大约有 40,700 项符合查询结果（耗时：0.0374秒） [XML]
What does Serializable mean?
...
Serialization is persisting an object from memory to a sequence of bits, for instance for saving onto the disk. Deserialization is the opposite - reading data from the disk to hydrate/create an object.
In the context of your question, it ...
What are copy elision and return value optimization?
What is copy elision? What is (named) return value optimization? What do they imply?
4 Answers
...
Is there any use for unique_ptr with array?
...with allocators. Some people need a dynamically sized array, so std::array is out. And some people get their arrays from other code that is known to return an array; and that code isn't going to be rewritten to return a vector or something.
By allowing unique_ptr<T[]>, you service those needs...
What are the differences between “generic” types in C++ and Java?
...+ provides a very strong programming model with template s.
So then, what is the difference between C++ and Java generics?
...
How do short URLs services work?
...] web page which merely provide an "HTTP redirect" to the original URL? or is there more "magic" to it ?
4 Answers
...
How to initialize an array's length in JavaScript?
...
Why do you want to initialize the length? Theoretically there is no need for this. It can even result in confusing behavior, because all tests that use the length to find out whether an array is empty or not will report that the array is not empty.
Some tests show that setting the initi...
Why all the Active Record hate? [closed]
...Rails' ActiveRecord, I'll try address all the complaints which have been raised in context of using it.
@BlaM
The problem that I see with Active Records is, that it's always just about one table
Code:
class Person
belongs_to :company
end
people = Person.find(:all, :include => :com...
How to use git bisect?
I have read some articles saying that git bisect is awesome. However, I'm not a native speaker and I can't understand why it's awesome.
...
Django datetime issues (default=datetime.now())
...
it looks like datetime.now() is being evaluated when the model is defined, and not each time you add a record.
Django has a feature to accomplish what you are trying to do already:
date = models.DateTimeField(auto_now_add=True, blank=True)
or
date =...
Coalesce function for PHP?
...
There is a new operator in php 5.3 which does this: ?:
// A
echo 'A' ?: 'B';
// B
echo '' ?: 'B';
// B
echo false ?: 'B';
// B
echo null ?: 'B';
Source: http://www.php.net/ChangeLog-5.php#5.3.0
...