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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...
Programmatically add custom event in the iPhone Calendar
... {
[super viewDidLoad];
EKEventStore *eventStore = [[EKEventStore alloc] init];
EKEvent *event = [EKEvent eventWithEventStore:eventStore];
event.title = @"EVENT TITLE";
event.startDate = [[NSDate alloc] init];
event.endDate = [[NSDate alloc] initWithTimeInterval:600...
How do I concatenate two strings in C?
....h>
char* concat(const char *s1, const char *s2)
{
char *result = malloc(strlen(s1) + strlen(s2) + 1); // +1 for the null-terminator
// in real code you would check for errors in malloc here
strcpy(result, s1);
strcat(result, s2);
return result;
}
This is not the fastest wa...
Differences between std::make_unique and std::unique_ptr with new
...untime efficiency the way using make_shared does (due to avoiding a second allocation, at the cost of potentially higher peak memory usage).
* It is expected that C++17 will include a rule change that means that this is no longer unsafe. See C++ committee papers P0400R0 and P0145R3.
...
How do I clear the std::queue efficiently?
...uivalent. Since there is no transfer of ownership in the assignment of the allocated memory some containers (like vector) might just call the destructors of the previously held elements and set the size (or equivalent operation with the stored pointers) without actually releasing the memory.
...
Quickly create large file on a Windows system
...oftware/rdfc/index-en.html
RDFC is probably not the fastest, but it does allocate data blocks. The absolutely fastest would have to use lower level API to just obtain cluster chains and put them into MFT without writing data.
Beware that there's no silver bullet here - if "creation" returns insta...
Is there a best practice for generating html with javascript
...nce seen in the first method is likely because the result string must be reallocated 200 times, and memory allocations can be slow. After two iterations you have "testingtesting". After three iterations, that string is thrown away and memory with enough room for "testingtestingtesting" is allocate...
What is the memory consumption of an object in Java?
... tell you, so long as the program gives the same answers.
It might allocate some temporary Objects on the stack.
It may optimize some variables or method calls totally out of existence replacing them with constants.
It might version methods or loops, i.e. compile two versions of a meth...
Take a char input from the Scanner
...er("") to set the delimiter to an empty string. This will cause next() to tokenize into strings that are exactly one character long. So then you can repeatedly call next().charAt(0) to iterate the characters. You can then set the delimiter to its original value and resume scanning in the normal w...
Can I force a UITableView to hide the separator between empty cells? [duplicate]
...ra separators from tableview
self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
}
For previous versions
You could add this to your TableViewController (this will work for any number of sections):
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:...