Lifetime of the variable defined in the for loop body

The non-static object defined in the for loop body has only one loop iteration, that is, the object will be automatically destroyed at the end of this loop.

The test code is as follows:

# Include <iostream>
Using namespace STD;

Class
...{
Public:
A ()... {cout <"in ctor of a" <Endl ;}
A (A &)... {cout <"in copy ctor of a" <Endl ;}
~ A ()... {cout <"in dtor of a" <Endl ;}

};

Int main (INT argc, char * argv [])
...{

A x;
Cout <"before loop" <Endl;

For (INT I = 0; I <3; I ++)
...{
A A = X;

}
Cout <Endl <"after loop" <Endl;

Return 1;
}

The running result of the program is

In ctor of
Before Loop

In copy ctor of
In dtor of
In copy ctor of
In dtor of
In copy ctor of
In dtor of

After Loop
In dtor of