Ｐｒｏｂｌｅｍ ｉｎ Ｃｏｎｓｔ&

[whiteReve]

hi,

　i'm trying to avoid the copy made during the appel of a function by using const&,

　But it results a compilation error,

　here is a function, it works with <Compteur c> as argument,

　But when i add const& i get the following;(i don't understand it)

　Ｅｒｒｏｒ； passing 'const Compteur' as 'this' argument of 'unsigned int& Compteur::Val()' discards qualifiers [-fpermissive]|

void afficher(Compteur const& c)
{
　　cout << "Position : " << c.Val() << endl;
}

Val() is the getter of a private unsigned int called val。

thank u。

[ne555]

http://www.cplusplus.com/forum/beginner/138029/
you are annoying.

[whiteReve]

Ｓｏｒｒｙ　ｔｏ　ｂｅ　ａｎｎｏｙｉｎｇ，　Ｔｈａｎｋ　ｙｏｕ　Ｓｏ　ｍｕｃｈ。

[Smac89]

In your declaration of Val, make sure you add the const qualifier after the method, like so:

unsigned &Compteur::Val() const {
    ...
}

[whiteReve]

Smac89 , Thank u very much.