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WarCraft III Modding
Return Bug
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<blockquote data-quote="Mad-Ness" data-source="post: 116808" data-attributes="member: 5867"><p>Ok, so im going to explain the return bug.</p><p>The return bug in JASS is were you can return a varible different to the varible type to what it says it will return.</p><p>Classis example:</p><p></p><p>function H2I takes handle h returns integer</p><p> return h</p><p> return 0</p><p>endfunction</p><p></p><p>Here, it actually returns 'h', which is not the a integer.</p><p>'h' Is a handle, a handle is a unit, player, unit group, timer, dialog, or anything else that is NOT a integer, string, real or boolean.</p><p>The parser that checks if the script is ok, only checks if the last return type is correct.</p><p>So you can return practiaclly anything.</p><p>example:</p><p></p><p>function Unit2Integer takes unit u return integer</p><p> return u</p><p> return 0</p><p>endfunction</p><p></p><p>NOTE: always return 0, and not any other value, this can make your game get very strange if done otherwise.</p><p></p><p>This is where 'handle varibles' begin.</p><p>If you can convert any 'handle' into a integer. You can store any handle into a cache and reload it.</p><p>Without the return bug, JASS would be limited to the few BJ's and custom made function that are here today.</p><p>Really, it shouldent be called the return bug, more like the return blessing</p><p>To make things easier to understand handles and parameters, iv took this list out of common.j and made it easier to understand.</p><p></p><p>type: event.....Varible Type: handle </p><p>type: player.....Varible Type: handle </p><p>type: widget.....Varible Type: handle </p><p>type: unit.....Varible Type: widget </p><p>type: destructable.....Varible Type: widget</p><p>type: item.....Varible Type: widget</p><p>type: ability.....Varible Type: handle</p><p>type: buff.....Varible Type: ability</p><p>type: force.....Varible Type: handle</p><p>type: group.....Varible Type: handle</p><p>type: trigger.....Varible Type: handle</p><p>type: triggercondition.....Varible Type: handle</p><p>type: triggeraction.....Varible Type: handle</p><p>type: timer.....Varible Type: handle</p><p>type: location.....Varible Type: handle</p><p>type: region.....Varible Type: handle</p><p>type: rect.....Varible Type: handle</p><p>type: boolexpr.....Varible Type: handle</p><p>type: sound.....Varible Type: handle</p><p>type: conditionfunc.....Varible Type: boolexpr</p><p>type: filterfunc.....Varible Type: boolexpr</p><p>type: unitpool.....Varible Type: handle</p><p>type: itempool.....Varible Type: handle</p><p>type: race.....Varible Type: handle</p><p>type: alliancetype.....Varible Type: handle</p><p>type: racepreference.....Varible Type: handle</p><p>type: gamestate.....Varible Type: handle</p><p>type: igamestate.....Varible Type: gamestate</p><p>type: fgamestate.....Varible Type: gamestate</p><p>type: playerstate.....Varible Type: handle</p><p>type: playerscore.....Varible Type: handle</p><p>type: playergameresult.....Varible Type: handle</p><p>type: unitstate.....Varible Type: handle</p><p>type: aidifficulty.....Varible Type: handle</p><p></p><p>type: eventid.....Varible Type: handle</p><p>type: gameevent.....Varible Type: eventid</p><p>type: playerevent.....Varible Type: eventid</p><p>type: playerunitevent.....Varible Type: eventid</p><p>type: unitevent.....Varible Type: eventid</p><p>type: limitop.....Varible Type: eventid</p><p>type: widgetevent.....Varible Type: eventid</p><p>type: dialogevent.....Varible Type: eventid</p><p>type: unittype.....Varible Type: handle</p><p></p><p>type: gamespeed.....Varible Type: handle</p><p>type: gamedifficulty.....Varible Type: handle</p><p>type: gametype.....Varible Type: handle</p><p>type: mapflag.....Varible Type: handle</p><p>type: mapvisibility.....Varible Type: handle</p><p>type: mapsetting.....Varible Type: handle</p><p>type: mapdensity.....Varible Type: handle</p><p>type: mapcontrol.....Varible Type: handle</p><p>type: playerslotstate.....Varible Type: handle</p><p>type: volumegroup.....Varible Type: handle</p><p>type: camerafield.....Varible Type: handle</p><p>type: camerasetup.....Varible Type: handle</p><p>type: playercolor.....Varible Type: handle</p><p>type: placement.....Varible Type: handle</p><p>type: startlocprio.....Varible Type: handle</p><p>type: raritycontrol.....Varible Type: handle</p><p>type: blendmode.....Varible Type: handle</p><p>type: texmapflags.....Varible Type: handle</p><p>type: effect.....Varible Type: handle</p><p>type: effecttype.....Varible Type: handle</p><p>type: weathereffect.....Varible Type: handle</p><p>type: terraindeformation.....Varible Type: handle</p><p>type: fogstate.....Varible Type: handle</p><p>type: fogmodifier.....Varible Type: handle</p><p>type: dialog.....Varible Type: handle</p><p>type: button.....Varible Type: handle</p><p>type: quest.....Varible Type: handle</p><p>type: questitem.....Varible Type: handle</p><p>type: defeatcondition.....Varible Type: handle</p><p>type: timerdialog.....Varible Type: handle</p><p>type: leaderboard.....Varible Type: handle</p><p>type: multiboard.....Varible Type: handle</p><p>type: multiboarditem.....Varible Type: handle</p><p>type: trackable.....Varible Type: handle</p><p>type: gamecache.....Varible Type: handle</p><p>type: version.....Varible Type: handle</p><p>type: itemtype.....Varible Type: handle</p><p>type: texttag.....Varible Type: handle</p><p>type: attacktype.....Varible Type: handle</p><p>type: damagetype.....Varible Type: handle</p><p>type: weapontype.....Varible Type: handle</p><p>type: soundtype.....Varible Type: handle</p><p>type: lightning.....Varible Type: handle</p><p>type: pathingtype.....Varible Type: handle</p><p>type: image.....Varible Type: handle</p><p>type: ubersplat.....Varible Type: handle</p><p></p><p>Ok, that raps things up, thats the basics about the, the god, 'return bug'</p></blockquote><p></p>
