C++ singleton ka baarakɛcogo ɲuman

Singleton dafalen ɲinini : C++ gɛlɛya banbali

porozɛw dilanni cogoyaw ka yɔrɔba la, mɔgɔ damadɔ de ye sɔsɔli, kokuradonni, ani hali sɔsɔli caman lawuli i n’a fɔ Singleton. A laɲini ka nɔgɔn nanbarako la : k’a lajɛ ko kalanso dɔ ka misali kelen dɔrɔn de bɛ yen ani ka diɲɛ seleke naani sɔrɔyɔrɔ di a ma. K’a ta labɛnni sigicogo ɲɛnabɔli la ka se sɔrɔli kɔlɔsili ma nafolo jɛlen dɔ la i n’a fɔ kunnafonidilanw jɛgɛnsira, Singleton misali bɛ mago kelen ɲɛnabɔ. Nka, C++ kɔnɔ, ka Singleton sɔrɔ min bɛ se ka kɛ jirisunw ye, min bɛ baara kɛ ka ɲɛ, wa min tɛ jaan nɔgɔlenw ye, o ye taama ye kan yɛrɛ jiginni na. O ye baarakɛcogo ni dannaya ɲinini ye min bɛ hakilina jira min bɛ kɛnɛbaw kɔfɛ i n’a fɔ Mewayz, yɔrɔ min na, modulu yɔrɔ barikamaw, minnu bɛ baara kɛ ka ɲɛ, olu nafa ka bon jago baarakɛcogo sabatilen jɔli la. Waleya "ɲuman" tɛ jaabi kelen ye nka wajibiyalenw balansi don kɛrɛnkɛrɛnnenya la i ka porozɛ kɔnɔko la.

daminɛ nalonma ani farati minnu bɛ sɔrɔ caman na

Singleton waleyali min ka nɔgɔn kosɛbɛ, o bɛ baara kɛ ni baarakɛcogo jɔlen ye min bɛ misali da weleli fɔlɔ la. Nka, nin klasiki fɛɛrɛ in bɛ filiba dɔ mara diɲɛ kɔnɔ min kɔnɔna na, fɛn caman bɛ yen. Ni jirisun caman bɛ waati kelen na k’a lajɛ ni misali in bɛ yen, u bɛɛ bɛ se k’a ye ko a tɛ foyi ye, ka taa ɲɛ k’u yɛrɛ ka misaliw da, o bɛ na ni misali in sariyakolo jɔnjɔn tiɲɛni jɛlen ye. Hali n’a y’a sɔrɔ mutex lock farali dabɔli hakilina lamini na, o bɛ kunnafonidilan boli ɲɛnabɔ, o bɛ baarakɛcogo buteliba dɔ don a kɔnɔ. Weele bɛɛ min bɛ Kɛ instance-getter ma, hali ni Singleton daminɛna pewu, o bɛ na ni dakunw dabɔli ni dabɔli ye, o min tɛ mako ɲɛ, wa a musaka ka bon. O bɛ tali kɛ jagokɛcogo dɔ jɔli la, baarakɛla bɛɛ ka kan ka so dɔ konnɛgɛ ɲini waati jan da wulilen kɔfɛ kudayi, o ye waati ni nafolo tiɲɛni ye. Module sitɛmu min bɛ baara kɛ kosɛbɛ i n’a fɔ Mewayz, o baarakɛbaliya sugu la core nivo la, o tɛna sɔn.

