A matter of style or is it?

Which one do you prefer (the constructor does some work and sets valid_):

class A {
public:
  explicit operator bool() const { return valid; }

private:
  bool valid_ = false;
}

or

class A {
public:
  bool is_valid() const { return valid; }

private:
  bool valid_ = false;
}

On the caller side:

A a{};
if (a) {
    // is valid
}

or

A a{}
if (a.is_valid()) {
    // is valid
}

https://redd.it/1rz8gq5
@r_cpp