7 Expressions [expr]

7.6 Compound expressions [expr.compound]

7.6.14 Logical AND operator [expr.log.and]

The && operator groups left-to-right.
The operands are both contextually converted to bool.
The result is true if both operands are true and false otherwise.
Unlike &, && guarantees left-to-right evaluation: the second operand is not evaluated if the first operand is false.
The result is a bool.
If the second expression is evaluated, the first expression is sequenced before the second expression ([intro.execution]).