Bi C++ ɲɛnabɔcogo : `std::call_once` ani The Magic Statics

C++11 sariyasun nana ni baarakɛminɛn barikamaw ye minnu ye Singleton waleyali ɲɛ kosɛbɛ. Fɛɛrɛ min barika ka bon kosɛbɛ ani min bɛ Lakodɔn kosɛbɛ bi, o bɛ "Magic Static" baarakɛcogo Kɛ. Ni an y’a Jira ko Singleton misali in ye fɛn ye min bɛ 'yɔrɔ la min bɛ 'yɔrɔ la baarakɛcogo 'kɔnɔ (sanni a ka Kɛ 'yɔrɔ ye min bɛ 'yɔrɔ la min bɛ Weele ko classe static), an bɛ kan ka garanti (daɲɛ) Kɛ ko 'yɔrɔ jɔlen bɛ Daminɛ cogo la min bɛ Se ka Kɛ 'sèn ye. Daɲɛgafe-bɔla bɛ dakun wajibiyalenw ɲɛnabɔ hood jukɔrɔ, nka daminɛ daminɛ waati dɔrɔn. Weele nataw bɛ teliya i n’a fɔ pointeur check nɔgɔman. Nin fɛɛrɛ in, min bɛ waleya tuma caman na ni `std::call_once` ye walasa ka kunnafoni jɛlenw di, o bɛ daminɛ lafiyalen ni baarakɛcogo ɲuman fila bɛɛ di.

• Thread-Safe Initialization : Garanti bɛ C++ sariya fɛ , ka siya cogoyaw ban dabɔli waati .
• Lazy Instantiation : misali bɛ dabɔ dɔrɔn ni a mago bɛ a la fɔlɔ , ka nafolo mara .
• Minimal Runtime Overhead : daminɛ kɔfɛ , misali sɔrɔli musaka tɛ jate .
• nɔgɔya : kode saniyalen don , a faamuyali ka nɔgɔn , a fili ka gɛlɛn .

O balansi min bɛ lakana , baarakɛcogo ɲuman ani nɔgɔya la , o ye sanu sariya ye baarakɛcogo fanba la . A b’a to modulu koloma dɔ, i n’a fɔ baarakɛminɛn min bɛ Mewayz OS kɔnɔ, o bɛ misali ta cogo la min bɛ se ka da a kan, wa a bɛ baara kɛ ka ɲɛ porogaramu ka ɲɛnamaya kɔnɔna bɛɛ la.

ni baara kɛcogo ye fɛnba ye : The Meyers Singleton

"Magic Static" misali waleyali kɛrɛnkɛrɛnnen dɔ ka ɲi kosɛbɛ wa a bɛ nɔ bɔ fo a tɔgɔ dara a ka ntolatantɔn ŋana Scott Meyers kan. Meyers Singleton bɛ jate tuma caman na ko a ye baarakɛcogo bɛɛ lajɛlen ɲɛnabɔcogo ɲuman ye bi C++ la. A surunyalen don kosɛbɛ:

ye "N’a sɔrɔla Meyers Singleton ye fɛɛrɛ ɲumanba ye ka Singleton waleyali Kɛ C++ kɔnɔ bawo a bɛ baara Kɛ ni daɲɛgafe-sɛbɛnni-sɔrɔ-daminɛ statiki ye, ka baara kɛcogo ɲuman Di weleli fɔlɔ kɔfɛ."(Alimankan na)

Nin misali in ka ɲi kosɛbɛ Singletonw ma minnu bɛ sɔrɔ tuma caman daminɛ kɔfɛ. A ka baarakɛcogo bɛ bɛn sigida magow ma i n’a fɔ Mewayz, yɔrɔ min na baarakɛminɛn jɔnjɔnw ka kan ka sɔrɔ o yɔrɔnin bɛɛ la k’a sɔrɔ u ma latɛmɛni don sen kan, k’a to jagokɛcogo belebelebaw ka to ka kɛ cogo la min tɛ fɛn tiɲɛ ani ka jaabi di.

