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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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What are unit tests, integration tests, smoke tests, and regression tests?
... located under myprj, I have the unit tests located under myprj/tests/test_module1.py, and my package located under myprj/mypkg. This works great for unit tests, but I wonder if there is any convention, I should follow for where the integration tests should reside?
– alpha_9...
Android : difference between invisible and gone?
...Visibility=Gone then you have to initialize the component..like
eg Button _mButton = new Button(this);
_mButton = (Button)findViewByid(R.id.mButton);
so it will take more time as compared to Visibility = invisible.
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Alter Table Add Column Syntax
...c NOT NULL IDENTITY (1, 1)
ALTER TABLE Employees ADD CONSTRAINT
PK_Employees PRIMARY KEY CLUSTERED
(
EmployeeID
) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
...
Unicode Processing in C++
...th, capitalization status, etc. Never use standard library builtins like is_alpha unless that is the definition you want.
I can't say it enough: never iterate over the indices of a string if you care about correctness, always use your unicode library for this.
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NullPointerException in Java with no StackTrace
...roduction – and the fix
I've tested it on Mac OS X
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03-383-11A511)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-383, mixed mode)
Object string = "abcd";
int i = 0;
while (i < 12289) {
i++;
try {
In...
AtomicInteger lazySet vs. set
...erve as a soft barrier costing 20 cycles on nehelem intel cpu)
on x86 (x86_64) such a barrier is much cheaper performance-wise than volatile or AtomicLong getAndAdd ,
In an one producer, one consumer queue scenario, xchg soft barrier can force the line of codes before the lazySet(sequence+1) for ...
JavaScript closure inside loops – simple practical example
...e best way to do this kind of thing now. There's also lo-dash/underscore's _.partial when you don't need or want to mess with bind's thisArg.
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How to read from standard input in the console?
...lock
reader := bufio.NewReader(os.Stdin)
fmt.Print("Enter text: ")
text, _ := reader.ReadString('\n')
fmt.Println(text)
As it works on my machine. However, for the next block you need a pointer to the variables you're assigning the input to. Try replacing fmt.Scanln(text2) with fmt.Scanln(&t...
Are there any disadvantages to always using nvarchar(MAX)?
...e, the value gets pushed out of row based on may more factors, including sp_tableoptions: msdn.microsoft.com/en-us/library/ms173530.aspx. VARCHAR(255) types can also b pushed out of row, the 'overhead' mentioned may be exactly the same for MAX and 255. It compares MAX types with TEXT types, when the...