.\" This file is part of the Public Domain C Library (PDCLib).
.\" Permission is granted to use, modify, and / or redistribute at will.
.\"
.Dd
.Dt assert 3
.Os
.\"
.Sh NAME
.Nm assert
.Nd validate assertion
.\"
.Sh SYNOPSIS
.In assert.h
.Fn "void assert" "<scalar expression>"
.\"
.Sh DESCRIPTION
If
.Dv NDEBUG
was defined when
.In assert.h
was last included, the macro
.Nm
results in no code being generated. Otherwise, if the expression evaluates to 
false, an error message is printed to 
.Va stderr
and execution is terminated by invoking
.Fn abort .
.Sh IMPLEMENTATION NOTES
The enclosing function of the call to
.Nm
will only be printed in the error message when compiling for C99, or a later
revision of the C standard. 
.\"
.Sh SEE ALSO
.Xr _Exit 3
.Xr quick_exit 3
.Xr exit 3
.Xr abort 3
.\"
.Sh STANDARDS
Conforming to
.St -isoC-90 ,
.St -isoC-99 .