Kunnafoni : Baarakɛminɛn ɲuman sugandili

C++ Singleton baarakɛcogo "ɲuman" ɲinini bɛ laban bi misaliw la minnu bɛ se ka kɛ C++11 fɛ ani a kɔfɛ. Hali ni Meyers Singleton ye sugandili dafalen ɲuman ye, baarakɛcogo "ɲuman" laban bɛ bɔ i ka dantigɛli kɛrɛnkɛrɛnnenw de la. Ni ko kɛlenw na hali ni taamasiyɛn sɛgɛsɛgɛli musaka ka bon kojugu, Singleton min dilannen don koɲuman, n’a bilalen bɛ diɲɛ tɔgɔla-yɔrɔ la, o bɛ se ka jateminɛ, hali n’o bɛ daminɛ-sɛgɛn saraka. O kun ye ka jagokɛcogo faamuya. I n’a fɔ Mewayz bɛ modulu yɔrɔw di cogo min na, i bɛ se ka minnu labɛn walasa ka jago kɛcogo ɲuman sɔrɔ, i ka Singleton misali sugandili ka kan ka kɛ latigɛ ye min bɛ kɛ ni laɲini ye ka da i ka baarakɛminɛn ka ɲininiw kan, minnu ɲɛsinnen bɛ jiriw lakanani ma, daminɛ waati, ani doncogo caman. Ni i ye bi waleyali sugandi, min bɛ waleya ni daɲɛgafe ye, i bɛ jusigilan dɔ jɔ min barika ka bon ani min bɛ baara kɛ kosɛbɛ i n’a fɔ i b’a fɛ ka sigida minnu da.

Ɲininkali minnu bɛ kɛ tuma caman na

Singleton dafalen ɲinini : C++ gɛlɛya banbali

porozɛw dilanni cogoyaw ka yɔrɔba la, mɔgɔ damadɔ de ye sɔsɔli, kokuradonni, ani hali sɔsɔli caman lawuli i n’a fɔ Singleton. A laɲini ka nɔgɔn nanbarako la : k’a lajɛ ko kalanso dɔ ka misali kelen dɔrɔn de bɛ yen ani ka diɲɛ seleke naani sɔrɔyɔrɔ di a ma. K’a ta labɛnni sigicogo ɲɛnabɔli la ka se sɔrɔli kɔlɔsili ma nafolo jɛlen dɔ la i n’a fɔ kunnafonidilanw jɛgɛnsira, Singleton misali bɛ mago kelen ɲɛnabɔ. Nka, C++ kɔnɔ, ka Singleton sɔrɔ min bɛ se ka kɛ jirisunw ye, min bɛ baara kɛ ka ɲɛ, wa min tɛ jaan nɔgɔlenw ye, o ye taama ye kan yɛrɛ jiginni na. O ye baarakɛcogo ni dannaya ɲinini ye min bɛ hakilina jira min bɛ kɛnɛbaw kɔfɛ i n’a fɔ Mewayz, yɔrɔ min na, modulu yɔrɔ barikamaw, minnu bɛ baara kɛ ka ɲɛ, olu nafa ka bon jago baarakɛcogo sabatilen jɔli la. Waleya "ɲuman" tɛ jaabi kelen ye nka wajibiyalenw balansi don kɛrɛnkɛrɛnnenya la i ka porozɛ kɔnɔko la.

daminɛ nalonma ani farati minnu bɛ sɔrɔ caman na

Singleton waleyali min ka nɔgɔn kosɛbɛ, o bɛ baara kɛ ni baarakɛcogo jɔlen ye min bɛ misali da weleli fɔlɔ la. Nka, nin klasiki fɛɛrɛ in bɛ filiba dɔ mara diɲɛ kɔnɔ min kɔnɔna na, fɛn caman bɛ yen. Ni jirisun caman bɛ waati kelen na k’a lajɛ ni misali in bɛ yen, u bɛɛ bɛ se k’a ye ko a tɛ foyi ye, ka taa ɲɛ k’u yɛrɛ ka misaliw da, o bɛ na ni misali in sariyakolo jɔnjɔn tiɲɛni jɛlen ye. Hali n’a y’a sɔrɔ mutex lock farali dabɔli hakilina lamini na, o bɛ kunnafonidilan boli ɲɛnabɔ, o bɛ baarakɛcogo buteliba dɔ don a kɔnɔ. Weele bɛɛ min bɛ Kɛ instance-getter ma, hali ni Singleton daminɛna pewu, o bɛ na ni dakunw dabɔli ni dabɔli ye, o min tɛ mako ɲɛ, wa a musaka ka bon. O bɛ tali kɛ jagokɛcogo dɔ jɔli la, baarakɛla bɛɛ ka kan ka so dɔ konnɛgɛ ɲini waati jan da wulilen kɔfɛ kudayi, o ye waati ni nafolo tiɲɛni ye. Module sitɛmu min bɛ baara kɛ kosɛbɛ i n’a fɔ Mewayz, o baarakɛbaliya sugu la core nivo la, o tɛna sɔn.

