29.8 The mutable Qualifier

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Normally you can't modify the members of a constant object. If a member is declared mutable, it can be modified. For example:

 class sample {     public:        int i1;        mutable float f1; // ... }; const sample a_sample; a_sample.i1 = 1;    // Illegal, attempt to modify a constant a_sample.f1 = 1.0;  // Legal. f1 is mutable. 

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