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add demo of function calls of const instance #17

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add demo of function calls of const instance #17

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43 changes: 43 additions & 0 deletions section2/const.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -65,8 +65,50 @@ class DemoClass final
{
m_mutex++;
}
void foo(){}
void bar() const {
// m_value++;
}
int get_mutex() const {
return m_mutex;
}
public:
DemoClass():m_value(0), m_mutex(0){}
};

// function calls of const instance
void case3() {
using namespace std;
DemoClass demo;
demo.get_value();
demo.save_data();
demo.foo();
demo.bar();
cout << "demo's m_mutex: " << demo.get_mutex() << '\n';

const DemoClass demo1;
demo1.save_data();
demo1.get_value();
// demo.foo();
demo1.bar();
demo1.get_mutex();
cout << "demo1's m_mutex: " << demo1.get_mutex() << '\n';

const DemoClass &demo2 = DemoClass();
demo2.save_data();
demo2.get_value();
// demo2.foo();
demo2.bar();
cout << "demo2's m_mutex: " << demo2.get_mutex() << '\n';

const DemoClass* demo3 = &demo;
demo3->get_value();
demo3->save_data();
// demo3->foo();
demo3->bar();
cout << "demo3's m_mutex: " << demo3->get_mutex() << '\n';
}


constexpr
int fib(int n)
Expand All @@ -84,6 +126,7 @@ int main()

case1();
case2();
case3();

constexpr
int fib5 = fib(5);
Expand Down