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How can I generate random alphanumeric strings?
...but the characters are restricted to A-F0-9 and the max possible length is 32 chars.
– LukeH
Aug 28 '09 at 1:01
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Explain the use of a bit vector for determining if all characters are unique
... between them:
Size. int has fixed size, usually 4 bytes which means 8*4=32 bits (flags). Bit vector usually can be of different size or you should specify the size in constructor.
API. With bit vectors you will have easier to read code, probably something like this:
vector.SetFlag(4, true); // s...
How can I create a UIColor from a hex string?
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132
This is great except it doesn't do what the questioner asks, which is to convert a hex STRING into a UIColor. This converts an integer to a...
Value of type 'T' cannot be converted to
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– Fernando Gómez
May 30 '19 at 23:32
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show 2 more comme...
Why is early return slower than else?
...984281521812363]
>>> T(lambda : with_else()).repeat()
[0.36009842032996175, 0.28962249392031936, 0.2927151355828528]
>>> T(lambda : without_else(True)).repeat()
[0.31709728471076915, 0.3172671387005721, 0.3285821242644147]
>>> T(lambda : with_else(True)).repeat()
[0.309398...
What is the tilde (~) in the enum definition?
...op Vaidya
45.1k1313 gold badges103103 silver badges132132 bronze badges
answered Dec 22 '08 at 21:38
JimmyJimmy
77.8k1616 gold bad...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...内存容易造成内存碎片，不利于回收。 64位系统最好分配32M以上内存，这是使用mmap的阈值。
tcmalloc
tcmalloc是Google开源的一个内存管理库， 作为glibc malloc的替代品。目前已经在chrome、safari等知名软件中运用。
根据官方测试报...
What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL?
...8 to 127 0 to 255
smallint | 2 bytes -32768 to 32767 0 to 65535
mediumint | 3 bytes -8388608 to 8388607 0 to 16777215
int/integer | 4 bytes -2147483648 to 2147483647 0 to 4294967295
bigi...
How to create ls in windows command prompt?
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answered Feb 20 '12 at 14:32
hmjdhmjd
111k1616 gold badges185185 silver badges238238 bronze badges
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“java.lang.OutOfMemoryError : unable to create new native Thread”
...utOfMemoryError : unable to create new native Thread " on 8GB RAM VM after 32k threads (ps -eLF| grep -c java)
13 Answers
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