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Why is reading lines from stdin much slower in C++ than Python?
...
tl;dr: Because of different default settings in C++ requiring more system calls.
By default, cin is synchronized with stdio, which causes it to avoid any input buffering. If you add this to the top of your main, you should see much better performance:
std::ios...
Java 8 Streams: multiple filters vs. complex condition
... public Gender getGender() {
return gender;
}
public void setGender(Gender gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
static long test1(List<User> users)...
Why does Unicorn need to be deployed together with Nginx?
...but it's less efficient than most other traditional web servers.
Most RoR setups use a combination of both traditional web servers and Rack servers to apply the best of both of their capabilities. Nginx is incredibly fast at request redirection through proxy balancing and serving up static content...
Java logical operator short-circuiting
Which set is short-circuiting, and what exactly does it mean that the complex conditional expression is short-circuiting?
9...
Why does pthread_cond_wait have spurious wakeups?
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How does delete[] “know” the size of the operand array?
...(int)*5)
Will store "4" in the first sizeof(int) bytes
*temp = 4;
and set i
i = temp + 1;
So i will points to an array of 4 elements, not 5.
And deletion
delete[] i;
will be processed in the following way:
int *temp = i - 1;
int numbers_of_element = *temp; // = 4
... call destructor for...
Running Selenium WebDriver python bindings in chrome
...r/lib/chromium-browser/ If you add this to your .bashrc, you won't need to set it each time you want to test with selenium.
– Arpad Horvath
Jun 19 '16 at 6:37
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Remote connect to clearDB heroku database
...this directly on the Heroku dashboard/website, just go to your app, click "Settings" and "Reveal config vars".
– Eirik H
Aug 24 '14 at 21:06
1
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What does “fragment” mean in ANTLR?
...e.toStringTree(recog=parser))
listener = MyListener()
walker = ParseTreeWalker()
walker.walk(listener, tree)
# end-of-def
main()
Case1 and results:
Alphabet.g4 (Case1)
grammar Alphabet;
content : (rule0|ANYCHAR)* EOF;
rule0 : RULE1 | RULE2 | RULE3 ;
RULE1 : [A-C]+ ;
RULE2 : [...
How to check if a user is logged in (how to properly use user.is_authenticated)?
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