#include <iostream>

using namespace std ;

class MyClass {
public:
    explicit operator bool() const {
        // Return true if the object is in a valid state, false otherwise
        cout << "Inside bool." << endl ;
        return true;
    }
};

int main() {
    MyClass obj;

    if (obj) { // Contextual conversion: explicit operator bool() is implicitly called
        // ...
    }

    bool b1 = static_cast<bool>(obj); // Explicit cast required
    // bool b2 = obj; // Error: explicit conversion not allowed in copy-initialization
}