A Perl projekt vezet\u0151tan\u00e1csa \u00f6sszefoglalta a Perl 5 \u00e1g tov\u00e1bbi fejleszt\u00e9s\u00e9re \u00e9s a Perl 7 \u00e1g l\u00e9trehoz\u00e1s\u00e1ra vonatkoz\u00f3 terveket. A megbesz\u00e9l\u00e9sek sor\u00e1n a vezet\u0151tan\u00e1cs egyet\u00e9rtett abban, hogy nem szabad megs\u00e9rteni a m\u00e1r meg\u00edrt Perl 5 k\u00f3dok kompatibilit\u00e1s\u00e1t, kiv\u00e9ve, ha a kompatibilit\u00e1s megs\u00e9rt\u00e9se elengedhetetlen a sebezhet\u0151s\u00e9gek megsz\u00fcntet\u00e9se \u00e9rdek\u00e9ben. A tan\u00e1cs arra a k\u00f6vetkeztet\u00e9sre jutott, hogy a nyelvnek fejl\u0151dnie kell, \u00e9s a lehet\u0151 legintenz\u00edvebben kell n\u00e9pszer\u0171s\u00edteni az \u00faj lehet\u0151s\u00e9geket, egyszer\u0171s\u00edtve ezzel az \u00faj\u00edt\u00e1sokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st \u00e9s \u00f6szt\u00f6n\u00f6zve azok bevezet\u00e9s\u00e9t. <\/p>\n
A kezdeti sz\u00e1nd\u00e9kokkal ellent\u00e9tben, amelyek a Perl 7 \u00e1gban a visszafel\u00e9 kompatibilit\u00e1s megs\u00e9rt\u00e9s\u00e9t alap\u00e9rtelmezett\u00e9 tett\u00e9k, az \u00faj terv fokozatosan k\u00edv\u00e1nja \u00e1talak\u00edtani a Perl 5 \u00e1gat Perl 7-re an\u00e9lk\u00fcl, hogy megzavarn\u00e1 a megl\u00e9v\u0151 k\u00f3ddal val\u00f3 kompatibilit\u00e1st. A Perl 7.0 kiad\u00e1s konceptu\u00e1lisan nem fog k\u00fcl\u00f6nb\u00f6zni a k\u00f6vetkez\u0151 Perl 5.xx \u00e1gt\u00f3l. <\/p>\n
A Perl 5 \u00faj kiad\u00e1sainak fejleszt\u00e9se a kor\u00e1bbiak szerint folytat\u00f3dik \u2014 az \u00faj, r\u00e9gi k\u00f3ddal nem kompatibilis funkci\u00f3k, ahogy eddig is, csak a \"use version\" vagy a \"use feature\" pragm\u00e1k k\u00f3dba t\u00f6rt\u00e9n\u0151 explicit megad\u00e1s\u00e1val ker\u00fclnek be a sz\u00e1lba. P\u00e9ld\u00e1ul az 5.010-es Perl verzi\u00f3ban bemutatott \u00faj kulcssz\u00f3, a \"say\" eset\u00e9ben, mivel a megl\u00e9v\u0151 k\u00f3dban lehettek \"say\" nev\u0171 f\u00fcggv\u00e9nyek, az \u00faj kulcssz\u00f3 t\u00e1mogat\u00e1sa csak a \"use feature 'say'\" pragma k\u00f3dba t\u00f6rt\u00e9n\u0151 explicit megad\u00e1s\u00e1val aktiv\u00e1l\u00f3dott. <\/p>\n
Az \u00fajonnan hozz\u00e1adott szintaxis, amely a kor\u00e1bbi kiad\u00e1sok feldolgoz\u00e1sa sor\u00e1n hib\u00e1hoz vezetett, mostant\u00f3l azonnal el\u00e9rhet\u0151 an\u00e9lk\u00fcl, hogy k\u00fcl\u00f6nleges pragm\u00e1kat kellene megadni. P\u00e9ld\u00e1ul az 5.36-os Perl verzi\u00f3ban megjelenik egy egyszer\u0171s\u00edtett szintaxis a lista t\u00f6bb \u00e9rt\u00e9k\u00e9nek egyszeri feldolgoz\u00e1s\u00e1ra (\"foreach my ($key, $value) (%hash) {\"), amelyet azonnal el\u00e9rhet\u00fcnk, m\u00e9g a \"use v5.36\" pragma n\u00e9lk\u00fcli k\u00f3dban is. <\/p>\n
A Perl 5.36-os verzi\u00f3j\u00e1ban a \"use v5.36\" pragma haszn\u00e1latakor 13 visszafel\u00e9 kompatibilit\u00e1s megs\u00e9rt\u0151 lehet\u0151s\u00e9g (\"say\", \"state\", \"current_sub\", \"fc\", \"lexical_subs\", \"signatures\", \"isa\", \"bareword_filehandles\", \"bitwise\", \"evalbytes\", \"postderef_qq\", \"unicode_eval\" \u00e9s \"unicode_strings\") aktiv\u00e1l\u00f3dik alap\u00e9rtelmezetten, emellett a \"use strict\" \u00e9s a \"use warnings\" m\u00f3dok is enged\u00e9lyezve vannak, \u00e9s letilt\u00f3dik a r\u00e9gi t\u00edpus\u00fa objektumh\u00edv\u00e1si szintaxis t\u00e1mogat\u00e1sa (amikor a \"->\" helyett sz\u00f3k\u00f6z tal\u00e1lhat\u00f3), valamint a Perl 4 st\u00edlus\u00fa t\u00f6bbdimenzi\u00f3s t\u00f6mb\u00f6k \u00e9s hash-t\u00e1bl\u00e1k (\"$hash{1, 2}\"). <\/p>\n
