Operator bool overloaded

Question

Hi

Never heard the term operator bool overload.

I am aware about operator overloading for custom class but what this operator bool overloaded means? When it is executed for custom class and what is the need of that?

Answer 1

overloading the operator bool in C++ allows a class to define how it should be evaluated in a boolean context, this pattern is frequently used in smart pointers, file handles, and other resource-managing classes to check if they contain valid data or resources.

Answer 2

There is no bult in boolean data type like true or false in python, yeah but == and != operator can used as in the same way as bool and it's overloading is possible.

Answer 3

technically " operator bool() " is not an overloaded operator in the traditional sense ( like +, -, *, = which define how an operator works with your class ), but is a type conversion operator (also called a conversion operator or cast operator) which define how your class can be automatically or explicitly converted to another type.

" What to do on object to call this bool operator? " :
https://www.sololearn.com/en/compiler-playground/c4qTPGYLNYYu

https://en.cppreference.com/w/cpp/language/cast_operator

Answer 4

Thanks 𝒮𝑜𝒽𝒶𝒾𝒷 .

i am interested for C++.

I am aware about lt and gt related method in python for specific classes and so does operator < in c++

I got confused that c++ has something related to bool overloaded . I might be wrong also. So just checking what it is

Answer 5

1. What it does return ?

Return type operator bool()

2. It will not have any extra object as argument . Right ?

3. How to call this operator from class object?

For example, test obj;

What to do on obj object to call this bool operator?