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    <p>That's not how Tcl's namespaces work. Each procedure is associated with exactly one namespace, which is the one in which its name is located. When you use <code>namespace import</code>, an alias to the procedure is placed in the importing namespace that allows the procedure to be invoked from that other namespace, but the procedure itself remains in its original namespace and executes in that one.</p> <p>If you want to know the caller's namespace, use <code>uplevel namespace current</code> (or <code>uplevel 1 {namespace current}</code> for a slightly windier but more efficient version). This doesn't actually tell you what namespace contained the command that was used to invoke the procedure though; for that, you need this monstrosity (in the invoked command):</p> <pre><code>namespace qualifiers [uplevel 1 [list namespace which [lindex [info level 0] 0]]] </code></pre> <p>Of course, if you're needing that a lot then you're probably doing something wrong. (That's obvious, given the length and complexity of code required to get the information.)</p> <p>In particular, if you're pretending to do object orientation with this, please stop and use a real object system that gets all the tricky details right. Tcl 8.6.0 includes <a href="http://www.tcl.tk/man/tcl8.6/TclCmd/class.htm" rel="nofollow">one</a> (<a href="http://www.tcl.tk/man/tcl8.6/ItclCmd/contents.htm" rel="nofollow">two</a>, if you've got the contributed extensions), and there are many for older versions available as extension packages.</p>
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    1. USDonal Fellows
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    1. COActually @Donal, I was trying to share code with several namespaces and carry have the same routines access, by default, the 'variable's in the different name spaces. In the case I was working on, I implemented pages where each page had a window and a large set of functions that it could use. In the end, I just included the functions in each name space. The application is for a tcl/tk spreadsheet program with named rows and columns. An early version of it is on sourceforge as tk#.
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    2. CO@Tom Really, that sounds (on first guessing about it) like you're reinventing Object Orientation. I've lost track of the times that that has been done (I've done it 3-4 times!) Please don't do it again. There are some very good production systems out there (Itcl, XOTcl, TclOO) that deal with the difficult edge cases. Save yourself a lot of work!
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    3. COOh, and TclOO is namespaces under the covers. Plus some clever dispatch code...
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