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Hidden features of Windows batch files
...nd! While I hate writing batch files, I'm thankful for it.
FOR /F "eol=; tokens=2,3* delims=, " %i in (myfile.txt) do @echo %i %j %k
would parse each line in myfile.txt, ignoring lines that begin with a semicolon, passing the 2nd and 3rd token from each line to the for body, with tokens delimite...
Android: Storing username and password?
...spicuous, and less
likely to be successful. Instead use an authorization token and
refresh it.
Where possible, username and password should not be stored on the
device. Instead, perform initial authentication using the username and
password supplied by the user, and then use a short-liv...
When should I use Memcache instead of Memcached?
...memcache client. The most important features that memcached has are:
Cas tokens. This made my life much easier and is an easy preventive system for stale data. Whenever you pull something from the cache, you can receive with it a cas token (a double number). You can than use that token to save you...
Why are #ifndef and #define used in C++ header files?
...
#ifndef <token>
/* code */
#else
/* code to include if the token is defined */
#endif
#ifndef checks whether the given token has been #defined earlier in the file or in an included file; if not, it includes the code between it an...
Android: Test Push Notification online (Google Cloud Messaging) [closed]
...n response from GCM server, please cross check the validity of your device token. You may check the validity of your device token using following url:
https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=YOUR_DEVICE_TOKEN
Some response codes:
Following is the description of some response c...
Why can't C++ be parsed with a LR(1) parser?
...ing
(int(x)), (y), (new int));
(a comma-separated expression).
The two token sequences have the same initial subsequence but different parse trees, which depend on the last element. There can be arbitrarily many tokens before the disambiguating one.
...
What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
...cc's current implementation of new C++11 headers, I stumbled upon "......" token. You can check, that the following code compiles fine [via ideone.com].
...
Scanner vs. BufferedReader
...
Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream and does not do any special parsing.
In fact you can pass a BufferedReader to a scanner as the source of characters to parse.
...
ANTLR: Is there a simple example?
...uce any error message, and the files ExpLexer.java, ExpParser.java and Exp.tokens should now be generated.
To see if it all works properly, create this test class:
import org.antlr.runtime.*;
public class ANTLRDemo {
public static void main(String[] args) throws Exception {
ANTLRStrin...
What's the difference between OpenID and OAuth?
...mited to the 'this is who I am' assertion, while OAuth provides an 'access token' that can be exchanged for any supported assertion via an API).
2. Features
Both protocols provide a way for a site to redirect a user somewhere else and come back with a verifiable assertion. OpenID provides an identit...