Purpose: to discuss the issues of when and how to write exception handling
code.

   * What is exception handling?
   * When should one write exception handling code?
   * When should one ''NOT'' write exception handling code?
   * What tools exist to aid in writing exception handling code? 
   * How exception handling works

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[hv] - Here is a short snippet showing how to use the [return] with -code to throw an exception

    proc double {x} {
        if {![string is integer $x]} {
            return -code error "double expects an int, not '$x'"
        }
    
        return [expr $x * 2]
    }
    
    set x 5
    puts "x = $x"
    puts "2x = [double $x]"
    
    set x "Hello"
    puts "x = $x"
    if {[catch {puts "2x = [double $x]"} errmsg]} {
        puts "Error: $errmsg"
    }













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[Category Discussion]