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Defines an assert
macro, and the cout
and cerr
utility
functions.
Assert the truth of an expression (or of a sequence of expressions).
syntax:
assert
?expr ?expr... [report:
?r-exp ?r-exp...]
If
(and
?expr ?expr...)
evaluates to anything but#f
, the result is the value of that expression. Otherwise, an error is reported.The error message will show the failed expressions, as well as the values of selected variables (or expressions, in general). The user may explicitly specify the expressions whose values are to be printed upon assertion failure – as ?r-exp that follow the identifier
report:
.Typically, ?r-exp is either a variable or a string constant. If the user specified no ?r-exp, the values of variables that are referenced in ?expr will be printed upon the assertion failure.