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Difference between string and char[] types in C++
...
A char array is just that - an array of characters:
If allocated on the stack (like in your example), it will always occupy eg. 256 bytes no matter how long the text it contains is
If allocated on the heap (using malloc() or new char[]) you're responsible for releasing the memory...
Converting NSString to NSDate (and back again)
...String = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:dateString];
NSDate convert to NSString:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[d...
“Application tried to present modally an active controller”?
...trollers instantiated like so:
UIViewController* vc1 = [[UIViewController alloc] init];
UIViewController* vc2 = [[UIViewController alloc] init];
UIViewController* vc3 = [[UIViewController alloc] init];
You have added them to a tab bar like this:
UITabBarController* tabBarController = [[UITabBarC...
How to remove empty cells in UITableView? [duplicate]
...FooterView = UIView()
Objective-C:
tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
Because the table thinks there is a footer to show, it doesn't display any cells beyond those you explicitly asked for.
Interface builder pro-tip:
If you are using a xib/Storyboard, you c...
In C, do braces act as a stack frame?
...[0] here? */
return;
}
(In other words: is the compiler allowed to deallocate d, even if in practice most don't?).
The answer is that the compiler is allowed to deallocate d, and accessing p[0] where the comment indicates is undefined behaviour (the program is not allowed to access the inner ...
Apache Spark: The number of cores vs. the number of executors
...ably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allocating 100%
of the resources to YARN containers because the node needs some
resources to run the OS and Hadoop daemons. In this case, we leave a
gigabyte and a core for these system processes. Cloudera Manager helps
by ac...
Efficient string concatenation in C++
...e a look at this interface:
template <class charT, class traits, class Alloc>
basic_string<charT, traits, Alloc>
operator+(const basic_string<charT, traits, Alloc>& s1,
const basic_string<charT, traits, Alloc>& s2)
You can see that a new object is returne...
What killed my process and why?
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I just wrote a program that malloc'd memory in an inifite loop. After the system got slow, "Killed" was displayed in the terminal and the process was terminated. The file /var/log/kern.log contained a lot of info about the termination. -Thanks for the...
convert a char* to std::string
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@Madhatter it is a deep copy. The pointer allocation will remain, and the string will make itself a new allocation.
– moodboom
Dec 1 '17 at 12:43
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Java maximum memory on Windows XP
I've always been able to allocate 1400 megabytes for Java SE running on 32-bit Windows XP (Java 1.4, 1.5 and 1.6).
13 Answe...