# tads.h | documentation

    #charset "us-ascii"
    #pragma once

    /*
     *   Copyright (c) 1999, 2006 Michael J. Roberts
     *.  This file is part of TADS 3.
     *
     *   This file includes all of the standard TADS system headers, so programs
     *   can include this header alone rather than having to include all of the
     *   separate headers individually.
     */

    /*
     *   To allow the standard library and header files to be used with
     *   alternative I/O intrinsics, we explicitly use macros for the I/O
     *   dependencies in the library - specifically, the I/O intrinsic header
     *   file name, and the name of the default stream output function.
     *
     *   We define defaults for these if they aren't otherwise defined.  To
     *   compile library files with an alternative set of I/O intrinsics, define
     *   these symbols in the compiler (for example, by using the -D command-line
     *   option with t3make).
     */
    #ifndef TADS_IO_HEADER
    #define TADS_IO_HEADER "tadsio.h"
    #endif
    #ifndef _tads_io_say
    #define _tads_io_say(str) tadsSay(str)
    #endif

    /* include the T3 VM intrinsic function set */
    #include "t3.h"

    /* include the TADS general data manipulation function set */
    #include "tadsgen.h"

    /* include the TADS input/output function set */
    #include TADS_IO_HEADER

    /* include the system type definitions */
    #include "systype.h"

    /* if we're building a network program, include the net headers */
    #ifdef TADS_INCLUDE_NET
    #include <tadsnet.h>
    #include <httpsrv.h>
    #include <httpreq.h>
    #endif

    /* ------------------------------------------------------------------------ */
    /*
     *   Break out of a callback iteration, such as a forEachInstance() loop.
     *   This can be used within the callback code to break out of the loop.
     */
    #define breakLoop throw BreakLoopSignal

    /* ------------------------------------------------------------------------ */
    /*
     *   Define a property value using an expression that's evaluated once per
     *   instance of the class where the property is defined.  This is used like
     *   so:
     *
     *   class MyClass: MySuperClass
     *.    prop1 = perInstance(new SubObject())
     *.  ;
     *
     *   Now, for each instance of MyClass, prop1 will be set to a separate
     *   instance of SubObject.
     *
     *   Note that the per-instance property value is set "on demand" in each
     *   instance.  This means that a particular instance's copy of the property
     *   will be set when the property is first evaluated.  Note in particular
     *   that the value won't necessary be computed at compile time or during
     *   pre-initialization, because the value for a particular instance won't be
     *   calculated until the property is first used for a that instance.
     */
    #define perInstance(expr) (self.(targetprop) = (expr))

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