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.

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. The postfix or prefix -- operator cannot be applied to a variable of this type.

The bool type participates in 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.

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