StackOverflow2013

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plurals

PO
primarykey
Id
17741269
data
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0
AnswerCount
0
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2013-07-19T08:17:30.140
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2013-07-19T09:31:29.427
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2013-07-19T09:31:29.427
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279597
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279597
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17724876
PostTypeId
2
Score
2
ViewCount
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LastEditorDisplayName
text
Body
As mentioned in the comments, <code>std::shuffle</code> takes a random number generator (or engine in standard speak), not a random number distribution. Different random number generators have different characteristics even if they have a theoretically uniform distribution. <ul> <li>Random or pseudo-random - True random number generators use some sort of an external entropy source. Pseudo-random generators (PRNGs) are strictly deterministic.</li> <li>Performance - some generators are faster than others.</li> <li>Memory usage - some PRNGs need more memory to store their state than others.</li> <li>Period length - all PRNGs have a finite period after which they start repeating the same sequence from the beginning. Some have much longer periods than others.</li> <li>Randomness quality - there are <a href="http://en.wikipedia.org/wiki/Randomness_test" rel="nofollow">numerous tests</a> for measuring whether there are subtle (or not-so-subtle!) patterns in a pseurorandom stream. See, for example, the <a href="http://en.wikipedia.org/wiki/Diehard_tests" rel="nofollow">Diehard tests</a>.</li> <li>Whether the stream is <a href="http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator" rel="nofollow">cryptographically secure</a> or not. AFAIK, none of the standard PRNGs are.</li> </ul> For an overview of the different generators offered by the standard, please refer to <a href="http://en.cppreference.com/w/cpp/numeric/random" rel="nofollow">http://en.cppreference.com/w/cpp/numeric/random</a>.
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1. This table or related slice is empty.
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1. POUse and utility of std::shuffle?
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1. PTAnswer
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1. USJohannesD
UserOwnerUserId
1. USJohannesD
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1. POUse and utility of std::shuffle?
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