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How can I output the value of an enum class in C++11
...will work for any scoped enum. The solution employs SFINAE via std::enable_if and is as follows.
#include <iostream>
#include <type_traits>
// Scoped enum
enum class Color
{
Red,
Green,
Blue
};
// Unscoped enum
enum Orientation
{
Horizontal,
Vertical
};
// Another...
SVN undo delete before commit
If you delete a directory from an SVN working copy, but haven't committed yet, it's not obvious how to get it back. Google even suggests "svn undo delete before commit" as a common query when you type "svn undo d", but the search results are unhelpful.
...
ContextLoaderListener or not?
...'s no reason to keep the ContextLoaderListener and applicationContext.xml. If your app works fine with just the servlet's context, that stick with that, it's simpler.
Yes, the generally-encouraged pattern is to keep non-web stuff in the webapp-level context, but it's nothing more than a weak conven...
How to get visitor's location (i.e. country) using geolocation? [duplicate]
...
You don't need to locate the user if you only need their country. You can look their IP address up in any IP-to-location service (like maxmind, ipregistry or ip2location). This will be accurate most of the time.
If you really need to get their location, you ...
How can you determine how much disk space a particular MySQL table is taking up?
...pw3),2),' ',SUBSTR(units,pw3*2+1,2)) TBLSIZE
FROM
(
SELECT DAT,NDX,TBL,IF(px>4,4,px) pw1,IF(py>4,4,py) pw2,IF(pz>4,4,pz) pw3
FROM
(
SELECT data_length DAT,index_length NDX,data_length+index_length TBL,
FLOOR(LOG(IF(data_length=0,1,data_length))/LOG(1024)) px,
...
Getting unique items from a list [duplicate]
...<T> of distinct items:
var uniqueItems = yourList.Distinct();
And if you need the sequence of unique items returned as a List<T>, you can add a call to ToList:
var uniqueItemsList = yourList.Distinct().ToList();
...
How to print a debug log?
...d also suggest using var_export($foo, true) instead of print_r($foo, true) if print_rdoesn't get you the type information you need.
– Ben
Dec 14 '17 at 17:08
...
How to remove “onclick” with JQuery?
..."alert('get rid of this')" href="javascript:void(0)" class="black">Qualify</a>
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Implications of foldr vs. foldl (or foldl')
...or foldl f x ys looks like
f (... (f (f x y1) y2) ...) yk
An important difference here is that if the result of f x y can be computed using only the value of x, then foldr doesn't' need to examine the entire list. For example
foldr (&&) False (repeat False)
returns False whereas
fold...
How can I pass command-line arguments to a Perl program?
...
Depends on what you want to do. If you want to use the two arguments as input files, you can just pass them in and then use <> to read their contents.
If they have a different meaning, you can use GetOpt::Std and GetOpt::Long to process them easily. ...