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Showing content from https://timsong-cpp.github.io/cppwp/n4140/expr.log.or below:

[expr.log.or]

5.15 Logical OR operator [expr.log.or]
logical-or-expression:
    logical-and-expression
    logical-or-expression || logical-and-expression

The || operator groups left-to-right. The operands are both contextually converted to bool (Clause [conv]). It returns true if either of its operands is true, and false otherwise. Unlike |, || guarantees left-to-right evaluation; moreover, the second operand is not evaluated if the first operand evaluates to true.

The result is a bool. If the second expression is evaluated, every value computation and side effect associated with the first expression is sequenced before every value computation and side effect associated with the second expression.


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