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实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...一台Nginx至多只能建立六万多个连接（net.ipv4.ip_local_port_range），有点儿少。
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当然，本文的描述只是沧海一粟，还有很多技术可供选择，比如Pub/Sub，WebSocket等等，篇幅所限，这里就不多说了，有兴趣的读者请自己查阅。
Polli...
What does auto&& tell us?
...amp; works perfectly! An example of using auto&& like this is in a range-based for loop. See my other question for more details.
If you then use std::forward on your auto&& reference to preserve the fact that it was originally either an lvalue or an rvalue, your code says: Now that ...
How to learn R as a programming language [closed]
... program" in any language involves finding problems outside of your normal range of experience and then trying to solve them using a programming language.
The projects that taught me the most about how to program with R had nothing to do with statistics at all.
Knowing functions like parse() and e...
Python pandas: fill a dataframe row by row
... pandas as pd
df = pd.DataFrame(columns=('col1', 'col2', 'col3'))
for i in range(5):
df.loc[i] = ['<some value for first>','<some value for second>','<some value for third>']`
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OPTION (RECOMPILE) is Always Faster; Why?
...ATISTICS - Statistics are out of date. A database stores statistics on the range and distribution of the types of values in various column on tables and indexes. This helps the query engine to develop a "Plan" of attack for how it will do the query, for example the type of method it will use to matc...
jQuery datepicker set selected date, on the fly
...eck that the date you are trying to set it to lies within the allowed date range if the minDate or maxDate options are set.
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SQL Server 2005 How Create a Unique Constraint?
...col1 IS NOT NULL;
See Field value must be unique unless it is NULL for a range of answers.
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What's the difference between the atomic and nonatomic attributes?
... answered May 25 '12 at 10:56
raw3draw3d
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performSelector may cause a leak because its selector is unknown
.... In Objective-C, developers are able to do this by using C style casts on raw function pointers.
With the introduction of Swift, Apple has documented the performSelector: family of methods as "inherently unsafe" and they are not available to Swift.
Over time, we have seen this progression:
Earl...
Convert integer to binary in C#
...ing Enumerable and LINQ is:
int number = 25;
string binary = Enumerable.Range(0, (int) Math.Log(number, 2) + 1).Aggregate(string.Empty, (collected, bitshifts) => ((number >> bitshifts) & 1 )+ collected);
sha...