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C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践new XXX(shared_from_this()) 如果用强指针去接，则增加引用计数；弱引用去接，不增加引用计数。auto去接等同强指针。weak_ptr 传给thread、timer回调，不能使用expired()判断
new XXX(shared_from_thi...
php动态安装mysql扩展错误（ext/mysqlnd/mysqlnd.h: No such file or direc...
...lnd/mysqlnd.h: No such file or directory）错误如下：In file included from data xingzheng install php-5.5.10 include php Zend zend_compile.h:719, from ...错误如下：
In file included from /data/xingzheng/install/php-5.5.10/include/php/Zend/zend_compile.h:719,
...
Multiple ModelAdmins/views for same model in Django admin
...y great! Just to add, for Django 1.4.5 I needed to inherit my custom class from admin.ModelAdmin
class MyPostAdmin(admin.ModelAdmin):
def queryset(self, request):
return self.model.objects.filter(id=1)
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Use curly braces to initialize a Set in Python
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From Python 3 documentation (the same holds for python 2.7):
Curly braces or the set() function can be used to create sets. Note:
to create an empty set you have to use set(), not {}; the latter
creates an empty dicti...
Java Synchronized Block for .class
... the other hand, can have code above and below them, that can get executed from multiple threads. They only synchronize within the block! That is not the same!
– JacksOnF1re
Mar 15 '18 at 15:31
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What is the difference between `sorted(list)` vs `list.sort()`?
...random.shuffle(lst)
"""
I interpret this larger sort's difference coming from the copying mentioned by Martijn, but it does not dominate to the point stated in the older more popular answer here, here the increase in time is only about 10%
>>> timeit.repeat("lst[:].sort()", setup=setup, ...
How do I start a program with arguments when debugging?
...io 2008. The problem is that it exits if it doesn't get arguments. This is from the main method:
5 Answers
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Requests — how to tell if you're getting a 404
I'm using the Requests library and accessing a website to gather data from it with the following code:
1 Answer
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What is purpose of the property “private” in package.json?
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Taken from this site, https://docs.npmjs.com/files/package.json#private
private
If you set "private": true in your package.json, then npm will refuse to publish it.
This is a way to prevent accidental publication of private reposi...
Importing a Swift protocol in Objective-C class
...known to the compiler.
This is also described in the section "Using Swift from Objective-C" in the Apple Docs
Note that XCode will give a warning in the objC header file when you use the forward declared protocol ("Cannot find protocol definition for 'AnalyticProtocol'), but this is can be ignore...