK
// Aclass B = 2; // Error
// A = 3; // Error

When we use the followingCodeHour

Class C1 {
Public:
C1 (int ){....}
}
C1 myone;
Myone = 5; // copy constructor called

A temporary object temp (5) is generated first, and then the temporary object temp is assigned to myone by using the copy constructor.

When explicit it is added before the C1 constructor name, myone = 5 cannot be compiled, because only the constructor can be called to create objects.