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Why can't decimal numbers be represented exactly in binary?
...ough there are an infinite amount of them, we could "count out" all of the items in the sequence, without skipping any. That means if we want to get the item in the 610000000000000th position in the list, we can figure it out via a formula.
However, real numbers are uncountably infinite. You c...
Clojure differences between Ref, Var, Agent, Atom, with examples
...nctions that start with def like defn.
Use an atom when you have a single item that changes. An example might be a counter or a vector that you want to add items to.
Use a ref when you have two or more things that must change at the same time. Think "database transactions" if you are familiar. The...
How to throw a C++ exception
...ned issue:
In function ‘void illustrateDerivedExceptionCatch()’:
item12Linux.cpp:48:2: warning: exception of type ‘MyException’ will be caught
catch(const MyException& e)
^~~~~
item12Linux.cpp:43:2: warning: by earlier handler for ‘std::exception’
catch (con...
Conditionally use 32/64 bit reference when building in Visual Studio
...es to the project, open the .csproj in a text editor. Before the first <ItemGroup> element within the <Project> element, add the following code, which will help determine which platform you're running (and building) on.
<!-- Properties group for Determining 64bit Architecture -->
...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...行都是对限定的一个描述，格式如下：
<domain> <type> <item> <value>
domain 表示用户或者组的名字，还可以使用 * 作为通配符。Type 可以有两个值，soft 和 hard。Item 则表示需要限定的资源，可以有很多候选值，如 stack，cpu，nofile ...
Can we define implicit conversions of enums in c#?
...king Fields
/// <summary>
/// The value of the enum item
/// </summary>
public readonly TValue Value;
/// <summary>
/// The public field name, determined from reflection
/// </summary>
private string _name;
...
Performance difference for control structures 'for' and 'foreach' in C#
...oreach loop.
I'd personally use LINQ to avoid the "if" too:
foreach (var item in list.Where(condition))
{
}
EDIT: For those of you who are claiming that iterating over a List<T> with foreach produces the same code as the for loop, here's evidence that it doesn't:
static void IterateOverLi...
Facebook Graph API v2.0+ - /me/friends returns empty, or only friends who also use my application
...
Can't see the taggable_friends in the items for review submission.
– AlikElzin-kilaka
Apr 17 '17 at 16:25
8
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List all the modules that are part of a python package?
...
This works for me:
import types
for key, obj in nltk.__dict__.iteritems():
if type(obj) is types.ModuleType:
print key
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fo...
What is the difference between a process and a thread?
...ion on the CPU.
Further down he provides the following table:
Per process items | Per thread items
------------------------------|-----------------
Address space | Program counter
Global variables | Registers
Open files | Stack
Child proce...