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    Command:

    proc

    
           proc - Create a Tcl procedure
    
    
    

    SYNOPSIS

           proc name args body
    
    

    _________________________________________________________________

    
    
    

    DESCRIPTION

           The  proc command creates a new Tcl procedure named name, replacing any
           existing command or procedure there may have been by that name.   When-
           ever  the new command is invoked, the contents of body will be executed
           by the Tcl  interpreter.   Normally,  name  is  unqualified  (does  not
           include  the names of any containing namespaces), and the new procedure
           is created in the current namespace.  If name  includes  any  namespace
           qualifiers,  the procedure is created in the specified namespace.  Args
           specifies the formal arguments to the  procedure.   It  consists  of  a
           list,  possibly  empty,  each of whose elements specifies one argument.
           Each argument specifier is also a list with either one or  two  fields.
           If there is only a single field in the specifier then it is the name of
           the argument; if there are two fields, then the first is  the  argument
           name  and the second is its default value.  Arguments with default val-
           ues that are followed by non-defaulted arguments become required  argu-
           ments.  In 8.6 this will be considered an error.
    
           When  name  is invoked a local variable will be created for each of the
           formal arguments to the procedure; its value will be the value of  cor-
           responding  argument  in the invoking command or the argument's default
           value.  Actual arguments are assigned to formal arguments  strictly  in
           order.  Arguments with default values need not be specified in a proce-
           dure invocation.  However, there must be enough  actual  arguments  for
           all  the formal arguments that do not have defaults, and there must not
           be any extra actual arguments.  Arguments with default values that  are
           followed  by  non-defaulted arguments become required arguments (in 8.6
           it will be considered an error).  There is one special case  to  permit
           procedures  with  variable  numbers  of  arguments.  If the last formal
           argument has the name args, then a call to the  procedure  may  contain
           more  actual  arguments  than the procedure has formals.  In this case,
           all of the actual arguments starting at the one that would be  assigned
           to  args  are  combined  into  a  list (as if the list command had been
           used); this combined value is assigned to the local variable args.
    
           When body is being executed, variable names  normally  refer  to  local
           variables,  which are created automatically when referenced and deleted
           when the procedure returns.  One local variable is  automatically  cre-
           ated  for  each of the procedure's arguments.  Other variables can only
           be accessed by invoking one of the global, variable, upvar or namespace
           upvar commands.
    
           The proc command returns an empty string.  When a procedure is invoked,
           the procedure's return value is the value specified in  a  return  com-
           mand.   If  the procedure does not execute an explicit return, then its
           return value is the value of the last command executed  in  the  proce-
                  proc mult {varName {multiplier 2}} {
                     upvar 1 $varName var
                     set var [expr {$var * $multiplier}]
                  }
    
    
    

    SEE ALSO

           info(3tcl), unknown(3tcl)
    
    
    

    KEYWORDS

           argument, procedure
    
    
    

    Tcl proc(3tcl)

    
    
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