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Difference in make_shared and normal shared_ptr in C++
Many google and stackoverflow posts are there on this, but I am not able to understand why make_shared is more efficient than directly using shared_ptr .
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Git cherry pick vs rebase
...ust one more thing I want to add: if you git checkout topic and then git reset --hard C' after the cherry picking, then you have the very same result as after rebasing. I saved myself from a lot of merge conflicts using cherry picking over rebasing, because the common ancestor was way back.
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What does tree-ish mean in Git?
...)directory tree can also be
used to point to a commit. In other words, the set of "commit-ish" identifiers
is a strict subset of the set of "tree-ish" identifiers.
As explained in the documentation (thanks to Trebor for helping
me find it):
<tree>
Indicates a tree object name.
<co...
Struggling with NSNumberFormatter in Swift for currency
...to my program, so that bit is sorted. Now I just need to figure out how to set the text field placeholders based on the users location.
– user3746428
Jul 25 '14 at 17:43
2
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How to minify php page html output?
I am looking for a php script or class that can minify my php page html output like google page speed does.
13 Answers
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Get top n records for each group of grouped results
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It's not a problem if it's desired. You can set the order of a.person.
– Alberto Leal
Sep 21 '17 at 18:18
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grep a file, but show several surrounding lines?
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For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match.
grep -B 3 -A 2 foo README.txt
If you want the same number of lines before and after you can use -C num.
grep -C 3 foo README.txt
Th...
pandas: filter rows of DataFrame with operator chaining
... b". Note that the following are valid: df.query('a in list([1,2])'), s = set([1,2]); df.query('a in @s').
– user3780389
Nov 15 '16 at 16:14
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How to write to file in Ruby?
I need to read the data out of database and then save it in a text file.
7 Answers
7
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What do parentheses surrounding an object/function/class declaration mean? [duplicate]
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It is a self-executing anonymous function. The first set of parentheses contain the expressions to be executed, and the second set of parentheses executes those expressions.
It is a useful construct when trying to hide variables from the parent namespace. All the code within t...