What is the difference between these two uses of const in C++? -

-

संभव डुप्लिकेट:

बीच में अंतर क्या है 

  एक const * pa2 = pa1;

और

<पूर्व> A * const pa2 = pa1;

(मेरे पास उदाहरण के लिए कुछ वर्ग ए है)।

दाएं से बाएं टाइप करें: 

  एक const * pa2 = pa1;

pa2 केवल पढ़ने के लिए एक सूचक है (ऑब्जेक्ट को संकेतक के माध्यम से बदला नहीं जा सकता है) 

  ए * कॉन्स्ट पे 2 = पे 1;

pa2 ए के लिए केवल पढ़ने के लिए पॉइंटर है (सूचक को बदला नहीं जा सकता है)

इसका अर्थ यह नहीं है कि कोई भी बदल नहीं सकता है (या वास्तव में निरंतर) const भ्रामक है, इसे केवल पढ़ने के लिए ही समझें। अन्य एलाइज़ेड पॉइंटर्स ए।

संशोधित हो सकते हैं

Comments

Post a Comment

Popular posts from this blog

windows - Heroku throws SQLITE3 Read only exception -

-
After I deploy the app to Heroku, I have to run migration scripts and get this error message ... ITES \ padrino \ prophetmargin & gt; Heroku Rack AR: Rack mutated! SQLite3 :: ReadOnlyException: only one try to write database to read: CREATE TABLE "schema_migrations" ( "version" varchar (255) NOT NULL) /disk1/home/slugs/215264_925fd2c_65a3/mnt/.bundle/gems/gems/ padrino-core- is 0.9.11 / lib / padrino-core / cli / rake.rb: 9: in `init ' how can this be? I also tried to run Heroku dbpush SQLite: //db/my-db.db and that did not work Horoku sqlite3 but using postgres does not do. I'm not sure why you are receiving this error, however, as I have used sqlite3 in development and when pushing it into its travel, they do some magic which migrates to postgrads. I'm absolutely sure how Heroku does 'backwash' this database but it seems that this is happening to you because it's the SQLite db file which is obviously due to Heroku's...
Read more

php - Login to icq account to receive messages from contact #12345678 -

-
What's the way php-script is running, which does the following: - Enter the icq-account - Received Existing contacts are all messages (if any) from # 12345678 and - write those messages in an array such as $ Messages = array (); Edit I like to answer: "Blaee" is a good, active community, it is often updated because ICQ changes its internal changes Let's see: The first result of that: This class can be used to communicate with other ICQ consumers. This can: Non-interception with an ICQ server Authenticate as a given user Get offline message Send and receive messages (...) I would say that code Looking for you.
Read more

python - rename keys in a dictionary -

-
I want to change the names of keys in a dictionary which are ints, and I need them so that the inputs with key zero They can sort correctly. For example, my keys are like this: '1', '101', '11' and I may need them: '001', '101', '011' What is doing, but I know that there is a better way tmpDict = {} in the ADC for the old: t MpDict ['% 04d'% int (olden)] = addict [oldkey] New controlled = tmpDict You are going wrong about this if you want to draw entries on a line in a specific way, then you have to sort on the extraction. for sorted (D, key = int): print '% s:% R'% (k, d [k])
Read more