Provided by: tcllib_1.21+dfsg-1_all 
NAME
stooop - Object oriented extension.
SYNOPSIS
package require Tcl 8.3
package require stooop ?4.4.1?
::stooop::class name body
::stooop::new class ?arg arg ...?
::stooop::delete object ?object ...?
::stooop::virtual proc name {this ?arg arg ...?} ?body?
::stooop::classof object
::stooop::new object
::stooop::printObjects ?pattern?
::stooop::record
::stooop::report ?pattern?
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DESCRIPTION
This package provides commands to extend Tcl in an object oriented manner, using a familiar C++ like
syntax and behaviour. Stooop only introduces a few new commands: class, new, delete, virtual and classof.
Along with a few coding conventions, that is basically all you need to know to use stooop. Stooop is
meant to be as simple to use as possible.
This manual is very succinct and is to be used as a quick reminder for the programmer, who should have
read the thorough stooop_man.html HTML documentation at this point.
::stooop::class name body
This command creates a class. The body, similar in contents to a Tcl namespace (which a class
actually also is), contains member procedure definitions. Member procedures can also be defined
outside the class body, by prefixing their name with class::, as you would proceed with namespace
procedures.
proc class {this ?arg arg ...?} ?base {?arg arg ...?} ...? body
This is the constructor procedure for the class. It is invoked following a new invocation
on the class. It must have the same name as the class and a first argument named this. Any
number of base classes specifications, including arguments to be passed to their
constructor, are allowed before the actual body of the procedure.
proc ~class {this} body
This is the destructor procedure for the class. It is invoked following a delete
invocation. Its name must be the concatenation of a single ~ character followed by the
class name (as in C++). It must have a single argument named this.
proc name {this ?arg arg ...?} body
This is a member procedure of the class, as its first argument is named this. It allows a
simple access of member data for the object referenced by this inside the procedure. For
example:
set ($this,data) 0
proc name {?arg arg ...?} body
This is a static (as in C++) member procedure of the class, as its first argument is not
named this. Static (global) class data can be accessed as in:
set (data) 0
proc class {this copy} body
This is the optional copy procedure for the class. It must have the same name as the class
and exactly 2 arguments named this and copy. It is invoked following a new invocation on an
existing object of the class.
::stooop::new class ?arg arg ...?
This command is used to create an object. The first argument is the class name and is followed by
the arguments needed by the corresponding class constructor. A unique identifier for the object
just created is returned.
::stooop::delete object ?object ...?
This command is used to delete one or several objects. It takes one or more object identifiers as
argument(s).
::stooop::virtual proc name {this ?arg arg ...?} ?body?
The virtual specifier may be used on member procedures to achieve dynamic binding. A procedure in
a base class can then be redefined (overloaded) in the derived class(es). If the base class
procedure is invoked on an object, it is actually the derived class procedure which is invoked, if
it exists. If the base class procedure has no body, then it is considered to be a pure virtual and
the derived class procedure is always invoked.
::stooop::classof object
This command returns the class of the existing object passed as single parameter.
::stooop::new object
This command is used to create an object by copying an existing object. The copy constructor of
the corresponding class is invoked if it exists, otherwise a simple copy of the copied object data
members is performed.
DEBUGGING
Environment variables
STOOOPCHECKDATA
Setting this variable to any true value will cause stooop to check for invalid member or
class data access.
STOOOPCHECKPROCEDURES
Setting this variable to any true value will cause stooop to check for invalid member
procedure arguments and pure interface classes instanciation.
STOOOPCHECKALL
Setting this variable to any true value will cause stooop to activate both procedure and
data member checking.
STOOOPCHECKOBJECTS
Setting this variable to any true value will cause stooop to activate object checking. The
following stooop namespace procedures then become available for debugging: printObjects,
record and report.
STOOOPTRACEPROCEDURES
Setting this environment variable to either stdout, stderr or a file name, activates
procedure tracing. The stooop library will then output to the specified channel 1 line of
informational text for each member procedure invocation.
STOOOPTRACEPROCEDURESFORMAT
Defines the trace procedures output format. Defaults to "class: %C, procedure: %p, object:
%O, arguments: %a".
STOOOPTRACEDATA
Setting this environment variable to either stdout, stderr or a file name, activates data
tracing. The stooop library will then output to the specified channel 1 line of
informational text for each member data access.
STOOOPTRACEDATAFORMAT
Defines the trace data output format. Defaults to "class: %C, procedure: %p, array: %A,
object: %O, member: %m, operation: %o, value: %v".
STOOOPTRACEDATAOPERATIONS
When tracing data output, by default, all read, write and unsetting accesses are reported,
but the user can set this variable to any combination of the letters r, w, and u for more
specific tracing (please refer to the trace Tcl manual page for more information).
STOOOPTRACEALL
Setting this environment variable to either stdout, stderr or a file name, enables both
procedure and data tracing.
::stooop::printObjects ?pattern?
Prints an ordered list of existing objects, in creation order, oldest first. Each output line
contains the class name, object identifier and the procedure within which the creation occurred.
The optional pattern argument (as in the Tcl string match command) can be used to limit the output
to matching class names.
::stooop::record
When invoked, a snapshot of all existing stooop objects is taken. Reporting can then be used at a
later time to see which objects were created or deleted in the interval.
::stooop::report ?pattern?
Prints the created and deleted objects since the ::stooop::record procedure was invoked last. If
present, the pattern argument limits the output to matching class names.
EXAMPLES
Please see the full HTML documentation in stooop_man.html.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please
report such in the category stooop of the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please
also report any ideas for enhancements you may have for either package and/or documentation.
When proposing code changes, please provide unified diffs, i.e the output of diff -u.
Note further that attachments are strongly preferred over inlined patches. Attachments can be made by
going to the Edit form of the ticket immediately after its creation, and then using the left-most button
in the secondary navigation bar.
KEYWORDS
C++, class, object, object oriented
CATEGORY
Programming tools
tcllib 4.4.1 stooop(3tcl)