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What is the memory consumption of an object in Java?
...ive to useful payload (2 bytes for each char plus 4 bytes for the length), ranges from 100 to 400 percent.
Alignment
Consider this example object:
class X { // 8 bytes for reference to the class definition
int a; // 4 bytes
byte b; ...
In pure functional languages, is there an algorithm to get the inverse function?
...u can enumerate the domain of the function and can compare elements of the range for equality, you can - in a rather straightforward way. By enumerate I mean having a list of all the elements available. I'll stick to Haskell, since I don't know Ocaml (or even how to capitalise it properly ;-)
What ...
How to get the return value from a thread in python?
...ading import Thread
threads = [None] * 10
results = [None] * 10
for i in range(len(threads)):
threads[i] = Thread(target=foo, args=('world!', results, i))
threads[i].start()
# do some other stuff
for i in range(len(threads)):
threads[i].join()
print " ".join(results) # what sound d...
PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
...n popular Russian tech blog invented this approach:
Build the probability range of char codes in every encoding you want to support. You can build it using some big texts in your language (e.g. some fiction, use Shakespeare for english and Tolstoy for russian, lol ). You will get smth like this:
...
How to split text without spaces into list of words?
...,c in candidates)
# Build the cost array.
cost = [0]
for i in range(1,len(s)+1):
c,k = best_match(i)
cost.append(c)
# Backtrack to recover the minimal-cost string.
out = []
i = len(s)
while i>0:
c,k = best_match(i)
assert c == cost[i]
...
Accessing last x characters of a string in Bash
...3}$'
abc
$ echo abcd | egrep -o '.{1,3}$'
bcd
You can also use different ranges, such as 5,10 to get the last five to ten chars.
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How to choose the id generation strategy when using JPA and Hibernate
...ovide their own specialized implementations, however, Hibernate provides a range of built-in implementations. The shortcut names for the built-in generators are as follows:
increment
generates identifiers of type long, short or int that are unique only when no other process is inserting data into th...
What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
....
PNG if straight lines as in a comic or other drawing or if a wide color range is needed with transparency(and IE6 is not a factor)
And as commented, if you are unsure of what would qualify, try each format with different compression ratios and weigh the quality and size of the picture and choos...
Does name length impact performance in Redis?
...e proposed usage pattern ... and some more to test another (for instance a range of key lengths ranging from 8 characters to ... how long would you like ... 8 kilobytes?) ... and the measure it.
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Should I always use a parallel stream when possible?
...rayList , HashMap , HashSet , and ConcurrentHashMap instances; arrays; int ranges; and long ranges. What these data structures have in common is that they can all be accurately and cheaply split into subranges of any desired sizes, which makes it easy to divide work among parallel threads. The abstr...