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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，需要根据每个应用自己的特点来关闭）
setsockopt(sock_fd, IPPROTO_TCP, TCP_NODELAY, (char *)&value,sizeof(int));
另外，网上有些文章说TCP_CORK的socket option是也关闭Nagle算法，这个还不够准确。TCP_CORK是禁止小包发送，而Nagle算法没有禁止小...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...json_encode() 函数中 options 参数的用法
<?php
$a = array('<foo>',"'bar'",'"baz"','&blong&', "\xc3\xa9");
echo "Normal: ", json_encode($a), "\n";
echo "Tags: ", json_encode($a, JSON_HEX_TAG), "\n";
echo "Apos: ", json_encode($a, JSON_HEX_APOS), "\n";
echo "Quot: ", json_enco...
std::enable_if to conditionally compile a member function
...;
std::is_same< T, int >::value >::type >
T foo() {
return 10;
}
*/
template < typename = typename std::enable_if< true >::type >
int foo();
/* instantiated from
template < typename = typenam...
What is the purpose of “return await” in C#?
...s of a method:
Task<SomeResult> DoSomethingAsync()
{
using (var foo = new Foo())
{
return foo.DoAnotherThingAsync();
}
}
async Task<SomeResult> DoSomethingAsync()
{
using (var foo = new Foo())
{
return await foo.DoAnotherThingAsync();
}
}
The f...
Should you declare methods using overloads or optional parameters in C# 4.0?
...th many permutations of the method signature for no more benefit. Consider Foo(A, B, C) requires Foo(A), Foo(B), Foo(C), Foo(A, B), Foo(A, C), Foo(B, C).
– Dan Lugg
May 7 '17 at 23:46
...
Negative matching using grep (match lines that do not contain foo)
...t, the following may be what you're looking for grep "" /dev/null * | grep foo | grep -v bar | cut -d: -f1 | sort -u (why the first grep?, there's always a way :))
– Motti
Oct 25 '17 at 7:18
...
define() vs. const
...nts: Either using the const keyword or using the define() function:
const FOO = 'BAR';
define('FOO', 'BAR');
The fundamental difference between those two ways is that const defines constants at compile time, whereas define defines them at run time. This causes most of const's disadvantages. Some ...
How to import other Python files?
... 1, Import a python module with python interpreter:
Put this in /home/el/foo/fox.py:
def what_does_the_fox_say():
print("vixens cry")
Get into the python interpreter:
el@apollo:/home/el/foo$ python
Python 2.7.3 (default, Sep 26 2013, 20:03:06)
>>> import fox
>>> fox.what_d...
Difference between
...
extends
The wildcard declaration of List<? extends Number> foo3 means that any of these are legal assignments:
List<? extends Number> foo3 = new ArrayList<Number>(); // Number "extends" Number (in this context)
List<? extends Number> foo3 = new ArrayList<Intege...
How to get a subset of a javascript object's properties
... Destructuring becomes more complicated if a key is non-alphanumeric, e.g. foo_bar.
The downside is that this requires to duplicate a list of keys, this results in verbose code in case a list is long. Since destructuring duplicates object literal syntax in this case, a list can be copied and pasted...