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Recursive lambda functions in C++11
...ever it's initialized with, but what you're initializing it with needs to know what its type is (in this case, the lambda closure needs to know the types it's capturing). Something of a chicken-and-egg problem.
On the other hand, a fully specified function object's type doesn't need to "know" anyt...
What does __FILE__ mean in Ruby?
...preted as "foo.rb".
Edit: Ruby 1.9.2 and 1.9.3 appear to behave a little differently from what Luke Bayes said in his comment. With these files:
# test.rb
puts __FILE__
require './dir2/test.rb'
# dir2/test.rb
puts __FILE__
Running ruby test.rb will output
test.rb
/full/path/to/dir2/test.rb
...
correct way to use super (argument passing)
...
If you're going to have a lot of inheritence (that's the case here) I suggest you to pass all parameters using **kwargs, and then pop them right after you use them (unless you need them in upper classes).
class First(object)...
What does 'require: false' in Gemfile mean?
...probably it does more requires of its own. Even if you require 'yaml', you now have the YAML module as an object in memory.
– Nathan Long
Oct 17 '13 at 19:31
2
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List all the files that ever existed in a Git repository
Do you have a clean way to list all the files that ever existed in specified branch?
4 Answers
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What is the purpose of the single underscore “_” variable in Python?
...ases above). For example year,month,day = date() will raise a lint warning if the day variable is not used later on in the code, the fix if the day is truly not needed is to write year,month,_ = date(). Same with lambda functions, lambda arg: 1.0 is creating a function requiring one argument but not...
What's the difference between eval, exec, and compile?
...built-in function (both are built-in functions in Python 3).
It is a well-known fact that the official syntax of exec in Python 2 is exec code [in globals[, locals]].
Unlike majority of the Python 2-to-3 porting guides seem to suggest, the exec statement in CPython 2 can be also used with syntax th...
BaseException.message deprecated in Python 2.6
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Using str breaks if the exception was constructed with a unicode argument: str(MyException(u'\xe5')) raises UnicodeEncodeError. Using unicode instead of str isn't foolproof either because unicode(MyException('\xe5')) raises UnicodeDecodeError...
How to find out if you're using HTTPS without $_SERVER['HTTPS']
...seen many tutorials online that says you need to check $_SERVER['HTTPS'] if the server is connection is secured with HTTPS. My problem is that on some of the servers I use, $_SERVER['HTTPS'] is an undefined variable that results in an error. Is there another variable I can check that should alwa...
Get the current script file name
If I have PHP script, how can I get the filename from inside that script?
16 Answers
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