configbody man page on Manjaro

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configbody(n)			  [incr Tcl]			 configbody(n)


       itcl::configbody - change the "config" code for a public variable

       itcl::configbody className::varName body

       The  configbody	command is used outside of an [incr Tcl] class defini‐
       tion to define or redefine the configuration  code  associated  with  a
       public  variable.   Public variables act like configuration options for
       an object.  They can be modified outside	 the  class  scope  using  the
       built-in	 configure  method.   Each variable can have a bit of "config"
       code associate with it that is automatically executed when the variable
       is  configured.	 The configbody command can be used to define or rede‐
       fine this body of code.

       Like the body command, this facility allows a class definition to  have
       separate	 "interface" and "implementation" parts.  The "interface" part
       is a class command with declarations for methods, procs, instance vari‐
       ables  and  common variables.  The "implementation" part is a series of
       body and configbody commands.  If the "implementation" part is kept  in
       a  separate  file, it can be sourced again and again as bugs are fixed,
       to support interactive development.  When using the "tcl" mode  in  the
       emacs editor, the "interface" and "implementation" parts can be kept in
       the same file; as bugs are fixed, individual bodies can be  highlighted
       and sent to the test application.

       The  name  "className::varName"	identifies  the	 public variable being
       updated.	 If the body string starts with "@", it is treated as the sym‐
       bolic  name  for a C procedure.	Otherwise, it is treated as a Tcl com‐
       mand script.

       Symbolic names for C procedures are established by  registering	proce‐
       dures  via Itcl_RegisterC().  This is usually done in the Tcl_AppInit()
       procedure, which is automatically called when  the  interpreter	starts
       up.   In the following example, the procedure My_FooCmd() is registered
       with the symbolic name "foo".  This procedure can be referenced in  the
       configbody command as "@foo".
		  Tcl_Interp *interp;	  /* Interpreter for application. */
		  if (Itcl_Init(interp) == TCL_ERROR) {
		      return TCL_ERROR;

		  if (Itcl_RegisterC(interp, "foo", My_FooCmd) != TCL_OK) {
		      return TCL_ERROR;

       In  the	following example, a "File" class is defined to represent open
       files.  Whenever the "-name" option is configured, the existing file is
       closed,	and  a	new file is opened.  Note that the "config" code for a
       public variable is optional.  The "-access" option, for	example,  does
       not have it.
	      itcl::class File {
		  private variable fid ""

		  public variable name ""
		  public variable access "r"

		  constructor {args} {
		      eval configure $args
		  destructor {
		      if {$fid != ""} {
			  close $fid

		  method get {}
		  method put {line}
		  method eof {}

	      itcl::body File::get {} {
		  return [gets $fid]
	      itcl::body File::put {line} {
		  puts $fid $line
	      itcl::body File::eof {} {
		  return [::eof $fid]

	      itcl::configbody File::name {
		  if {$fid != ""} {
		      close $fid
		  set fid [open $name $access]

	      # See the File class in action:
	      File x

	      x configure -name /etc/passwd
	      while {![x eof]} {
		  puts "=> [x get]"
	      itcl::delete object x

       class, object, variable, configure

itcl				      3.0			 configbody(n)

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