[QUOTE="Mad-Ness, post: 116808, member: 5867"] Ok, so im going to explain the return bug. The return bug in JASS is were you can return a varible different to the varible type to what it says it will return. Classis example: function H2I takes handle h returns integer return h return 0 endfunction Here, it actually returns 'h', which is not the a integer. 'h' Is a handle, a handle is a unit, player, unit group, timer, dialog, or anything else that is NOT a integer, string, real or boolean. The parser that checks if the script is ok, only checks if the last return type is correct. So you can return practiaclly anything. example: function Unit2Integer takes unit u return integer return u return 0 endfunction NOTE: always return 0, and not any other value, this can make your game get very strange if done otherwise. This is where 'handle varibles' begin. If you can convert any 'handle' into a integer. You can store any handle into a cache and reload it. Without the return bug, JASS would be limited to the few BJ's and custom made function that are here today. Really, it shouldent be called the return bug, more like the return blessing To make things easier to understand handles and parameters, iv took this list out of common.j and made it easier to understand. type: event.....Varible Type: handle type: player.....Varible Type: handle type: widget.....Varible Type: handle type: unit.....Varible Type: widget type: destructable.....Varible Type: widget type: item.....Varible Type: widget type: ability.....Varible Type: handle type: buff.....Varible Type: ability type: force.....Varible Type: handle type: group.....Varible Type: handle type: trigger.....Varible Type: handle type: triggercondition.....Varible Type: handle type: triggeraction.....Varible Type: handle type: timer.....Varible Type: handle type: location.....Varible Type: handle type: region.....Varible Type: handle type: rect.....Varible Type: handle type: boolexpr.....Varible Type: handle type: sound.....Varible Type: handle type: conditionfunc.....Varible Type: boolexpr type: filterfunc.....Varible Type: boolexpr type: unitpool.....Varible Type: handle type: itempool.....Varible Type: handle type: race.....Varible Type: handle type: alliancetype.....Varible Type: handle type: racepreference.....Varible Type: handle type: gamestate.....Varible Type: handle type: igamestate.....Varible Type: gamestate type: fgamestate.....Varible Type: gamestate type: playerstate.....Varible Type: handle type: playerscore.....Varible Type: handle type: playergameresult.....Varible Type: handle type: unitstate.....Varible Type: handle type: aidifficulty.....Varible Type: handle type: eventid.....Varible Type: handle type: gameevent.....Varible Type: eventid type: playerevent.....Varible Type: eventid type: playerunitevent.....Varible Type: eventid type: unitevent.....Varible Type: eventid type: limitop.....Varible Type: eventid type: widgetevent.....Varible Type: eventid type: dialogevent.....Varible Type: eventid type: unittype.....Varible Type: handle type: gamespeed.....Varible Type: handle type: gamedifficulty.....Varible Type: handle type: gametype.....Varible Type: handle type: mapflag.....Varible Type: handle type: mapvisibility.....Varible Type: handle type: mapsetting.....Varible Type: handle type: mapdensity.....Varible Type: handle type: mapcontrol.....Varible Type: handle type: playerslotstate.....Varible Type: handle type: volumegroup.....Varible Type: handle type: camerafield.....Varible Type: handle type: camerasetup.....Varible Type: handle type: playercolor.....Varible Type: handle type: placement.....Varible Type: handle type: startlocprio.....Varible Type: handle type: raritycontrol.....Varible Type: handle type: blendmode.....Varible Type: handle type: texmapflags.....Varible Type: handle type: effect.....Varible Type: handle type: effecttype.....Varible Type: handle type: weathereffect.....Varible Type: handle type: terraindeformation.....Varible Type: handle type: fogstate.....Varible Type: handle type: fogmodifier.....Varible Type: handle type: dialog.....Varible Type: handle type: button.....Varible Type: handle type: quest.....Varible Type: handle type: questitem.....Varible Type: handle type: defeatcondition.....Varible Type: handle type: timerdialog.....Varible Type: handle type: leaderboard.....Varible Type: handle type: multiboard.....Varible Type: handle type: multiboarditem.....Varible Type: handle type: trackable.....Varible Type: handle type: gamecache.....Varible Type: handle type: version.....Varible Type: handle type: itemtype.....Varible Type: handle type: texttag.....Varible Type: handle type: attacktype.....Varible Type: handle type: damagetype.....Varible Type: handle type: weapontype.....Varible Type: handle type: soundtype.....Varible Type: handle type: lightning.....Varible Type: handle type: pathingtype.....Varible Type: handle type: image.....Varible Type: handle type: ubersplat.....Varible Type: handle Ok, that raps things up, thats the basics about the, the god, 'return bug' [/QUOTE]
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