大约有 47,000 项符合查询结果（耗时：0.0755秒） [XML]
std::vector performance regression when enabling C++11
I have found an interesting performance regression in a small C++ snippet, when I enable C++11:
1 Answer
...
Why is the String class declared final in Java?
... have two strings that look alike when "seen as Strings", but that are actually different.
share
|
improve this answer
|
follow
|
...
psql: could not connect to server: No such file or directory (Mac OS X)
...
WARNING: If you delete postmaster.pid without making sure there are really no postgres processes running you, could permanently corrupt your database. (PostgreSQL should delete it automatically if the postmaster has exited.).
SOLUTION: This fixed the issue--I deleted this file, and then everyt...
correct way to use super (argument passing)
...
Shouldn't Base call super(Base, self).__init__()?
– cha0site
Jan 23 '12 at 14:47
4
...
ImportError: No module named six
...
Uli Köhler
11.3k1212 gold badges5151 silver badges101101 bronze badges
answered Dec 20 '12 at 8:19
Sylvain Defre...
How to close Android application?
...ion safely per its documentation. In the last Activity that is exited (usually the main Activity that first came up when the application started) just place a couple of lines in the onDestroy() method. The call to System.runFinalizersOnExit(true) ensures that all objects will be finalized and garb...
What's up with Java's “%n” in printf?
...e that you need \u000A linefeed character, for example in networking.
In all other situations use %n
share
|
improve this answer
|
follow
|
...
What's the difference between hard and soft floating point numbers?
...t float) in accuracy-critical parts and fast (hard float) in parts where small deviations don't matter.
– PhilLab
May 29 '17 at 12:18
...
Python != operation vs “is not”
...right hand side and the left hand side are the very same object. No methodcalls are done, objects can't influence the is operation.
You use is (and is not) for singletons, like None, where you don't care about objects that might want to pretend to be None or where you want to protect against object...
ERROR:'keytool' is not recognized as an internal or external command, operable program or batch file
...
answered Jun 2 '11 at 7:59
Ben WilliamsBen Williams
5,68022 gold badges2727 silver badges4848 bronze badges
...