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What is a 'semantic predicate' in ANTLR?
...ens (a lexer rule instead of a parser rule) that will match numbers in the range of 0..999. Now in the parser, you'd like to make a distinction between low- and hight numbers (low: 0..500, high: 501..999). This could be done using a disambiguating semantic predicate where you inspect the token next ...
What do (lambda) function closures capture?
...eateAdder(x):
return lambda y: y + x
adders = [createAdder(i) for i in range(4)]
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Is it faster to count down than it is to count up?
...appen on some hardware depending on what the compiler can deduce about the range of the numbers you're using: with the incrementing loop you have to test i<N each time round the loop. For the decrementing version, the carry flag (set as a side effect of the subtraction) may automatically tell you...
I've found my software as cracked download on Internet, what to do?
...experiment and discussed the results with me in private. These were a wide range of products. Some had a vertical market and some were very horizontal. Their conversion rate on the bogus key page was between 20% and 70%. Even at the low end that's a significant amount of extra revenue.
...
Difference between method and function in Scala
...
Let Say you have a List
scala> val x =List.range(10,20)
x: List[Int] = List(10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
Define a Method
scala> def m1(i:Int)=i+2
m1: (i: Int)Int
Define a Function
scala> (i:Int)=>i+2
res0: Int => Int = <function1>
s...
C# Thread safe fast(est) counter
...le from MS:
The following example determines how many random numbers that range from 0 to 1,000 are required to generate 1,000 random numbers with a midpoint value. To keep track of the number of midpoint values, a variable, midpointCount, is set equal to 0 and incremented each time the random numb...
Split comma-separated strings in a column into separate rows
... strings in a column into separate rows, as it was the fastest over a wide range of sizes:
s <- strsplit(v$director, ",", fixed=TRUE)
s <- data.frame(director=unlist(s), AB=rep(v$AB, lengths(s)))
Note that using fixed=TRUE has significant impact on timings.
Compared Methods:
met <- alist(...
When to call activity context OR application context?
...ecause of a ReceiverCallNotAllowedException. These crashes occur on a wide range of Android versions from API 15 up to 22.
https://possiblemobile.com/2013/06/context/#comment-2443283153
Because it's not guaranteed that all operations described as supported by Application Context in the table bel...
Looping in a spiral
...hon):
def spiral(X, Y):
x = y = 0
dx = 0
dy = -1
for i in range(max(X, Y)**2):
if (-X/2 < x <= X/2) and (-Y/2 < y <= Y/2):
print (x, y)
# DO STUFF...
if x == y or (x < 0 and x == -y) or (x > 0 and x == 1-y):
dx, d...
How to test that no exception is thrown?
...r perhaps something that embeds some other domain rules that restricts the range of a double to something specific, how best to test this component? I think an obvious test would be to assert that, when the resulting string is parsed, no exception is thrown. I would write that test using either the ...