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Why can tuples contain mutable items?
...the overall tuple isn't hashable either. For example, t = ('red', [10, 20, 30]) isn't hashable.
The last example shows a 2-tuple that contains a string and a list. The tuple itself isn't mutable (i.e. it doesn't have any methods that for changing its contents). Likewise, the string is immutable b...
HTML - how can I show tooltip ONLY when ellipsis is activated
...unction() { ... });
– Ziad
Jan 29 '13 at 11:48
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How do I Convert DateTime.now to UTC in Ruby?
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DanSingermanDanSingerman
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NULL values inside NOT IN clause
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Query A is the same as:
select 'true' where 3 = 1 or 3 = 2 or 3 = 3 or 3 = null
Since 3 = 3 is true, you get a result.
Query B is the same as:
select 'true' where 3 <> 1 and 3 <> 2 and 3 <> null
When ansi_nulls is on, 3 <> null is UNKNOWN,...
How to forward declare a C++ template class?
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Simulator slow-motion animations are now on?
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edited Apr 13 '15 at 5:29
answered Dec 24 '11 at 12:33
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What is the purpose of std::make_pair vs the constructor of std::pair?
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answered Feb 14 '12 at 1:39
Tor ValamoTor Valamo
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Difference between single and double quotes in Bash
... echo '$(echo "upg")'
$(echo "upg")
The Bash manual has this to say:
3.1.2.2 Single Quotes
Enclosing characters in single quotes (') preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.
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C++ sorting and keeping track of indexes
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Using C++ 11 lambdas:
#include <iostream>
#include <vector>
#include <numeric&...
Unpacking, extended unpacking and nested extended unpacking
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