C++ - pointer array to Vector? -

- 

  डबल * मान; // इसके बजाय, std :: vector & lt; डबल & gt; मूल्यों; // मैं यह चाहता हूँ।   
 मैं जिस एपीआई का उपयोग कर रहा हूं वह परिणाम को  डबल *  सूचक के रूप में प्रदान करता है मैं  std :: vector & lt; double & gt;  
 
 < P> आप एक वेक्टर  जगह  में एक सरणी लपेट नहीं सकते हैं और वेक्टर को उस सरणी पर काम करने की उम्मीद कर सकते हैं। सबसे अच्छा आप ऐसा कर सकते हैं वेक्टर को  डबल *  और मूल्यों की संख्या दे, जिसमें वेक्टर प्रत्येक तत्व की एक प्रति बनायेगा और इसे अपने आप में डाल देगा:  
 < कोड> इंट arrlen = 0; // my_api का नाटक संदर्भ से arrlen लेता है और इसे सरणी की लंबाई के लिए सेट करता है डबल * dbl_ptr = my_api (arrlen); वेक्टर के & lt; डबल & gt; मान (dbl_ptr, dbl_ptr + arrlen); // ध्यान दें कि मान * * नहीं है * उसी स्मृति का उपयोग कर dbl_ptr // इसलिए हालांकि मूल्य [0] == dbl_ptr [0], और मान [0]! = & Amp; dbl_ptr [0]   
 और भी, जैसे प्राटोोरियन ने कहा, अगर आप उपयोग कर रहे एपीआई का उपयोग करने के बाद आप स्मृति को मुक्त करने की उम्मीद कर रहे हैं, तो आपको स्मार्ट पॉइंटर्स में रुचि हो सकती है। देखें।

Comments

Post a Comment

Popular posts from this blog

php - Creating canonical URLs with custom route-classes -

-
I am trying to implement the canonical url and to combine with custom route classes. URL-SACAME is something like this: / category-x / article / 123 / category-y / article / 123 I am creating a custom route - the expansion of the class Zend_Controller_Router_Route_Regex and checks that the article is 123 and the correct category-name is included in the URL. If the article is in 123 square-X and the user is reaching square-y, then I want to redirect to the correct URL. But there is no clear possibility to do this directly to the roads. What is the best practice approach here? I often do this in my action controller like something ... // Get / Category-Y / Article / 123 $ $ article- & gt; URL is generated, and it contains / category-x / article / 123 if (this-> --request-> getRequestUri ()! = $ Article-> URL) {return $ this- & gt; ; _helper-> Redirector-> GoToUrl ($ paragraph-> url); } In this example, $ article-> The url will need ...
Read more

Mysql Local server hardware -

-
In anticipation of a live scenario, I am creating my entire site, which has a 500 MHz processor with 256 MB A very large 100 MHz RAM I have loaded my database with 200k + rows of garbage data, trying to test my queries. I have seen - obviously because of this, a large display hit all my FAQ using the index, although some 15+ to join (using all indexes) using MySQL To enable 16MB cache, which brings down the query times to nothing but what results? With a dynamic website, I can not see how the cache can help completely when I allow unique queries such as a search feature. I am also using the eaccelerator for PHP. When I use the COUNT (*) total with multiple code JOIN and WHERE , then 10 + There are other queries. Other queries that only get the same line or two do at the same level when I had only a few lines I also noticed that almost 99% of the CPU in CPU CPU stress during a query Comes. Basically I do not know whether the software is on the fault or too much of the h...
Read more

mysql - Formatting problem with PHP DateTime Difference when used as part of an equation -

-
I am trying to write a simple invoicing system. I want to use the Datetime Diff to calculate the cost of each invoice. I have so far: / * In this example $ dayLength and $ ratePerSec is not really the case, but now we use the hypotethical values ​​of 8.0 and 0.0054 Will * / $ date1 = new date time ("Time 1 Form Database", [DateTimeJonof Chase]); $ Date2 = new date time ("Time 2 Form Database", [Datetime Joneof Choice]); $ Diff = $ date2- & gt; Diff ($ date1); $ LenInSec = $ diff- & gt; Format ("% y") * 365 * $ dayLength * 3600 + $ diff- & gt; Format ("% d") * $ dayLength * 3600 + $ diff- & gt; Format ("% H") * 3600 + $ diff- & gt; Format ("% i") * 60 + $ diff- & gt; Format ("% s"); $ Cost = $ lenInSec * $ rate per second; When I try to output cost using $ lenInSec generated from the Deltaime Diff, I actually get weird results. Occasionally, in 1 and 3 out of 1 to 3 times, I get the...
Read more