'''[http://www.tcl.tk/man/tcl/TclCmd/define.htm%|%oo::define]''', a [Tcl
commands%|%built-in] [Tcl] command, defines and changes the definition of existing classes in
[TclOO].



** Synopsis **

    :   '''oo::define''' ''class'' ''definitionScript''
    :   '''oo::define''' ''class'' ''arg'' ''arg'' ?''arg ...''?

If given as a sequence of ''arg''s, the ''definitionScript'' is created by
making a [list] of those arguments and evaluating that as if it was given as a
''definitionScript''.  Supported definitions for use in the
''definitionScript'' are:

    :   '''constructor''' ''argList bodyScript''
    :   '''deletemethod''' ''name'' ?''name ...''?
    :   '''destructor''' ''bodyScript''
    :   '''export''' ''name'' ?''name ...''?
    :   '''filter''' ?''methodName ...''?
    :   '''forward''' ''name cmdName'' ?''arg ...''?
    :   '''method''' ''name argList bodyScript''
    :   '''mixin''' ?''className ...''?
    :   '''renamemethod''' ''fromName toName''
    :   '''self''' ''subcommand arg ...''
    :   '''self''' ''script''
    :   '''superclass''' ''className'' ?''className ...''?
    :   '''unexport''' ''name'' ?''name ...''?
    :   '''variable''' ?''name ...''?



** Documentation **

   [http://www.tcl.tk/man/tcl8.6/TclCmd/define.htm%|%official reference]:   



** '''`forward`''' **

`[my]` can be used as the command name:

======
oo::objdefine myobject forward method2 my method1 
======



** Precursors, `Methods`, and Exports **

'''[PYK] 2017-12-12:'''

The act of creating a new method resets the current export setting for the
method.  In the following example, it is necessary to use '''`export`''' twice
in order for the invocation of `.~` to succeed.

======
oo::class create c1 {
    method .~ {} {
        puts {c1 method}
    }
    export .~
}

oo::class create c2 {
    superclass c1
    method .~ {} {
        puts {c2 method}
    }
    export .~
}

c2 create obj1
obj1 .~
======



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