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What do the plus and minus signs mean in Objective-C next to a method?
...se?
[CustomClass classMethod];
CustomClass *classObject = [[CustomClass alloc] init];
[classObject instanceMethod];
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Shards and replicas in Elasticsearch
...search performance and for fail-over. A replica shard is never going to be allocated on the same node where the related primary is (it would pretty much be like putting a backup on the same disk as the original data).
Back to our example, with 1 replica we'll have the whole index on each node, sinc...
Why was “Avoid Enums Where You Only Need Ints” removed from Android's performance tips?
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TLDR: Dalvik was not good with memory allocation and Enum uses more memory than int. Android Lollipop replaced Dalvik with ART which does not suffer from the same limitations. Thus this recommendation is not relevant anymore.
The long answer:
Wow! 8 years, 5 a...
Creating an object: with or without `new` [duplicate]
...e the object creation occurs at runtime. (I won't go into the specifics of allocating dynamic arrays here.)
Neither is preferred; it depends on what you're doing as to which is most appropriate.
Use the former unless you need to use the latter.
Your C++ book should cover this pretty well. If you...
How do I declare and initialize an array in Java?
...turning it to the caller, it is no longer valid. Using the new keyword you allocate the new object from the heap and it is valid outside the defining scope.
– teukkam
Oct 18 '16 at 9:55
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UIRefreshControl without UITableViewController
...gically just works!
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
[self.myTableView addSubview:refreshControl];
This adds a UIRefreshControl above your table view an...
Array versus linked-list
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@Rick, vectors typically overallocate the space they require so that they don't need to allocate new space everytime the size increases. The result is that vectors are typically much less memory intensive, not more then linked lists.
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Best practices for Storyboard login screen, handling clearing of data upon logout
...oller"];
UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];
self.window.rootViewController = navigation;
}
In SignUpViewController.m file
- (IBAction)actionSignup:(id)sender
{
AppDelegate *appDelegateTemp = [[UIApplication...
Using arrays or std::vectors in C++, what's the performance gap?
...rator is the same damn thing as
// incrementing a pointer.
Note: If you allocate arrays with new and allocate non-class objects (like plain int) or classes without a user defined constructor and you don't want to have your elements initialized initially, using new-allocated arrays can have perfor...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是达到抛砖引玉的作用。
2-3-5 使用Memory监测及GC打印与Allocation Tracker进行UI卡顿分析
关于Android的内存管理机制下面的一节会详细介绍，这里我们主要针对GC导致的UI卡顿问题进行详细说明。
Android系统会依据内存中不同的内存...