cppdraft_translate/cppdraft/conv/bool.md

[conv.bool]

7 Expressions [expr]

7.3 Standard conversions [conv]

7.3.15 Boolean conversions [conv.bool]

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A prvalue of arithmetic, unscoped enumeration, pointer, or pointer-to-member type can be converted to a prvalue of type bool.

A zero value, null pointer value, or null member pointer value is converted to false; any other value is converted to true.