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How do I check if a variable exists?
...is condition to be true even if myVar is an empty list, zero, empty string etc.
– Gabriel
Jul 27 '18 at 18:09
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Function in JavaScript that can be called only once
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Reusable invalidate function which works with setInterval etc,.: jsbin.com/vicipar/1/edit?js,console
– Q20
Apr 27 '17 at 23:41
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Python Infinity - Any caveats?
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A simple float addition, multiplication, etc will happily produce inf though: f=1.3407807929942597e+154; f*f => inf. It seems rather an exception of ** to raise an OverflowError.
– eregon
Jan 6 '15 at 21:32
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How to create NS_OPTIONS-style bitmask enumerations in Swift?
...om array literal syntax, queries like contains, masking with intersection, etc. (No more having to remember which funny character to use for which membership test!)
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What is the difference between shallow copy, deepcopy and normal assignment operation?
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In python, when we assign objects like list, tuples, dict, etc to another object usually with a ' = ' sign, python creates copy’s by reference. That is, let’s say we have a list of list like this :
list1 = [ [ 'a' , 'b' , 'c' ] , [ 'd' , 'e' , 'f' ] ]
and we assign another li...
How to get folder path for ClickOnce application
...ending on publishing settings (Checking for updates, version requirements, etc).
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map vs. hash_map in C++
...of O(N) when collisions are likely (bad hash fcn, loading factor too high, etc)
– KitsuneYMG
Feb 3 '10 at 6:25
A good ...
mfc从CImageList中获取CBitmap位图对象 - C/C++ - 清泛网 - 专注C/C++及内核技术
mfc从CImageList中获取CBitmap位图对象通过图像的索引号从CImageList中获取CBitmap位图对象的函数如下： CImageList中获取CBitmap位图对象void GetListImage(CImageList &Imag...通过位图的索引号从CImageList中获取CBitmap位图对象的函数如下：
//CImageL...
Linux将一个程序变成后台进程转入后台运行 - C/C++ - 清泛网 - 专注C/C++及内核技术
...程转入后台运行问题现象：Linux下写了一个无限循环处理的程序（类似Linux守护进程），不过当我们. xxx运行程序时，由于程序没有退出，终端被阻塞无法继续...问题现象：
Linux下写了一个无限循环处理的程序（类似Linux守护进程...
AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ory space.
测试任何内存地址,以确保它是完全包含在程序的内存空间。
BOOL AfxIsValidAddress(
const void* lp,
UINT nBytes,
BOOL bReadWrite = TRUE
);
Parameters
lp
Points to the memory address to be tested.
指向被测试...