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# -*- tcl -*-
# # ## ### ##### ######## #############
# (C) 2009 Andreas Kupries
# @@ Meta Begin
# Package tcl::chan::zero 1.1
# Meta as::author {Andreas Kupries}
# Meta as::copyright 2009
# Meta as::license BSD
# Meta description Re-implementation of Memchan's zero
# Meta description channel. Based on Tcl 8.5's channel
# Meta description reflection support. Exports a single
# Meta description command for the creation of new
# Meta description channels. No arguments. Result is the
# Meta description handle of the new channel.
# Meta platform tcl
# Meta require TclOO
# Meta require tcl::chan::events
# Meta require {Tcl 8.5}
# @@ Meta End
# # ## ### ##### ######## #############
package require Tcl 8.5 9
package require TclOO
package require tcl::chan::events
# # ## ### ##### ######## #############
namespace eval ::tcl::chan {}
proc ::tcl::chan::zero {} {
return [::chan create {read} [zero::implementation new]]
}
oo::class create ::tcl::chan::zero::implementation {
superclass tcl::chan::events ; # -> initialize, finalize, watch
method initialize {args} {
my allow read
next {*}$args
}
# Generate and return a block of N null bytes, as requested.
# Zero device.
method read {c n} {
return [binary format @$n]
}
}
# # ## ### ##### ######## #############
package provide tcl::chan::zero 1.1
return
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