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Where is PATH_MAX defined in Linux?
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Its in linux/limits.h.
#define PATH_MAX 4096 /* # chars in a path name including nul */
#include <linux/limits.h>
char current_path[PATH_MAX];
PATH_MAX has some flaws as mentioned in this blog (thanks paulsm4)
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find -exec with multiple commands
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688
find accepts multiple -exec portions to the command. For example:
find . -name "*.txt" -exec ...
EF Migrations: Rollback last applied migration?
...or better yet, take a shot at implementing it! https://github.com/dotnet/ef6
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What's the difference between deque and list STL containers?
...that a horse works like a dog because they both implement attack() and make_noise().
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Make absolute positioned div expand parent div height
...ld1 and child2 in relative divs with display:none in parent div. Say child1_1 and child2_2. Put child2_2 on top and child1_1 at the bottom.
When your jquery (or whatever) calls the absolute div, just set the according relative div (child1_1 or child2_2) with display:block AND visibility:hidden. The...
Postgresql aggregate array
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163
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as marks...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
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TylerH
18.1k1212 gold badges6161 silver badges8080 bronze badges
answered Mar 20 '14 at 19:09
Portland RunnerPortland Runner
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Determine what attributes were changed in Rails after_save callback?
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186
Rails 5.1+
Use saved_change_to_published?:
class SomeModel < ActiveRecord::Base
after_upd...
Iterate keys in a C++ map
...te on the keys instead of the pairs), then take a look at Boost's transform_iterator.
[Tip: when looking at Boost documentation for a new class, read the "examples" at the end first. You then have a sporting chance of figuring out what on earth the rest of it is talking about :-)]
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