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Why should casting be avoided? [closed]
...nd the answers are really quite different between the three. Discussion of C++ more or less implies discussion of C casts as well, and that gives (more or less) a fourth answer.
Since it's the one you didn't mention explicitly, I'll start with C. C casts have a number of problems. One is that they ...
App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
...问
AI2 能否实现类似 uni-push 的后台推送通知？手机开机不打开 App 就能自动读取云端数据。
以下是源码级深度调研结果。
一、推送通知的工作原理
系统级推送（真推送）
服务器 -> FCM/APNs 云端 -> 手机操作系统...
Windows threading: _beginthread vs _beginthreadex vs CreateThread C++
... make the C runtime library usable & consistent in the new thread.
In C++ you should almost certainly use _beginthreadex() unless you won't be linking to the C runtime library at all (aka MSVCRT*.dll/.lib).
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Read whole ASCII file into C++ std::string [duplicate]
I need to read a whole file into memory and place it in a C++ std::string .
9 Answers
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How do I create and access the global variables in Groovy?
...otglobal=100 // This will not be accessible inside the function
iamglobal=200 // this is global and will be even available inside the
def func()
{
log.info "My value is 200. Here you see " + iamglobal
iamglobal=400
//log.info "if you uncomment me you will get error. Since iamnotglobal...
How do I disable the security certificate check in Python requests
...;> requests.get('https://kennethreitz.com', verify=False)
<Response [200]>
If you're using a third-party module and want to disable the checks, here's a context manager that monkey patches requests and changes it so that verify=False is the default and suppresses the warning.
import war...
How can I center a div within another div? [duplicate]
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You can center float div with this little code:
#div {
width: 200px;
height: 200px;
position: absolute;
left: 50%;
top: 50%;
margin-top: -100px;
margin-left: -100px;
}
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Is there a way to instantiate objects from a string holding their class name?
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Nope, there is none, unless you do the mapping yourself. C++ has no mechanism to create objects whose types are determined at runtime. You can use a map to do that mapping yourself, though:
template<typename T> Base * createInstance() { return new T; }
typedef std::map<s...
Function overloading by return type?
...m, and that makes this task as natural for the human reader as possible."
C++ (subsection 7.4.1of Bjarne Stroustrup's "The C++ Programming Language"): "Return types are not considered in overload resolution. The reason is to keep resolution for an individual operator or function call context-indep...
C++ Double Address Operator? (&&)
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This is C++11 code. In C++11, the && token can be used to mean an "rvalue reference".
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