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What does Expression.Quote() do that Expression.Constant() can’t already do?
...on.
(Aside: I've just reviewed the code generator for delegate creation from quoted expression trees, and unfortunately a comment that I put into the code back in 2006 is still there. FYI, the hoisted outer parameter is snapshotted into a constant when the quoted expression tree is reified as a d...
Enum ToString with user friendly strings
...
I use the Description attribute from the System.ComponentModel namespace. Simply decorate the enum:
private enum PublishStatusValue
{
[Description("Not Completed")]
NotCompleted,
Completed,
Error
};
Then use this code to retrieve it:
pub...
Typedef function pointer?
...sion about the entanglement of the alias and name. I learned something new from reading this post.
– Mad Physicist
Apr 7 '15 at 20:51
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What is Ruby's double-colon `::`?
... CONSTANT = 4
end
end
end
You could access CONSTANT from outside the module as SomeModule::InnerModule::MyClass::CONSTANT.
It doesn't affect instance methods defined on a class, since you access those with a different syntax (the dot .).
Relevant note: If you want to go back...
How to print to stderr in Python?
...
I found this to be the only one short + flexible + portable + readable:
from __future__ import print_function
import sys
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
The function eprint can be used in the same way as the standard print function:
>>> print(...
Assigning code to a variable
...nClick(OnButtonClick);
ButtonClicked(); // Execute the function.
}
From here, we can move to lambda expressions and see how they could be useful in your situation:
There are many delegates already defined by .NET libraries, with some like Action, which do not accept any parameter and does no...
“Parse Error : There is a problem parsing the package” while installing Android application
... Hi, I am facing a similar problem. I am downloading the application from a web link. It sits on the mobile SDCard perfectly. But when I am trying to install it is showing this error. I didn't sign my application, basically I am a newbie to Android app development. Help of any sort is apprecia...
background function in Python
...
I prefer to use gevent for this sort of thing:
import gevent
from gevent import monkey; monkey.patch_all()
greenlet = gevent.spawn( function_to_download_image )
display_message()
# ... perhaps interaction with the user here
# this will wait for the operation to complete (optional)
gr...
Color in git-log
...13), you can use %C(auto) to decorate %d in the format string of git log.
From the release notes:
* "git log --format" specifier learned %C(auto) token that tells Git
to use color when interpolating %d (decoration), %h (short commit
object name), etc. for terminal output.)
...
Why use strict and warnings?
...y, It would be better if we go into details, which I am specifiying below
From perl.com (my favourite):
use strict 'vars';
which means that you must always declare variables before you use them.
If you don't declare you will probably get error message for the undeclared variable
Global sy...