大约有 18,600 项符合查询结果（耗时：0.0259秒） [XML]
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...ehalem: it often has a hard time keeping its execution units busy. Sandybridge's introduction of the uop cache increased frontend throughput a huge amount. Aligning branch targets is done because of this issue, but it affects all code.
– Peter Cordes
Dec 7 '1...
Execution of Python code with -m option or not
...e a package, so __package__ is set to None.
But run a package or module inside a package with -m and now there is at least the possibility of a package, so the __package__ variable is set to a string value; in the above demonstration it is set to 'foo.bar', for plain modules not inside a package it ...
Difference between timestamps with/without time zone in PostgreSQL
...one. Thus, when converting timestamptz to a time zone you are asking what did the clock show in New York at this absolute point in time? whereas when "converting" a timestamp, you're asking what was the absolute point in time when the clock in New York showed x?
– fphilipe
...
Writing your own STL Container
Are there guidelines on how one should write new container which will behave like any STL container?
3 Answers
...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...y, because it was worth about 40 points. I figure that most of the class didn't solve it correctly, because I haven't come up with a solution in the past 24 hours.
...
How are strings passed in .NET?
...passed by reference. This is a subtle, but very important distinction. Consider the following code:
void DoSomething(string strLocal)
{
strLocal = "local";
}
void Main()
{
string strMain = "main";
DoSomething(strMain);
Console.WriteLine(strMain); // What gets printed?
}
There are th...
Tags for Emacs: Relationship between etags, ebrowse, cscope, GNU Global and exuberant ctags
I work on C++ projects, and I went through Alex Ott's guide to CEDET and other threads about tags in StackOverflow, but I am still confused about how Emacs interfaces with these different tag systems to facilitate autocompletion, the looking up of definitions, navigation of source code base or the...
Regular expressions in C: examples?
...es of how to use regular expressions in ANSI C. man regex.h does not provide that much help.
5 Answers
...
What are type lambdas in Scala and what are their benefits?
...uite a bit of the time when you are working with higher-kinded types.
Consider a simple example of defining a monad for the right projection of Either[A, B]. The monad typeclass looks like this:
trait Monad[M[_]] {
def point[A](a: A): M[A]
def bind[A, B](m: M[A])(f: A => M[B]): M[B]
}
Now...
Catching an exception while using a Python 'with' statement
...manager and those in the body of the with statement, so it may not be a valid solution for all use cases.
– ncoghlan
Mar 6 '11 at 5:14
...