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const member functions

Denver Dash
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I've been having trouble with my news reader. Sorry if I posted this message
multiple times...

Hi. I heard once that there is a way to allow a const member function to
alter the value of a member if the member is declared in some way. Can
someone tell me how to do that, or is this impossible?

For example:

class foo
specialdeclaration int index;
void bar() const
index = 0; \\ ok because index has been declared in a special way.


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