大约有 47,000 项符合查询结果（耗时：0.0551秒） [XML]
C++ unordered_map using a custom class type as the key
...h values. For example, assuming a key-type like this:
struct Key
{
std::string first;
std::string second;
int third;
bool operator==(const Key &other) const
{ return (first == other.first
&& second == other.second
&& third == other.thir...
Why does Python use 'magic methods'?
...lable, an object implements a method, def __len__(self) , and then it is called when you write len(obj) .
7 Answers
...
Chrome desktop notification example [closed]
...
@StepanYakovenko Try the codepen link again. I added an extra else at the end to tell you what the problem is. You probably globally disabled notifications like me :\
– mpen
Mar 20 '19 at 0:45
...
Serializing PHP object to JSON
...ertyGetters = array();
/**
* @param mixed $object
* @return string|false
*/
public function serialize($object)
{
return json_encode($this->serializeInternal($object));
}
/**
* @param $object
* @return array
*/
private function serial...
How to modify a specified commit?
...@SudipBhandari That's the feeling I get. I didn't force, and now I have an extra branch, mirroring all the commits back to the one whose message I changed, which is super-ugly.
– ruffin
Feb 5 '18 at 16:35
...
How do I create a PDO parameterized query with a LIKE statement?
...e you did "select * from table where column like ?;" and set the parameter string so: string frag = $"%{searchFragment}%"; then use frag for the parameter value. Weird
– sdjuan
Nov 8 '16 at 19:34
...
HTML text input field with currency symbol
...th content: '$' on inputs and adding an absolutely positioned element adds extra html - I like do to a background SVG inline css.
It goes something like this:
input {
width: 85px;
background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' heigh...
Java: How to test methods that call System.exit()?
...se of ExpectedSystemRule is nice, of course; the problem is it requires an extra 3rd-party library which provides very little in terms of real-world usefulness, and is JUnit-specific.
– Rogério
Oct 22 '15 at 16:15
...
Xcode 4: How do you view the console?
...
The console is no extra window anymore but it is under the texteditor area. You can set the preferences to always show this area. Go to "General" "Run Start" and activate "Show Debugger". Under "Run completes" the Debugger is set to hide again...
Is there any advantage of using map over unordered_map in case of trivial keys?
...(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got no problems with the definition of the hash function. The more I thought about it, the more I came to realize that I can't find any reason of using a std::map over a std::unordered_...