Use of 'const' for function parameters

Question

How far do you go with const? Do you just make functions const when necessary or do you go the whole hog and use it everywhere? For example, imag

Answer 1

I use const on function parameters that are references (or pointers) which are only [in] data and will not be modified by the function. Meaning, when the purpose of using a reference is to avoid copying data and not to allow changing the passed parameter.

Putting const on the boolean b parameter in your example only puts a constraint on the implementation and doesn't contribute for the class's interface (although not changing parameters is usually advised).

The function signature for

void foo(int a);

and

void foo(const int a);

is the same, which explains your .c and .h

Asaf