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Convert to/from DateTime and Time in Ruby
...ew_offset, :gm)
end
def to_local_time
to_time(new_offset(DateTime.now.offset-offset), :local)
end
private
def to_time(dest, method)
#Convert a fraction of a day to a number of microseconds
usec = (dest.sec_fraction * 60 * 60 * 24 * (10**6)).to_i
Time.send(method, dest.yea...
Fast way of counting non-zero bits in positive integer
...nd, gmpy popcount() took about 1/20th of the time of bin(n).count("1"). So if you can install gmpy, use that.
To answer a question in the comments, for bytes I'd use a lookup table. You can generate it at runtime:
counts = bytes(bin(x).count("1") for x in range(256)) # py2: use bytearray
Or jus...
Can I add jars to maven 2 build classpath without installing them?
...ggest you to either install the dependency to your local repository or specify a "system" scope in the pom and distribute the dependency with the source of your project. But both of these solutions are actually flawed.
Why you shouldn't apply the "Install to Local Repo" approach
When you install a d...
Best practices for Storyboard login screen, handling clearing of data upon logout
...ithOptions
//authenticatedUser: check from NSUserDefaults User credential if its present then set your navigation flow accordingly
if (authenticatedUser)
{
self.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController...
Getting the first and last day of a month, using a given DateTime object
...
I know I'm being picky here, but shouldn't lastDayofMonth be firstDayOfMonth.AddMonths(1).AddSeconds(-1);?
– Karl Gjertsen
Jan 5 '16 at 15:27
...
Bootstrap: how do I change the width of the container?
...Twitter Bootstrap to develop a website with the fixed container class, but now the client wants the website to be 1000px width and not 1170px. I don't use the .less files.
...
How to get list of all installed packages along with version in composer?
...
The '-i' option is now deprecated. composer show lists installed package by default.
– herve
Jul 21 '16 at 15:20
...
Difference between Destroy and Delete
What is the difference between
6 Answers
6
...
Rails find_or_create_by more than one attribute?
...ind_or_create_by_member_id_and_group_id(4, 7)
(use find_or_initialize_by if you don't want to save the record right away)
Edit: The above method is deprecated in Rails 4. The new way to do it will be:
GroupMember.where(:member_id => 4, :group_id => 7).first_or_create
and
GroupMember.whe...
Are there benefits of passing by pointer over passing by reference in C++?
...
A pointer can receive a NULL parameter, a reference parameter can not. If there's ever a chance that you could want to pass "no object", then use a pointer instead of a reference.
Also, passing by pointer allows you to explicitly see at the call site whether the object is passed by value or by ...