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Why do we need extern “C”{ #include } in C++?
...ll use C++ name mangling. Here's an example.
Given test.C like so:
void foo() { }
Compiling and listing symbols in the object file gives:
$ g++ -c test.C
$ nm test.o
0000000000000000 T _Z3foov
U __gxx_personality_v0
The foo function is actually called "_Z3foov". This string...
What is your most productive shortcut with Vim?
...s they can also be used as "subjects" in our "statements." So I can use d/foo to cut from the current line to the next line containing the string "foo" and y?bar to copy from the current line to the most recent (previous) line containing "bar." If I don't want whole lines I can still use the searc...
How to check whether a Storage item is set?
...ou can use hasOwnProperty method to check this
> localStorage.setItem('foo', 123)
undefined
> localStorage.hasOwnProperty('foo')
true
> localStorage.hasOwnProperty('bar')
false
Works in current versions of Chrome(Mac), Firefox(Mac) and Safari.
...
Passing a list of kwargs?
...like this:
def method(**kwargs):
print kwargs
keywords = {'keyword1': 'foo', 'keyword2': 'bar'}
method(keyword1='foo', keyword2='bar')
method(**keywords)
Running this in Python confirms these produce identical results:
{'keyword2': 'bar', 'keyword1': 'foo'}
{'keyword2': 'bar', 'keyword1': 'fo...
Nullable type issue with ?: Conditional Operator
...know how convert null into a DateTime.
The solution is simple:
DateTime? foo;
foo = true ? (DateTime?)null : new DateTime(0);
Note that Nullable<DateTime> can be written DateTime? which will save you a bunch of typing.
...
How do I run a batch script from within a batch script?
...ar.bat that says echo This is bar.bat! and you want to call it from a file foo.bat, you can write this in foo.bat:
if "%1"=="blah" bar
Run foo blah from the command line, and you'll see:
C:\>foo blah
C:\>if "blah" == "blah" bar
C:\>echo This is bar.bat!
This is bar.bat!
But beware: ...
How to expand a list to function arguments in Python [duplicate]
... the documentation as "Unpacking argument lists".
You'd use it like this: foo(*values). There's also one for dictionaries:
d = {'a': 1, 'b': 2}
def foo(a, b):
pass
foo(**d)
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What does the 'u' symbol mean in front of string values? [duplicate]
...on Python 2.
You can create a Unicode string multiple ways:
>>> u'foo'
u'foo'
>>> unicode('foo') # Python 2 only
u'foo'
But the real reason is to represent something like this (translation here):
>>> val = u'Ознакомьтесь с документацией'
>>...
slim dynamic conditional class [closed]
...have multiple conditions I am doing right now something like
div class=(('foo ' if is_foo?) + ('bar' if is_bar?))
Though I feel it to be a blemish if is_bar? return false and the generated HTML results in
<div class="foo "></div>
(the blemish is the blank character after the foo). ...
How do I pass a method as a parameter in Python
...
Yes it is possible. Just call it:
class Foo(object):
def method1(self):
pass
def method2(self, method):
return method()
foo = Foo()
foo.method2(foo.method1)
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