class Entity {
private:
    std::string m_Name;
    int m_Age;

public:
    Entity(const std::string& name)           // ← single-argument ctor
        : m_Name(name), m_Age(-1) {}

    Entity(int age)                           // ← another single-argument ctor
        : m_Name("Unknown"), m_Age(age) {}
};

int main() {
    Entity a = "Cherno";     // compiles!
    Entity b = 22;           // also compiles!
}

The Fix: explicit Keyword

class Entity {
    // ...
public:
    explicit Entity(const std::string& name)
        : m_Name(name), m_Age(-1) {}

    explicit Entity(int age)
        : m_Name("Unknown"), m_Age(age) {}
};

Now what happens?

Entity a = "Cherno";     // COMPILE ERROR (good!)
Entity b = 22;           // COMPILE ERROR (good!)

Entity a("Cherno");                  // direct initialization → OK
Entity a = Entity("Cherno");         // explicit construction → OK
Entity b(22);                        // direct initialization → OK