大约有 40,000 项符合查询结果（耗时：0.0544秒） [XML]
C++ lambda with captures as a function pointer
...r me and other people I made some improvement.
Standard function C pointer api uses void fn(void* data) convention. By default this convention is used and lambda should be declared with a void* argument.
Improved implementation
struct Lambda {
template<typename Tret, typename T>
static...
What is a NullPointerException, and how do I fix it?
...
When you declare a reference variable (i.e. an object) you are really creating a pointer to an object. Consider the following code where you declare a variable of primitive type int:
int x;
x = 10;
In this example, the variable x is an int and Java will initialize it to 0 for you. When yo...
What is the Swift equivalent of respondsToSelector?
...gers warnings for performSelector:).
However, when checking for available APIs, you can still use respondsToSelector:, even if Swift, if you are dealing with NSObject instances:
@interface TestA : NSObject
- (void)someMethod;
@end
@implementation TestA
//this triggers a warning
@end
va...
Android Center text on canvas
... use r.bottom instead.
I have had some problems with Canvas.getHeight() if API < 16. That's why I use Canvas.getClipBounds(Rect) instead. (Do not use Canvas.getClipBounds().getHeight() as it allocates memory for a Rect.)
For reasons of performance, you should allocate objects before they are used...
How to get the browser to navigate to URL in JavaScript [duplicate]
...
This works in all browsers:
window.location.href = '...';
If you wanted to change the page without it reflecting in the browser back history, you can do:
window.location.replace('...');
...
What is a Windows Handle?
...ing) a handle is an abstraction which hides a real memory address from the API user, allowing the system to reorganize physical memory transparently to the program. Resolving a handle into a pointer locks the memory, and releasing the handle invalidates the pointer. In this case think of it as an ...
How to get rid of `deprecated conversion from string constant to ‘char*’` warnings in GCC?
...
THIS IS HORRIBLY BAD PRACTICE, and I'm sad it got all those votes. Warnings are not there so that you ignore them. Warnings are there telling you "dude, you're doing something that could be wrong, be careful", and you should only suppress them when you wanna respond like "sh...
Remove URL parameters without refreshing page
...L, add/insert/push the new URL to history entries, and make it current URL
allowing users to bookmark the page with the same parameters (to show the same contents)
to programmatically access the data through the stateObj then parse from the anchor
As I understood from your comment, you want to c...
What is the best way to tell if a character is a letter or number in Java without using regexes?
...racter-sets and or display fonts mixed up. Unicode codepoint u00ff is actually the character ÿ. (Lower-case y with an umlaut.) The codepoint that represents ├ is u251c.
– Stephen C
Jun 1 at 11:56
...
Downloading all maven dependencies to a directory NOT in repository?
...ted in binary form over maven only, but after banging my head against the wall on it for far too long I've decided to stop hurting myself and just use Ant. I'd like to just have maven download the jar and all of its transitive dependencies into a directory of my choosing so I can just check them in...