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Passing arrays to procs in Tcl
If you're writing a Tcl proc, you'll normally pass in parameters by value, specifying a $ in front of the variable whos contents you want to pass in in the calling sequence: dojob $passin If, however, passin is a Tcl array, tis won't work since $passin cannot be expanded to string. So you'll need to make the call using: dojob passin and then use upvar within the proc to access the data. INDIVIDUAL ELEMENTS of an array CAN be passed in to a Tcl Proc by value as they're simple strings: dojob $passin(demo) or dojob $passin($elname) References: our Procedures and Variable Scope and Tcl Array modules (written 2004-11-18, updated 2006-06-05) Associated topics are indexed under T207 - Tcl/Tk - Procedures and Variable Scope[3414] Passing back multiple results in Tcl - upvar and uplevel - (2011-09-01) [3192] Tcl - Some example of HOW TO in handling data files and formats - (2011-03-04) [2929] Passing a variable number of parameters in to a function / method - (2010-08-20) [2520] Global and Enable - two misused words! - (2009-11-30) [2476] Tcl - uplevel to run code at calling level - (2009-10-24) [2466] Tcl - passing arrays and strings in and back out of procs - (2009-10-22) [1782] Calling procs in Tcl and how it compares to Perl - (2008-09-02) [1404] Tcl - global, upvar and uplevel. - (2007-10-24) [1163] A better alternative to cutting and pasting code - (2007-04-26) [775] Do not duplicate your code - (2006-06-23) [409] Functions and commands with dangerous names - (2005-08-11) [308] Call by name v call by value - (2005-05-11) [96] Variable Scope - (2004-10-22) T208 - Tcl/Tk - Arrays and dicts [3582] Tcl collections - lists, dicts and array - (2012-01-16) [3415] User defined sorting and other uses of callbacks in Tcl and Tk - (2011-09-02) [1614] When an array is not an array - (2008-04-17) [1427] Arrays in Tcl - a demonstration - (2007-11-10) [1405] Sorting in Tcl - lists and arrays - (2007-10-24) [1283] Generating traffic for network testing - (2007-07-29) [1282] Stringing together Tcl scripts - (2007-07-29) [779] The fragility of pancakes - and better structures - (2006-06-26)
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