Bi C++ ɲɛnabɔcogo : `std::call_once` ani The Magic Statics

C++11 sariyasun nana ni baarakɛminɛn barikamaw ye minnu ye Singleton waleyali ɲɛ kosɛbɛ. Fɛɛrɛ min barika ka bon kosɛbɛ ani min bɛ Lakodɔn kosɛbɛ bi, o bɛ "Magic Static" baarakɛcogo Kɛ. Ni an y’a Jira ko Singleton misali in ye fɛn ye min bɛ 'yɔrɔ la min bɛ 'yɔrɔ la baarakɛcogo 'kɔnɔ (sanni a ka Kɛ 'yɔrɔ ye min bɛ 'yɔrɔ la min bɛ Weele ko classe static), an bɛ kan ka garanti (daɲɛ) Kɛ ko 'yɔrɔ jɔlen bɛ Daminɛ cogo la min bɛ Se ka Kɛ 'sèn ye. Daɲɛgafe-bɔla bɛ dakun wajibiyalenw ɲɛnabɔ hood jukɔrɔ, nka daminɛ daminɛ waati dɔrɔn. Weele nataw bɛ teliya i n’a fɔ pointeur check nɔgɔman. Nin fɛɛrɛ in, min bɛ waleya tuma caman na ni `std::call_once` ye walasa ka kunnafoni jɛlenw di, o bɛ daminɛ lafiyalen ni baarakɛcogo ɲuman fila bɛɛ di.

ni baara kɛcogo ye fɛnba ye : The Meyers Singleton

"Magic Static" misali waleyali kɛrɛnkɛrɛnnen dɔ ka ɲi kosɛbɛ wa a bɛ nɔ bɔ fo a tɔgɔ dara a ka ntolatantɔn ŋana Scott Meyers kan. Meyers Singleton bɛ jate tuma caman na ko a ye baarakɛcogo bɛɛ lajɛlen ɲɛnabɔcogo ɲuman ye bi C++ la. A surunyalen don kosɛbɛ:

Kunnafoni : Baarakɛminɛn ɲuman sugandili

C++ Singleton baarakɛcogo "ɲuman" ɲinini bɛ laban bi misaliw la minnu bɛ se ka kɛ C++11 fɛ ani a kɔfɛ. Hali ni Meyers Singleton ye sugandili dafalen ɲuman ye, baarakɛcogo "ɲuman" laban bɛ bɔ i ka dantigɛli kɛrɛnkɛrɛnnenw de la. Ni ko kɛlenw na hali ni taamasiyɛn sɛgɛsɛgɛli musaka ka bon kojugu, Singleton min dilannen don koɲuman, n’a bilalen bɛ diɲɛ tɔgɔla-yɔrɔ la, o bɛ se ka jateminɛ, hali n’o bɛ daminɛ-sɛgɛn saraka. O kun ye ka jagokɛcogo faamuya. I n’a fɔ Mewayz bɛ modulu yɔrɔw di cogo min na, i bɛ se ka minnu labɛn walasa ka jago kɛcogo ɲuman sɔrɔ, i ka Singleton misali sugandili ka kan ka kɛ latigɛ ye min bɛ kɛ ni laɲini ye ka da i ka baarakɛminɛn ka ɲininiw kan, minnu ɲɛsinnen bɛ jiriw lakanani ma, daminɛ waati, ani doncogo caman. Ni i ye bi waleyali sugandi, min bɛ waleya ni daɲɛgafe ye, i bɛ jusigilan dɔ jɔ min barika ka bon ani min bɛ baara kɛ kosɛbɛ i n’a fɔ i b’a fɛ ka sigida minnu da.