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Why are arrays covariant but generics are invariant?
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153
Via wikipedia:
Early versions of Java and C# did not include generics (a.k.a. parametric pol...
Where do “pure virtual function call” crashes come from?
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edited Dec 16 '15 at 6:30
Destructor
12.9k66 gold badges4444 silver badges101101 bronze badges
answer...
Node.js or Erlang
...nal state.
– Dmitry Belyaev
Mar 2 '13 at 0:06
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How Pony (ORM) does its tricks?
..._code)
1 0 LOAD_FAST 0 (.0)
>> 3 FOR_ITER 26 (to 32)
6 STORE_FAST 1 (c)
9 LOAD_FAST 1 (c)
12 LOAD_ATTR 0 (country)
15 LOAD_CONST ...
What is the difference between \r and \n?
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391
They're different characters. \r is carriage return, and \n is line feed.
On "old" printers, ...
How can I use if/else in a dictionary comprehension?
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31
Worth mentioning that you don't need to have an if-else condition for both the key and the value. For example, {(a if condition else b): v...
Why is my git repository so big?
...po
d2=#new repo (must already exist)
cd $d1
for b in $(git branch | cut -c 3-)
do
git checkout $b
x=$(git rev-parse HEAD)
cd $d2
git checkout -b $b $x
cd $d1
done
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improv...
Shards and replicas in Elasticsearch
...ontain your data:
____ ____ ____ ____ ____
| 1 | | 2 | | 3 | | 4 | | 5 |
|____| |____| |____| |____| |____|
Every time you index a document, elasticsearch will decide which primary shard is supposed to hold that document and will index it there. Primary shards are not a ...
A migration to add unique constraint to a combination of columns
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answered Jul 30 '10 at 9:45
Robert SpeicherRobert Speicher
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What are Makefile.am and Makefile.in?
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394
Makefile.am is a programmer-defined file and is used by automake to generate the Makefile.in f...