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C++ preprocessor __VA_ARGS__ number of arguments
...GS__})/sizeof(int))
Full example:
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#define NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int))
#define SUM(...) (sum(NUMARGS(__VA_ARGS__), __VA_ARGS__))
void sum(int numargs, ...);
int main(int argc, char *argv[]...
Convert datetime object to a String of date only in Python
I see a lot on converting a date string to an datetime object in Python, but I want to go the other way.
I've got
11 A...
python design patterns [closed]
...ttributes."
return self
def __repr__(self):
"Return a string representation."
return "<Null>"
def __str__(self):
"Convert to a string and return it."
return "Null"
With this, if you do Null("any", "params", "you", "want").attribute_that_doesn...
Cost of len() function
What is the cost of len() function for Python built-ins? (list/tuple/string/dictionary)
5 Answers
...
Sort a list by multiple attributes?
...t one ascending and the second one descending? (Assume both attributes are strings, so no hacks like adding - for integers)
– Martin Thoma
Aug 5 '13 at 11:03
...
Spring Data: “delete by” is supported?
...elete from User u where u.firstName = ?1")
void deleteUsersByFirstName(String firstName);
}
Update:
In modern versions of Spring Data JPA (>=1.7.x) query derivation for delete, remove and count operations is accessible.
public interface UserRepository extends CrudRepository<User, Long&...
What are POD types in C++?
...
With the exception of a string because you can't copy it with memcpy without first determining the string length.
– user2356685
May 25 '18 at 3:51
...
How to set ViewBag properties for all Views without using a base class for Controllers?
...nother way
Creating an extension method on HtmlHelper
[Extension()]
public string MyTest(System.Web.Mvc.HtmlHelper htmlHelper)
{
return "This is a test";
}
Then you can use it in all views
@Html.MyTest()
share
...
what is the difference between a portlet and a servlet?
... effect from normal servets (See Struts + Tiles for an example of how) the extra bit from the portlets is that the portlets are in a richer environment provided by the Portal, extra APIs are provided so that what is displayed by any portlet can be configured by individual users to their preferences,...
bash assign default value
...riable without needing to reassign
# colons suppress attempting to run the string
unset EGGS
: ${EGGS=spam}
echo 1 $EGGS # 1 spam
unset EGGS
: ${EGGS:=spam}
echo 2 $EGGS # 2 spam
EGGS=
: ${EGGS=spam}
echo 3 $EGGS # 3 (set, but blank -> leaves alone)
EGGS=
: ${EGGS:=spam}
echo ...