大约有 5,229 项符合查询结果（耗时：0.0265秒） [XML]
How can I declare and use Boolean variables in a shell script?
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64
Use arithmetic expressions.
#!/bin/bash
false=0
true=1
((false)) && echo false
((tru...
What's the difference between :: (double colon) and -> (arrow) in PHP?
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casablancacasablanca
64.3k55 gold badges121121 silver badges142142 bronze badges
a...
How do malloc() and free() work?
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64
Soooo many people don't realise that free() may not return memory to the OS, it's infuriating. Thanks for helping enlighten them.
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What does O(log n) mean exactly?
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648
O(log N) basically means time goes up linearly while the n goes up exponentially. So if it tak...
How to get current CPU and RAM usage in Python?
...x, Windows, OSX, Sun Solaris, FreeBSD, OpenBSD and NetBSD, both 32-bit and 64-bit architectures, with Python versions from 2.6 to 3.5 (users of Python 2.4 and 2.5 may use 2.1.3 version).
Some examples:
#!/usr/bin/env python
import psutil
# gives a single float value
psutil.cpu_percent()
# gives an...
What are the disadvantages of using persistent connection in PDO
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Shankar Damodaran
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answered Jul 12 '12 at 14:33
PrashantPrasha...
Arrays, heap and stack and value types
... edited Feb 20 at 3:58
41686d6564
12.9k1010 gold badges2929 silver badges5959 bronze badges
answered Jul 11 '09 at 14:35
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XmlSerializer: remove unnecessary xsi and xsd namespaces
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64
Since Dave asked for me to repeat my answer to Omitting all xsi and xsd namespaces when seriali...
How line ending conversions work with git core.autocrlf between different operating systems
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64
The issue of EOLs in mixed-platform projects has been making my life miserable for a long time....
How do I profile memory usage in Python?
...3 1612820 49 1612820 49 str
1 11699 24 483960 15 2096780 64 tuple
2 174 0 241584 7 2338364 72 dict of module
3 3478 7 222592 7 2560956 78 types.CodeType
4 3296 7 184576 6 2745532 84 function
5 401 1 175112 5 2920644 ...