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.TH "struct::map" 3tcl 1 tcllib ""
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.BS
.SH NAME
struct::map \- Manage key/value maps
.SH SYNOPSIS
package require \fBstruct::map  ?1?\fR
.sp
\fB::struct::map\fR \fImapName\fR
.sp
\fBmapName\fR \fBmethod\fR ?\fIarg arg \&.\&.\&.\fR?
.sp
\fImapName\fR \fBget\fR
.sp
\fImapName\fR \fBnames\fR
.sp
\fImapName\fR \fBset\fR \fIname\fR ?\fIvalue\fR?
.sp
\fImapName\fR \fBunset\fR ?\fIpattern\fR\&.\&.\&.?
.sp
.BE
.SH DESCRIPTION
Provides a snit class whose instances manage a key/value map\&.
In other words, an object wrapper around Tcl arrays\&.
.SH API
The main command provides construction of maps:
.TP
\fB::struct::map\fR \fImapName\fR
Creates a new, empty map with an associated global Tcl command whose
name is \fImapName\fR\&.
It may be used to invoke various operations on the map\&.
It has the following general form:
.RS
.TP
\fBmapName\fR \fBmethod\fR ?\fIarg arg \&.\&.\&.\fR?
\fBmethod\fR and \fIarg\fRuments determine the exact behavior of
the command\&.
.RE
.IP
If \fImapName\fR is specified as \fB%AUTO%\fR a unique name will be
generated by the package itself\&.
The result of the command is the fully-qualified name of the instance
command\&.
.PP
.PP
The following commands are possible for map objects:
.TP
\fImapName\fR \fBget\fR
Returns the entire map as a Tcl dictionary\&.
.TP
\fImapName\fR \fBnames\fR
Returns the list of all keys known to the map, in arbitrary order\&.
.TP
\fImapName\fR \fBset\fR \fIname\fR ?\fIvalue\fR?
Sets key \fIname\fR to the specified \fIvalue\fR, if the value specified\&.
Returns the value for the key\&.
Throws an error if the key is not known\&.
.TP
\fImapName\fR \fBunset\fR ?\fIpattern\fR\&.\&.\&.?
Removes all keys matching at least one of the glob \fIpattern\fRs from
the map\&.
If no pattern is specified all keys are removed\&.
In other words, the default pattern is \fB*\fR\&.
The result of the command is the empty string\&.
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIstruct :: list\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.