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Is it better to use std::memcpy() or std::copy() in terms to performance?
...r was std::copy.
I wrote a C++ SHA-2 implementation. In my test, I hash 5 strings using all four SHA-2 versions (224, 256, 384, 512), and I loop 300 times. I measure times using Boost.timer. That 300 loop counter is enough to completely stabilize my results. I ran the test 5 times each, alternating...
How do I check if there are duplicates in a flat list?
...of the number of items in the list!
For longer lists with hashable items (strings, numbers, &c):
def anydup(thelist):
seen = set()
for x in thelist:
if x in seen: return True
seen.add(x)
return False
If your items are not hashable (sublists, dicts, etc) it gets hairier, though ...
Remove all occurrences of char from string
...
Try using the overload that takes CharSequence arguments (eg, String) rather than char:
str = str.replace("X", "");
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How to remove all the occurrences of a char in c++ string
...use boost if that's an option for you, like:
#include <boost/algorithm/string.hpp>
boost::erase_all(str, "a");
All of this is well-documented on reference websites. But if you didn't know of these functions, you could easily do this kind of things by hand:
std::string output;
output.reserv...
How to calculate the bounding box for a given lat/lng location?
... there is a bad code in your C# variant, for e.g.: public override string ToString(), it's very bad to override such a global method only for one purpose, better just to add another method, then overriding standard method, which can be used in other parts of application, not for the gis exac...
ActiveModel::ForbiddenAttributesError when creating new user
...ile_phone, :work_phone]
end
The form will pass say a radio selector as a string param. That's what happened in my case. The simple fix is to change enum to strings instead of symbols
enum preferred_phone: %w[home_phone mobile_phone work_phone]
# or more verbose
enum preferred_phone: ['home_phone'...
What is the “owning side” in an ORM mapping?
...we want is only a foreign key on table ID_DOCUMENTS towards PERSONSand the extra association table.
To solve this we need to configure Hibernate to stop tracking the modifications on relation Person.idDocuments. Hibernate should only track the other side of the relation IdDocument.person, and to do...
Force CloudFront distribution/file update
...HTTP/1.0
Host: cloudfront.amazonaws.com
Authorization: [AWS authentication string]
Content-Type: text/xml
<InvalidationBatch>
<Path>/image1.jpg</Path>
<Path>/image2.jpg</Path>
<Path>/videos/movie.flv</Path>
<CallerReference>my-batch</Ca...
Adding git branch on the Bash command prompt
...t basic usage is:
$ __git_ps1
(master)
It also takes an optional format string:
$ __git_ps1 'git:[%s]'
git:[master]
How to Get It
First, copy the file to somewhere (e.g. ~/.git-prompt.sh).
Option 1: use an existing copy on your filesystem. Example (Mac OS X 10.15):
$ find / -name 'git-prom...
How do I change the color of the text in a UIPickerView under iOS 7?
...in the delegate method that is more elegant:
Objective-C:
- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
NSString *title = @"sample title";
NSAttributedString *attString =
[[NSAttributedString ...