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What does “fragment” mean in ANTLR?
...erves to simplify a grammar.
Consider:
NUMBER: DIGITS | OCTAL_DIGITS | HEX_DIGITS;
fragment DIGITS: '1'..'9' '0'..'9'*;
fragment OCTAL_DIGITS: '0' '0'..'7'+;
fragment HEX_DIGITS: '0x' ('0'..'9' | 'a'..'f' | 'A'..'F')+;
In this example, matching a NUMBER will always return a NUMBER to the lexer, ...
Java - sending HTTP parameters via POST method easily
...
int postDataLength = postData.length;
String request = "http://example.com/index.php";
URL url = new URL( request );
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setDoOutput( true );
conn.setInstanceFollowRedirects( false );
conn.setReque...
Regular expressions in an Objective-C Cocoa application
Initial Googling indicates that there's no built-in way to do regular expressions in an Objective-C Cocoa application.
10 A...
How can I convert a string to a number in Perl?
...t and I need to convert that string into a floating point variable. So an example of the string I have is "5.45" and I want a floating point equivalent so I can add .1 to it. I have searched around the internet, but I only see how to convert a string to an integer.
...
What is __future__ in Python used for and how/when to use it, and how it works
...le changes or to such ones introducing new keywords.
E.g., for using context managers, you had to do from __future__ import with_statement in 2.5, as the with keyword was new and shouldn't be used as variable names any longer. In order to use with as a Python keyword in Python 2.5 or older, you wil...
Using wget to recursively fetch a directory with arbitrary files in it
...ursive, of course), otherwise it will follow the link in the directory index on my site to the parent directory. So the command would look like this:
wget --recursive --no-parent http://example.com/configs/.vim/
To avoid downloading the auto-generated index.html files, use the -R/--reject option:...
PHP Replace last occurrence of a String in a String?
...ctions. (But did they have to change the name?)
– alexis
Dec 5 '18 at 20:55
...
Check if passed argument is file or directory in Bash
I'm trying to write an extremely simple script in Ubuntu which would allow me to pass it either a filename or a directory, and be able to do something specific when it's a file, and something else when it's a directory. The problem I'm having is when the directory name, or probably files too, has s...
Convert hex string to int in Python
How do I convert a hex string to an int in Python?
12 Answers
12
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How do I typedef a function pointer with the C++11 using syntax?
...
It has a similar syntax, except you remove the identifier from the pointer:
using FunctionPtr = void (*)();
Here is an Example
If you want to "take away the uglyness", try what Xeo suggested:
#include <type_traits>
using FunctionPtr = ...