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| [9] | 1 | .\" @(#)assert.3 6.2 (Berkeley) 5/12/86
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| 2 | .\"
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| 3 | .TH ASSERT 3 "May 12, 1986"
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| 4 | .AT 3
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| 5 | .SH NAME
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| 6 | assert \- program verification
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| 7 | .SH SYNOPSIS
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| 8 | .nf
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| 9 | .ft B
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| 10 | #include <assert.h>
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| 11 |
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| 12 | void assert(int \fIexpression\fP)
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| 13 | .fi
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| 14 | .SH DESCRIPTION
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| 15 | .B Assert
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| 16 | is a macro that indicates
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| 17 | .I expression
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| 18 | is expected to be true at this point in the program.
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| 19 | It causes an
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| 20 | .BR abort (3)
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| 21 | with a diagnostic comment on the standard output when
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| 22 | .I expression
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| 23 | is false (0).
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| 24 | Compiling with the
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| 25 | .BR cc (1)
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| 26 | option
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| 27 | .SM
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| 28 | .B \-DNDEBUG
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| 29 | effectively deletes
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| 30 | .B assert
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| 31 | from the program.
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| 32 | .SH DIAGNOSTICS
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| 33 | `Assertion "\fIexpression\fR" failed: file
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| 34 | .I f
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| 35 | line
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| 36 | .IR n .'
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| 37 | .I F
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| 38 | is the source file and
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| 39 | .I n
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| 40 | the source line number of the
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| 41 | .B assert
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| 42 | statement.
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