fig20_02.cpp

// fig20_02.cpp
// Demonstrating storage-class specifier mutable.
#include <iostream>

// class TestMutable definition
class TestMutable {
public:
   TestMutable(int v = 0) : value{v} {}

   int getValue() const {
      return ++value; // increments value
   }
private:
   mutable int value; // mutable member
};

int main() {
   const TestMutable test{99};

   std::cout << "Initial value: " << test.getValue()
      << "\nModified value: " << test.getValue() << "\n";
}


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