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What does the “@” symbol mean in reference to lists in Haskell?
...r any constructor; if you have data Tree a = Tree a [Tree a], then t@(Tree _ kids) gives you access to both the tree and its children.
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INSERT statement conflicted with the FOREIGN KEY constraint - SQL Server
...act so that if you were to try on your own and didn't realize there was an order of operations, then you would get this error. Naturally after adding the primary key data, your foreign key data in the child table must conform to the primary key field in the parent table, otherwise, you will still g...
What is referential transparency?
... as its internal structure, the number
and nature of its components, the order in which they are evaluated or the colour of the ink
in which they are written, are irrelevant to the value of the main expression.
The use of "in essence" suggests that Strachey is paraphrasing it in order to expla...
Fit background image to div
...is the most appropriated one.
Source:
http://www.w3schools.com/cssref/css3_pr_background-size.asp
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How to find all duplicate from a List? [duplicate]
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+1 for HashSet. I think that internally(because of ordering and stuff) it performs faster search.
– Davi Fiamenghi
Apr 16 '13 at 15:07
1
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Compelling examples of custom C++ allocators?
...nging a single
std::vector<T>
to
std::vector<T,tbb::scalable_allocator<T> >
(this is a quick and convenient way of switching the allocator to use TBB's nifty thread-private heaps; see page 7 in this document)
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What happens to my apps after my developer account membership expires? [closed]
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How to check type of files without extensions in python?
...tempt to classify it. There are three
sets of tests, performed in this order: filesystem tests, magic number
tests, and language tests. The first test that succeeds causes the
file type to be printed.
You would need to run the file command with the subprocess module and then parse th...
PostgreSQL create table if not exists
...ns, here is a function to work around it:
CREATE OR REPLACE FUNCTION create_mytable()
RETURNS void
LANGUAGE plpgsql AS
$func$
BEGIN
IF EXISTS (SELECT FROM pg_catalog.pg_tables
WHERE schemaname = 'myschema'
AND tablename = 'mytable') THEN
RAISE NOTICE 'T...
How to redirect to previous page in Ruby On Rails?
...@pSkarl How can I pass a notice object with the redirect_back statement in order to tell the user something went wrong with a flash message?
– alexventuraio
Dec 12 '16 at 5:54
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