Given the definitions below. Each occurrence of a const is a promise to the compiler that the compiler will enforce. What is the promise in each case?
```
const int x = 17; //a)
class A
{
public:
A( );
A(int n):
int f( ) const; // b)
int g(const A& x); // c)
private:
int i;
```
What will be an ideal response?
In a) the promise is that any code written by the author will not change x.
In b) the promise is that any code written by the author in the definition of
A::f( )will not change the state of the calling object.
In c) the promise is that any code written by the author in the definition of
A::g(const A&x)will not change the argument in the invocation of this function.
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