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Is Java Regex Thread Safe?
...rrent threads. Instances of the Matcher class are not safe for such use.
If you are looking at performance centric code, attempt to reset the Matcher instance using the reset() method, instead of creating new instances. This would reset the state of the Matcher instance, making it usable for the n...
Pythonic way to find maximum value and its index in a list?
If I want the maximum value in a list, I can just write max(List) , but what if I also need the index of the maximum value?
...
How do I move a single folder from one Subversion repository to another repository?
...
If you have access the repository itself (not a working copy), you should be able to dump the current repository, filter it to only include information about the docs folder, and load it into the other repository.
Would be s...
Benefits of header-only libraries
...s.
Having a header-only library also means you don't have to worry about different platforms where the library might be used. When you separate the implementation, you usually do so to hide implementation details, and distribute the library as a combination of headers and libraries (lib, dll's or ....
Get top n records for each group of grouped results
...s, using UNION ALL (See SQL Fiddle with Demo). This works with two groups, if you have more than two groups, then you would need to specify the group number and add queries for each group:
(
select *
from mytable
where `group` = 1
order by age desc
LIMIT 2
)
UNION ALL
(
select *
from...
Why implement interface explicitly?
...
If you implement two interfaces, both with the same method and different implementations, then you have to implement explicitly.
public interface IDoItFast
{
void Go();
}
public interface IDoItSlow
{
void Go();
}
pub...
Window vs Page vs UserControl for WPF navigation?
...eb-based systems like an XBAP, where you have a single browser window and different pages can be hosted in that window. It can also be used in Navigation Applications like sellmeadog said.
A UserControl is a reusable user-created control that you can add to your UI the same way you would add any ot...
Storing SHA1 hash values in MySQL
...es just 4 bit per character and thus would need 160/4 = 40 characters. But if you use 8 bit per character, you would only need a 160/8 = 20 character long field.
So I recommend you to use BINARY(20) and the UNHEX function to convert the SHA1 value to binary.
I compared storage requirements for BIN...
The type or namespace name 'Objects' does not exist in the namespace 'System.Data'
...
It worked! Curious, if the System.Data.objects namespace is indeed present within the System.Data.Entity?
– pencilslate
Aug 13 '09 at 22:51
...
Why declare a struct that only contains an array in C?
...nst-reference, unless the callee already needs a tmp copy it can destroy. If the call / return don't optimize away, a medium to large array (thousands of bytes) is a terrible thing to pass by value.
– Peter Cordes
Jun 11 '18 at 16:49
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