大约有 47,000 项符合查询结果（耗时：0.0856秒） [XML]
C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...释放对象拥有权限、引用计数等，控制权转移等）。auto_ptr 即是一种常见的智能指针。
智能指针通常用类模板实现：
template <class T>
class smartpointer
{
private:
T *_ptr;
public:
smartpointer(T *p) : _ptr(p) //构造函数
{
}
T& oper...
AngularJS - How can I do a redirect with a full page load?
...eb server are refreshed when the page loads. window.location = "/#/Next" and window.location.href = "/#/Next" don't work, they do an Angular route which does not hit the server.
...
Is there any way to enforce typing on NSArray, NSMutableArray, etc.?
... types you wish by using macros:
MyArrayTypes.h
CUSTOM_ARRAY_INTERFACE(NSString)
CUSTOM_ARRAY_INTERFACE(User)
MyArrayTypes.m
CUSTOM_ARRAY_IMPLEMENTATION(NSString)
CUSTOM_ARRAY_IMPLEMENTATION(User)
Usage:
NSStringArray* strings = [NSStringArray array];
[strings add:@"Hello"];
NSString* str = ...
Concatenate multiple result rows of one column into one, group by another column [duplicate]
...
Simpler with the aggregate function string_agg() (Postgres 9.0 or later):
SELECT movie, string_agg(actor, ', ') AS actor_list
FROM tbl
GROUP BY 1;
The 1 in GROUP BY 1 is a positional reference and a shortcut for GROUP BY movie in this case.
string_agg() ...
Why main does not return 0 here?
... @Mr.32 : good observation, printf() returns the length of the string so it is 9 which is the "return" ofthe main (without using -std=c99).
– Hicham
Dec 30 '11 at 9:16
...
What is Haskell used for in the real world? [closed]
... to be able to
easily roll back every change if some object deep in the call
hierarchy decided the message is flawed? How about having a history of
different states?
Many housekeeping tasks made for you: deconstructing data structures (PatternMatching), storing variable bindings (LexicalScop...
What happens if you static_cast invalid value to enum class?
...ue is specified(*), and no Undefined Behaviour (UB) is involved. More generally, as you cast from the underlying type to the enumeration type, no value in data[0] can lead to UB for the static_cast.
After CWG 1766 (C++17)
See CWG defect 1766.
The [expr.static.cast]p10 paragraph has been strengthene...
How to use an existing database with an Android application [duplicate]
...trying this code, please find this line in the below code:
private static String DB_NAME ="YourDbName"; // Database name
DB_NAME here is the name of your database. It is assumed that you have a copy of the database in the assets folder, so for example, if your database name is ordersDB, then the ...
JavaScript displaying a float to 2 decimal places
...
But it returns string, not float!
– Anwar
Jun 7 '16 at 9:58
40
...
URL-parameters and logic in Django class-based views (TemplateView)
...I have above? (something about them being persistent). Also I don't understand where I'm supposed to place logic like the above, eg. in which method? Also when I do year = self.kwargs['year'] in the view I get NameError: self not defined.
– user1319936
Apr 2 '1...