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[eos/base.git] / util / src / TclTk / tcl8.6.4 / doc / eval.n

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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH eval n "" Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-eval \- Evaluate a Tcl script
-.SH SYNOPSIS
-\fBeval \fIarg \fR?\fIarg ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-\fBEval\fR takes one or more arguments, which together comprise a Tcl
-script containing one or more commands.
-\fBEval\fR concatenates all its arguments in the same
-fashion as the \fBconcat\fR command, passes the concatenated string to the
-Tcl interpreter recursively, and returns the result of that
-evaluation (or any error generated by it).
-Note that the \fBlist\fR command quotes sequences of words in such a
-way that they are not further expanded by the \fBeval\fR command.
-.SH EXAMPLES
-.PP
-Often, it is useful to store a fragment of a script in a variable and
-execute it later on with extra values appended. This technique is used
-in a number of places throughout the Tcl core (e.g. in \fBfcopy\fR,
-\fBlsort\fR and \fBtrace\fR command callbacks). This example shows how
-to do this using core Tcl commands:
-.PP
-.CS
-set script {
-    puts "logging now"
-    lappend $myCurrentLogVar
-}
-set myCurrentLogVar log1
-# Set up a switch of logging variable part way through!
-after 20000 set myCurrentLogVar log2
-
-for {set i 0} {$i<10} {incr i} {
-    # Introduce a random delay
-    after [expr {int(5000 * rand())}]
-    update    ;# Check for the asynch log switch
-    \fBeval\fR $script $i [clock clicks]
-}
-.CE
-.PP
-Note that in the most common case (where the script fragment is
-actually just a list of words forming a command prefix), it is better
-to use \fB{*}$script\fR when doing this sort of invocation
-pattern.  It is less general than the \fBeval\fR command, and hence
-easier to make robust in practice.
-The following procedure acts in a way that is analogous to the
-\fBlappend\fR command, except it inserts the argument values at the
-start of the list in the variable:
-.PP
-.CS
-proc lprepend {varName args} {
-    upvar 1 $varName var
-    # Ensure that the variable exists and contains a list
-    lappend var
-    # Now we insert all the arguments in one go
-    set var [\fBeval\fR [list linsert $var 0] $args]
-}
-.CE
-.PP
-However, the last line would now normally be written without
-\fBeval\fR, like this:
-.PP
-.CS
-set var [linsert $var 0 {*}$args]
-.CE
-.SH "SEE ALSO"
-catch(n), concat(n), error(n), errorCode(n), errorInfo(n), interp(n), list(n),
-namespace(n), subst(n), uplevel(n)
-.SH KEYWORDS
-concatenate, evaluate, script
-'\" Local Variables:
-'\" mode: nroff
-'\" End: