dynamic - Is it possible to have a dynamically populating Array of char* in C++ -


i have situation this.

declare array of char*; switch(id) { case 1:     add 4 words in array case 2:     add 2 words in array default:     add 1 word in array }  use array here;

is possible such thing in c++. tried doing not working me.

yes. clean, easy-to-understand, correct, exception-safe code, use vector , string:

std::vector<std::string> v;  switch (id) { case 1:     v.push_back("a");     v.push_back("b");     v.push_back("c");     v.push_back("d");     break;  case 2:     v.push_back("a");     v.push_back("b");     break;  default:     v.push_back("a"); }  // use strings in v; example, using c++11 lambda expression: std::for_each(begin(v), end(v), [](std::string const& s) {     std::cout << s << std::endl; });  // or using loop: (std::vector<std::string>::const_iterator it(v.begin()); != v.end(); ++it) {     std::cout << *it << std::endl; }

of course, can accomplish similar results using manual dynamic allocation , cleanup of both array , c strings, , ensure code correct , exception-safe more difficult , require substantially more code.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more