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.\" ========================================================================
.\"
.IX Title "rarray_pop 3"
.TH rarray_pop 3 "2003-10-23" "Roy 1.0.7" "Roy API Docs"
.SH "NAME"
rarray_pop, rarray_push \- Stack like operators for Roy arrays.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
#include <roy.h>
.PP
void * rarray_push (RArray *\fIarray\fR);
.PP
void * rarray_pop (RArray *\fIarray\fR);
.PP
void * rarray_peek (RArray *\fIarray\fR);
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The intention of these functions is to create a stack interface to arrays
so that they may be easily used to create a stack.  This is especially
useful for small entries such as a single pointer or integer where the
overhead of linked lists is not needed or desired.
.PP
Due to rarray's auto-expanding behaviour, this essentially produces a
stack of infinite size, while still providing good speed.
.PP
\&\fIrarray_push\fR\|(3) is actually a macro that directly calls \fIrarray_append\fR\|(3),
but is named such so as to provide symmetry with the \fIrarray_pop\fR\|(3) function.
\&\fIrarray_push\fR\|(3) appends a new entry to \fIarray\fR.
.PP
\&\fIrarray_pop\fR\|(3) returns a pointer to the last entry in the array, and
then removes it from the array.  If there are no more entries in the
array, it returns \s-1NULL\s0.
.PP
\&\fIrarray_peek\fR\|(3) is actually a macro that directly calls \fIrarray_last\fR\|(3).
\&\fIrarray_peek\fR\|(3) returns the last entry in \fIarray\fR without removing it.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
These functions return pointers to entries in the array.  These
entries must then be cast to the appropriate types as defined when
created using \fIrarray_new\fR\|(3).
.SH "ERRORS"
.IX Header "ERRORS"
These calls produce no errors.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIrarray\fR\|(3), \fIrarray_append\fR\|(3), 
\&\fIrarray_free\fR\|(3), \fIrarray_last\fR\|(3), 
\&\fIrarray_len\fR\|(3), \fIrarray_new\fR\|(3), 
\&\fIrarray_nth\fR\|(3), \fIrarray_peek\fR\|(3), 
\&\fIrarray_push\fR\|(3), \fIrarray_set_len\fR\|(3), 
\&\fIroy\fR\|(3)