assert.3

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 3 代码 · 共 40 行

.\" SCCSID: @(#)assert.3	8.1	9/11/90
.TH assert 3
.SH Name
assert \- program verification
.SH Syntax
.B #include <assert.h>
.PP
.B assert(\fIexpression\fP)
.SH Description
.NXR "assert macro"
.NXR "program" "verifying"
The
.PN assert
macro indicates
.I expression
is expected to be true at this point in the program.
It causes an 
.MS abort 3 
with a diagnostic comment on the standard error when
.I expression
is false (0).
Compiling with the 
.MS cc 1
option \-DNDEBUG effectively deletes
.PN assert
from the program.
.SH Diagnostics
`Assertion failed: a, file
.I f
.I n'.
The
.I a 
is the assertion that failed; 
.I f
is the source file and
.I n
the source line number of the
.PN assert
statement.