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[expr.log.and],[expr.log.or] improve wording symmetry and quality #6574

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[expr.log.and],[expr.log.or] improve wording symmetry and quality #6574

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42 changes: 22 additions & 20 deletions source/expressions.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -6810,20 +6810,21 @@
\end{bnf}

\pnum
The \tcode{\&\&} operator groups left-to-right. The operands are both
contextually converted to \keyword{bool}\iref{conv}.
The
result is \keyword{true} if both operands are \keyword{true} and
\keyword{false} otherwise. Unlike \tcode{\&}, \tcode{\&\&} guarantees
left-to-right evaluation: the second operand is not evaluated if the
first operand is \keyword{false}.
The \tcode{\&\&} operator groups left-to-right.
The operands are both contextually converted to \keyword{bool}\iref{conv}.
The result is a prvalue of type \keyword{bool}.
The result is
\keyword{true} if both operands are \keyword{true} and
\keyword{false} otherwise.

\pnum
The result is a \tcode{bool}.
\indextext{operator!side effects and logical AND}%
If the second expression is evaluated,
the first expression is sequenced before
the second expression\iref{intro.execution}.
The right operand is not evaluated if the left operand evaluates to \keyword{false}.
The left operand is sequenced before\iref{intro.execution} the right operand.
\begin{note}
The former behavior is sometimes called "short-circuiting".
The \tcode{\&} operator guarantees neither short-circuiting nor left-to-right evaluation.
\end{note}

\rSec2[expr.log.or]{Logical OR operator}%
\indextext{expression!logical OR}%
Expand All @@ -6837,20 +6838,21 @@
\end{bnf}

\pnum
The \tcode{||} operator groups left-to-right. The operands are both
contextually converted to \keyword{bool}\iref{conv}.
The \tcode{||} operator groups left-to-right.
The operands are both contextually converted to \keyword{bool}\iref{conv}.
The result is a prvalue of type \keyword{bool}.
The result is
\keyword{true} if either of its operands is \keyword{true}, and
\keyword{false} otherwise. Unlike \tcode{|}, \tcode{||} guarantees
left-to-right evaluation; moreover, the second operand is not evaluated
if the first operand evaluates to \keyword{true}.
\keyword{false} otherwise.

\pnum
The result is a \keyword{bool}.
\indextext{operator!side effects and logical OR}%
If the second expression is evaluated,
the first expression is sequenced before
the second expression\iref{intro.execution}.
The right operand is not evaluated if the left operand evaluates to \keyword{true}.
The left operand is sequenced before\iref{intro.execution} the right operand.
\begin{note}
The former behavior is sometimes called "short-circuiting".
The \tcode{|} operator guarantees neither short-circuiting nor left-to-right evaluation.
\end{note}

\rSec2[expr.cond]{Conditional operator}%
\indextext{expression!conditional operator}%
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