Amikor elegend\u0151 v\u00e1ltoz\u00e1s felhalmoz\u00f3dik, a soron k\u00f6vetkez\u0151 Perl 5.x kiad\u00e1s helyett egy 7.0-\u00e1s Perl verzi\u00f3 j\u00f6n l\u00e9tre, amely a nyelv \u00e1llapot\u00e1nak egyfajta v\u00e1gott m\u00e1sa lesz, de teljesen visszafel\u00e9 kompatibilis marad a Perl 5-tel. A kompatibilit\u00e1s megs\u00e9rt\u0151 v\u00e1ltoz\u00e1sok \u00e9s be\u00e1ll\u00edt\u00e1sok bevon\u00e1s\u00e1hoz a k\u00f3dba expl\u00edcit m\u00f3don el kell helyezni a \"use v7\" pragm\u00e1t. Teh\u00e1t a \"use v7\" pragm\u00e1val rendelkez\u0151 k\u00f3dot \"modern Perl\"-nek tekinthetj\u00fck, amelyben el\u00e9rhet\u0151k a nyelv visszafel\u00e9 kompatibilit\u00e1s\u00e1t megs\u00e9rt\u0151 v\u00e1ltoz\u00e1sok, m\u00edg an\u00e9lk\u00fcl \"konzervat\u00edv Perl\"-nek min\u0151s\u00fcl, amely teljes m\u00e9rt\u00e9kben visszafel\u00e9 kompatibilis marad a kor\u00e1bbi kiad\u00e1sokkal. \u0423\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0432\u0435\u0442 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Perl \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u043f\u043b\u0430\u043d\u044b \u043f\u043e \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0435\u043c\u0443 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u044e \u0432\u0435\u0442\u043a\u0438 Perl 5 \u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044e \u0432\u0435\u0442\u043a\u0438 Perl 7. \u0412 \u0445\u043e\u0434\u0435 \u0434\u0438\u0441\u043a\u0443\u0441\u0441\u0438\u0439 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0432\u0435\u0442 \u0441\u043e\u0433\u043b\u0430\u0441\u0438\u043b\u0441\u044f, \u0447\u0442\u043e \u043d\u0435\u0434\u043e\u043f\u0443\u0441\u0442\u0438\u043c\u043e \u043d\u0430\u0440\u0443\u0448\u0430\u0442\u044c \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c \u0441 \u0443\u0436\u0435 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u043c \u0434\u043b\u044f Perl 5 \u043a\u043e\u0434\u043e\u043c, \u0437\u0430 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435\u0432, \u043a\u043e\u0433\u0434\u0430 \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u0435 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0434\u043b\u044f \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u0421\u043e\u0432\u0435\u0442 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u0448\u0451\u043b \u043a \u0432\u044b\u0432\u043e\u0434\u0443, \u0447\u0442\u043e \u044f\u0437\u044b\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u0438 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104162","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47A Perl 7 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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"