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How should one use std::optional?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
A migration to add unique constraint to a combination of columns
...ship.create!(user_id: user_id, post_id: post_id)
Fully runnable example: https://gist.github.com/Dorian/9d641ca78dad8eb64736173614d97ced
db/schema.rb generated: https://gist.github.com/Dorian/a8449287fa62b88463f48da986c1744a
...
Why is WinRT unmanaged? [closed]
... use WinRT without jumping through the hoops that C++/CLI introduces ( see http://www2.research.att.com/~bs/bs_faq.html#CppCLI ) It does mean though that you will still have to study COM if you want to use WinRT.
The real question is 'why is COM necessary? why did Microsoft have to invent it?' B...
Explaining Python's '__enter__' and '__exit__'
...r__ and __exit__ methods by Googling, so to help others here is the link:
https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers
https://docs.python.org/3/reference/datamodel.html#with-statement-context-managers
(detail is the same for both versions)
object.__enter__...
Creating a singleton in Python
...ion of a class means and how to implement that definition. See for example http://code.activestate.com/recipes/498149/, which essentially recreates C-style structs in Python using metaclasses. The thread What are some (concrete) use-cases for metaclasses? also provides some examples, they generally ...
Rails detect if request was AJAX
...est.xhr?
Returns true if the “X-Requested-With” header contains “XMLHttpRequest”....
But BEWARE that
request.xhr?
returns numeric or nil values not BOOLEAN values as the docs say, in accordance with =~.
irb(main):004:0> /hay/ =~ 'haystack'
=> 0
irb(main):006:0> /stack/ =~ '...
@RequestParam vs @PathVariable
...ng request parameters to method parameters with @RequestParam
If the URL http://localhost:8080/MyApp/user/1234/invoices?date=12-05-2013 gets the invoices for user 1234 on December 5th, 2013, the controller method would look like:
@RequestMapping(value="/user/{userId}/invoices", method = RequestMe...
Python time measure function
... need is to wrap your function up using decorators. More explanation here: http://www.pythoncentral.io/time-a-python-function/
The only case where you might be interested in writing your own timing statements is if you want to run a function only once and are also want to obtain its return value.
...
Can I have an onclick effect in CSS?
...d="btnControl"/>
<label class="btn" for="btnControl"><img src="https://placekitten.com/200/140" id="btnLeft" /></label>
With that being said, there is some bad news. Because a label can only be associated with one form control at a time, that means you can't just drop a bu...
If REST applications are supposed to be stateless, how do you manage sessions?
...
Statelessness means that every HTTP request happens in complete isolation. When the client makes an HTTP request, it includes all the information necessary for the server to fulfill that request. The server never relies on information from previous request...