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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...e reader first time poster! I'm playing around with the boost::multi_index container stuff and have a rather in-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys can be f...
Can Python print a function definition?
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answered Oct 13 '09 at 20:41
TriptychTriptych
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Find element's index in pandas Series
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>>> myseries[myseries == 7]
3 7
dtype: int64
>>> myseries[myseries == 7].index[0]
3
Though I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level....
lsof survival guide [closed]
lsof is an increadibly powerful command-line utility for unix systems. It lists open files, displaying information about them. And since most everything is a file on unix systems, lsof can give sysadmins a ton of useful diagnostic data.
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How to insert an item at the beginning of an array in PHP?
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Use array_unshift($array, $item);
$arr = array('item2', 'item3', 'item4');
array_unshift($arr , 'item1');
print_r($arr);
will give you
Array
(
[0] => item1
[1] => item2
[2] => item3
[3] => item4
)
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How do I use shell variables in an awk script?
...0;++i) print i"'
awk 'BEGIN {print "'"$variable"'"}'
line one
line two
1
2
3
.
.
1000
You can add lots of commands to awk this way. Even make it crash with non valid commands.
Extra info:
Use of double quote
It's always good to double quote variable "$variable"
If not, multiple lines will be...
Convert hex string to int
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Denys SéguretDenys Séguret
321k6969 gold badges680680 silver badges668668 bronze badges
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Scoping in Python 'for' loops
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edited Aug 31 '10 at 18:38
answered Aug 31 '10 at 18:22
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How can I do a case insensitive string comparison?
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Liam
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answered Dec 20 '12 at 4:40
ocean4dreamocean...
Is it possible to read the value of a annotation in java?
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edited Oct 24 '18 at 11:36
arjuncc
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answered No...