大约有 32,000 项符合查询结果（耗时：0.0910秒） [XML]
Is Meyers' implementation of the Singleton pattern thread safe?
...is requested, a lock is taken, the Singleton is created if it needs to be, then the lock is released and the Singleton reference returned.
#include <windows.h>
class CritSection : public CRITICAL_SECTION
{
public:
CritSection() {
InitializeCriticalSection( this);
}
~Crit...
Multiple returns from a function
... the accepted answer" Maybe three people have to agree with that tag, and then it becomes featured. :)
– ToolmakerSteve
Apr 4 '19 at 18:31
...
Caching a jquery ajax response in javascript/browser
...ou have to do is after receiving the response store it to browser storage. Then next time you find the same call, search if the response is saved already. If yes, return the response from there; if not make a fresh call.
Smartjax plugin also does similar things; but as your requirement is just savi...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...84,980,673,984,909,570,977,377,882,585,701
Exponent: 65,537
The question then becomes how do we want to store these numbers in a computer. First we convert both to hexadecimal:
Modulus: EB506399F5C612F5A67A09C1192B92FAB53DB28520D859CE0EF6B7D83D40AA1C1DCE2C0720D15A0F531595CAD81BA5D129F91CC6769719...
Regular expression for letters, numbers and - _
...e regex also matches the empty string. If you need at least one character, then use + (one-or-more) instead of * (zero-or-more) for repetition.
In any case, you can further clarify your specification (always helps when asking regex question), but hopefully you can also learn how to write the patter...
Go build: “Cannot find package” (even though GOPATH is set)
...e "widget" the go command looks for src/pkg/widget inside the Go root, and then—if the package source isn't found there—it searches for src/widget inside each workspace in order.
(a "workspace" is a path entry in your GOPATH: that variable can reference multiple paths for your 'src, bin, pkg' t...
Rails I18n validation deprecation warning
...nternal object, loads the dependencies (Railties and third party gems) and then it passes the configuration to the target classes. If you use a gem (or Rails plugin) that calls any of the I18n methods before the config is assigned to I18n, then you'll get the warning.
In this case, you need to skip...
How to create a custom-shaped bitmap marker with Android map API v2 [duplicate]
...d sir when we get the latitude , longitude and url form the web service , then how to convert the url into bitmap in it so fast
– Rishi Gautam
Apr 26 '13 at 10:13
...
How to conditionally push an item in an observable array?
... reference to the same object and you want to run custom comparison logic, then you can use ko.utils.arrayFirst like:
var match = ko.utils.arrayFirst(myObservableArray(), function(item) {
return itemToAdd.id === item.id;
});
if (!match) {
myObservableArray.push(itemToAdd);
}
...
Accessing dict_keys element by index in Python3
...nswer but perhaps a useful hint. If it is really the first item you want*, then
next(iter(q))
is much faster than
list(q)[0]
for large dicts, since the whole thing doesn't have to be stored in memory.
For 10.000.000 items I found it to be almost 40.000 times faster.
*The first item in case...