大约有 40,700 项符合查询结果（耗时：0.0506秒） [XML]
What is the difference between Caching and Memoization?
...ike to know what the actual difference between caching and memoization is.
As I see it, both involve avoiding repeated function calls to get data by storing it .
...
How does std::move() transfer values into RValues?
...t;::type&&>(arg);
}
Let's start with the easier part - that is, when the function is called with rvalue:
Object a = std::move(Object());
// Object() is temporary, which is prvalue
and our move template gets instantiated as follows:
// move with [T = Object]:
remove_reference<Ob...
mysqli or PDO - what are the pros and cons? [closed]
...ents and transaction support. Some projects use one, some the other. There is little realistic likelihood of us ever moving to another RDBMS.
...
bundler vs RVM vs gems vs RubyGems vs gemsets vs system ruby [closed]
...
As per the previous answer, this is quite a lot to cover, so consider this a short introduction.
gems are the way Ruby libraries are packaged. They are to Ruby what jars are to Java. Inside a gem file, you find Ruby code (.rb files), but also tests, and ...
Passing parameters to a Bash function
...ing to search how to pass parameters in a Bash function, but what comes up is always how to pass parameter from the command line.
...
Is string in array?
...be the best way to look in a string[] to see if it contains a element. This was my first shot at it. But perhaps there is something that I am overlooking. The array size will be no larger than 200 elements.
...
What is the string concatenation operator in Oracle?
What is the string concatenation operator in Oracle SQL?
5 Answers
5
...
Unexpected results when working with very big integers on interpreted languages
...
Python's int auto promotes to a Python long which supports arbitrary precision. It will produce the correct answer on 32 or 64 bit platforms.
This can be seen by raising 2 to a power far greater than the bit width of the platform:
>>> 2**99
633825300114114700748351602688L
You can dem...
Count table rows
What is the MySQL command to retrieve the count of records in a table?
11 Answers
11
...
What are sessions? How do they work?
...
Because HTTP is stateless, in order to associate a request to any other request, you need a way to store user data between HTTP requests.
Cookies or URL parameters ( for ex. like http://example.com/myPage?asd=lol&boo=no ) are both ...