bool (C++)
This keyword is a built-in type. A variable of this type can have values true and false. Conditional expressions have the type bool and so have values of type bool. For example, i != 0 now has true or false depending on the value of i.
Visual Studio 2017 version 15.3 and later (Available with /std:c++17 and later): The operand of a postfix or prefix increment or decrement operator may not be of type bool. In other words, given a variable b of type bool, these expressions are no longer allowed:
b++;
++b;
b--;
--b;
The values true and false have the following relationship:
!false == true
!true == false
In the following statement:
if (condexpr1) statement1;
If condexpr1 is true, statement1 is always executed; if condexpr1 is false, statement1 is never executed.
When a postfix or prefix ++ operator is applied to a variable of type bool, the variable is set to true.
Visual Studio 2017 version 15.3 and later: operator++ for bool was removed from the language and is no longer supported.
The postfix or prefix -- operator can't be applied to a variable of this type.
The bool type participates in default integral promotions. An r-value of type bool can be converted to an r-value of type int, with false becoming zero and true becoming one. As a distinct type, bool participates in overload resolution.