What Does Putting Two Constant Signs On A Function Parameter Do?

Question

I was wondering what two constant signs on a function parameter does in this case?

void virtual_via_pointer( const Employee * const );

The pointer and the pointee are both const. – user2357112 Mar 17 '14 at 05:03 — user2357112, Mar 17 '14 at 05:03
@ShanePowell, It definitely is a duplicate. – R Sahu Mar 17 '14 at 05:14 — R Sahu, Mar 17 '14 at 05:14

score 1 · Accepted Answer · answered Mar 17 '14 at 05:05

1

This isn't specific to function parameters.

const Employee*

Means a "mutable pointer to a constant instance of Employee".

Employee* const

Means a "constant pointer to a mutable instance of Employee".

const Employee* const

Means a "constant pointer to a constant instance of Employee".

See also the Spiral Rule.

answered Mar 17 '14 at 05:05

geometrian

That is a pretty cool way of thinking of it. Thank you, that helps alot – anacy Mar 17 '14 at 05:17

score 0 · Answer 2 · answered Mar 17 '14 at 05:06

0

The pointer and the pointee are both constant.

answered Mar 17 '14 at 05:06

kiDDevil

2 Answers2