c++ - How can I iterate over two vectors simultaneously using BOOST_FOREACH? -

-

मैं निम्न को बूस्ट FOREACH के साथ दोहराना चाहूंगा 

  std :: vector & lt; Int> gt; :: const_iterator i1; Std :: vector & lt; int & gt; :: const_iterator i2; के लिए (i1 = v1.begin (), i2 = v2.begin (); i1 और lt; v1.end () और amp; i2 और lt; v2.end (); ++ i1, ++ i2) {doSomething ( * I1, * i2); }    
 
 
 एक साथ दो चीजों को दोबारा बदलना एक "ज़िप" कहा जाता है (कार्यात्मक प्रोग्रामिंग से) , और:  
 
 ज़िप इटरेटर एक साथ कई नियंत्रित दृश्यों को समानांतर-पुनरावृत्त करने की क्षमता प्रदान करता है। एक ज़िप iterator इटरेटर के एक ट्यूपल से बनाया गया है। ज़िप इटरेटर चलते हुए समानांतर में सभी iterators को स्थानांतरित करता है। ज़िप इटरेटर के संदर्भ में एक ट्यूपल देता है जिसमें अलग-अलग इरेटरर्स को डीरेंसिंग के परिणाम शामिल हैं।   
 ध्यान दें कि यह एक इरेरेटर है, एक श्रेणी नहीं है, इसलिए  BOOST_FOREACH  का उपयोग करने के लिए फिर से उनमें से दो सामान को एक या  जोड़ी  में रख सकते हैं तो यह बहुत अच्छा नहीं होगा, लेकिन कुछ सावधानी के साथ आप शायद एक सरल  zip_range  लिखकर लिख सकते हैं:  
  BOOST_FOREACH (boost :: tuple & lt; Int, int & gt; और amp; p, zip_range (v1, v2)) {doSomething (p.get & lt; 0 & gt; (), p.get & lt; 1 & gt; ()); }   
 या 2 के लिए विशेष-मामले और  std :: pair  के बजाय  boost :: tuple  का उपयोग करें।  < पी> मुझे लगता है कि  doSomething  के पैरामीटर  (int & amp ;, int & amp;)  हो सकता है, वास्तव में हम एक  tuple & lt; int & amp;; int & amp; & gt; । आशा है कि यह काम करता है।

Comments

Post a Comment

Popular posts from this blog

mysql - BLOB/TEXT column 'value' used in key specification without a key length -

-
I have developed an extension which works up to 1.6 on Magren (I'm trying Enterprise Edition, And I think the community is the same problem, because it is the same code). In my install script, I see the $ installer-> gt; CreateEntityTables ($ this- & gt; getTable ('alphanum / info')); The installation is done until it is not in the _text unit table. It crashed there! It turns out that when I log in to SQL and run it via PHPmyadmin, then this error is: Blob / Text column 'value' is used without the key 'key' . I saw the code there, and this is what is trying to create an index on the value column: -> addIndex ($ this- & gt; getIdxName ($ eavTableName, array ( 'attribute_id array (' attribute_id ',' value ')) - & gt; addIndex ($ this- & gt; getIdxName ($ eavTableName, array (' entity_type_id ' , 'Value')), array ('entity_type_id', 'value')) If there is no if statement is n...
Read more

c# - Using Vici cool Storage with monodroid -

-
Oh, for the moment I am not sure how it is officially supported, but for the success of the people Using Monodroid Vic Cool Storage I am able to leave and compile assemblies in my project, but while trying to use some classes, the errors of time have to be gathered. Especially when trying to connect like the example for Mono Touch string dbName = path. Cobain (environment. Gatefolder path (environment specialfolder personal), "mydb.db3"); // The following line will be called coolestation, where is the database, // to make it if it does not exist, and call a delegate that creates the necessary tables (only when the database file was newly created //) CSConfig.SetDB (DbName, true, () => {CSDatabase.ExecuteNonQuery ("Subscriber Integer Primary Key Attribute, Name Text (50) No, Number, Date First Text (30)");); There is no difference when I try to use the methods of CSConfig and when I cscfif If I try to pass 3 aggregates to STDB (3) then I get the invalid ...
Read more

python - referencing a variable in another function? -

-
I am an experienced TCL developer and write my own processes to help myself. I call it a proc i callVar, print out the value of the variable in a certain format, so I know that it is variable and what is the value "set foo 1; putVar foo" result 'foo = "1" I want to do the same thing in Python, but I can not find the answer :( In TCL I use the up command because when I pass the name of the variable, then I can see the value at the top. . I understand that an advanced light in the dragon There is no mechanism of r, but with its introspection capability, I would think that this is something trivial, but I am not getting the answer anywhere. It seems that this should work: and expanded: def foo (): y = "Hello World" printwor ("y") foo () y = "Hello World " You can, but you should not do so if your code is correct If is needed , then there is something wrong with your design, and you should probably use the dictionar...
Read more