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.TH LIBNORMALFORM_EVALUATE 3 LIBNORMALFORM
.SH NAME
libnormalform_evaluate \- Determine value of a formula
.SH SYNOPSIS
.nf
#include <libnormalform.h>
int libnormalform_evaluate(LIBNORMALFORM_SENTENCE *\fIformula\fP);
.fi
.PP
Link with
.IR -lnormalform .
.SH DESCRIPTION
The
.BR libnormalform_evaluate ()
function determines the value of
.IR formula .
.PP
Before calling the
.BR libnormalform_evaluate ()
function, the application must configure application
defined parts of the formula. That is, any
.IR "struct libnormalform_variable" ,
.IR "struct libnormalform_function" ,
.IR "struct libnormalform_map" ,
and
.IR "struct libnormalform_transformer"
must be set configuared accord to the specifications
specified for the function it was used in.
.SH RETURN VALUE
Upon successful completion, the
.BR libnormalform_evaluate ()
function returns 1 if the
.I formula
is true for configured input, 0 if the
.I formula
is false for configured input;
otherwise, the function returns
.IR -1 .
.SH ERRORS
The
.BR libnormalform_evaluate ()
function fails if an application function fails.
The
.BR libnormalform_evaluate ()
function does not modify
.IR errno ,
but lets application functions modify
.IR errno .
.SH ATTRIBUTES
For an explanation of the terms used in this
section, see
.BR attributes (7)
and
.IR "info \(dq(libc)POSIX Safety Concepts\(dq" .
.TS
allbox;
lb lb lb
l l l.
Interface Attribute Value
T{
.BR libnormalform_evaluate ()
T} Thread safety MT-Safe race:\fIsentence\fP
T{
.BR libnormalform_evaluate ()
T} Async-signal safety AS-Unsafe heap
T{
.BR libnormalform_evaluate ()
T} Async-cancel safety AC-Safe mem, AC-Unsafe heap
.TE
.SH SEE ALSO
.BR libnormalform (7)
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