Sequenced expressions
suggest changeThe following expressions are sequenced:
a && b
a || b
a , b
a ? b : c
for ( a ; b ; c ) { ... }
In all cases, the expression a
is fully evaluated and all side effects are applied before either b
or c
are evaluated. In the fourth case, only one of b
or c
will be evaluated. In the last case, b
is fully evaluated and all side effects are applied before c
is evaluated.
In all cases, the evaluation of expression a
is sequenced before the evaluations of b
or c
(alternately, the evaluations of b
and c
are sequenced after the evaluation of a
).
Thus, expressions like
x++ && x++
x++ ? x++ : y++
(x = f()) && x != 0
for ( x = 0; x < 10; x++ ) { ... }
y = (x++, x++);
have well defined behavior.
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