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What are rvalues, lvalues, xvalues, glvalues, and prvalues?
...of rvalue, i.e. they're the rvalues that aren't xvalues.
Glvalues are the union of xvalues and lvalues in one group, because they do share a lot of properties in common.
So really, it all comes down to xvalues and the need to restrict movement to exactly and only certain places. Those places are ...
How to remove local (untracked) files from the current Git working tree
...s). If you want to clean the whole working copy, you should call it in its root directory.
– Eduardo Bezerra
Mar 8 '13 at 10:51
18
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为何谷歌不可复制？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...却市值突破千亿美金的大公司的本来面目。
这一切又是如何发生的呢？
后德鲁克时代的“传统”公司
《重新定义公司》这本书就试图解开上述谜团，本书的作者们包括埃里克·施密特(谷歌执行董事长)、乔纳森·罗森伯格(谷...
What do all of Scala's symbolic operators mean?
...ode has three automatic imports:
// Not necessarily in this order
import _root_.java.lang._ // _root_ denotes an absolute path
import _root_.scala._
import _root_.scala.Predef._
The first two only make classes and singleton objects available. The third one contains all implicit conversions a...
'sudo gem install' or 'gem install' and gem locations
...rse than just gem install is because it installs the gems for ALL USERS as root. This might be fine if you're the only person using the machine, but if you're not it can cause weirdness.
If you decide you want to blow away all your gems and start again it's much easier, and safer, to do so as a no...
NullPointerException accessing views in onCreate()
...ent onCreateView(), calling findViewById() on the inflated fragment layout rootView:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
View somethin...
Generate MD5 hash string with T-SQL
...he magic that worked for me to give a perfect match between SQL Server and MySql
select LOWER(CONVERT(VARCHAR(32), HashBytes('MD5', CONVERT(varchar, EmailAddress)), 2)) from ...
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Android Whatsapp/Chat Examples [closed]
...roid, application makes
http request to a server, implemented in php and mysql, to
authenticate, to register and to get the other friends' status and
data, then it communicates with other applications in other devices by
socket interface.
EDIT : Just found this! Maybe it's not related to W...
How to delete the contents of a folder?
...bolic links, should work on Windows as well.
import os
import shutil
for root, dirs, files in os.walk('/path/to/folder'):
for f in files:
os.unlink(os.path.join(root, f))
for d in dirs:
shutil.rmtree(os.path.join(root, d))
...
How to define custom configuration variables in rails
...
# config/initializers/load_config.rb
APP_CONFIG = YAML.load_file("#{Rails.root}/config/config.yml")[Rails.env]
# application.rb
if APP_CONFIG['perform_authentication']
# Do stuff
end
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