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Hardware projects from the 1990s and our revival and redesign starting in 2015 of that project and projects inspired by it. See the web page.
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QUESTION
I have an object of class Employee (let us call it Alice), and want to create a copy of this object (let us call it Alice_again) such that if I change Alice, the properties of Alice_again also changes. Basically creating a copy of an object whose properties are bound to the original.
Edits
I am having two diferent ObservableCollection of Employee(Employee is User Control) and both contains same object Employee and I want to display each ObservableCollection once. For that I am using ItemsControl and I have binded ItemsSource of ItemsControl to these ObservableCollection and as I have read on this link that a given object may only be present in a given logical tree once, so I am trying to create a copy of object but I don't want to update both copies whenever there is an update.
...ANSWER
Answered 2021-Jun-15 at 10:22You do not need to create a copy.
Since the elements in the ItemsSource collection are not supposed to be Visuals, two or more source collections may contain references to the same objects.
Two different UI elements in the ItemTemplate of two ItemsControl would hence legitimately bind to the same data item object.
QUESTION
the content of a.txt
...ANSWER
Answered 2021-Jun-14 at 04:43Because your $i
is only visible to bash
, not awk
. You need to pass it into your awk script as:
QUESTION
I have the following scenario
Table1
Row Col1 Col2 1 [12345, 32145, 647834] abcd 2 [23145, 11111, 12345] efg 3 [647834, 23145] zyx 4 [11111] cbaTable2
Row valuesforcol1 names 1 12345 Jon 2 32145 Bob 3 647834 Jack 4 23145 Dave 5 11111 AliceResult
Row Col1 Names 1 [12345, 32145, 647834] [Jon, Bob, Jack] 2 [23145, 11111, 12345] [Dave, Alice, Jon] 3 [647834, 23145] [Jack, Dave] 4 [11111] [Alice]How do I do that?
...ANSWER
Answered 2021-Jun-12 at 13:57If you were using BigQuery, then the logic would look like:
QUESTION
In an effort to create a Short, Self Contained, Correct (Compilable), Example, imagine that I want to do the following.
I have a blog website. There are two types of posts, TextPost
and LinkPost
. There are also two types of users, User
and Guest
. I would like to implement Multiple Table Inheritance with TextPost
and LinkPost
, by which I mean (hopefully I'm using the term correctly):
- At the model level, I will have
Post
,TextPost
andLinkPost
.TextPost
andLinkPost
will inherit fromPost
. - At the database level, I will have tables for the "leaf" models of
TextPost
andLinkPost
, but not forPost
.
Each type of Post
can belong to either a User
or a Guest
. So we have a polymorphic belongs_to
situation.
My question is how to accomplish these goals.
I tried the following, but it doesn't work.
...ANSWER
Answered 2021-Jun-12 at 04:58The names of constants look like the names of local variables, except that they begin with a capital letter.
All the built-in classes, along with the classes you define, have a corresponding global constant with the same name as the class called
class name
.
So in your case, when you define User
class, there's a constant class name
: User
, but not user
, that why the error NameError (wrong constant name user)
is raised.
try text_post = TextPost.create(title: 'foo', content: 'lorem ipsum', author_id: 1, author_type: 'User')
QUESTION
I'm new to PGP encryption and I'm trying to understand a problem I'm having. I have this public key (taken from some examples online)
...ANSWER
Answered 2021-Jun-11 at 17:35The error message explicitly tells you that the key that fails doesn't describe itself as suitable for encrypted storage or communications.
Per the signature subpacket specification, we know that this information lives in a subpacket of type 27.
Per the detailed specification on that subpacket, we know that the desired flags are 0x04 and 0x08, respectively.
To compare these keys, you can use gpg --list-packets --verbose
.
For the first, non-working key, we get:
QUESTION
I'm trying to build Bob and Alice asymmetric encryption and decryption implementation using RSACryptoServiceProvider
for that I have
- console app Bob (can consider as the sender)
- console app Alice (can consider as the receiver)
console app Bob can encrypt using its public key and then console app Alice can decrypt this using its private key
so this is Bob Console app
...ANSWER
Answered 2021-Jun-11 at 12:48The reason here is that you're constructing a public/private key pair in both applications.
Essentially you're trying to encrypt something with Bob's public key, and trying to decrypt that with Alice's private key. This won't work.
You need to construct 1 pair, and then use the public key from that pair for the encryption, and the private key from the same pair for the decryption.
This works:
QUESTION
I have a sorted vector of structures and I am trying to find the index of element that has the queried value in its member attribute. For this I am trying to use lower_bound, but I am having problems with the comparator lambda function. Here is a simplified version of my code:
...ANSWER
Answered 2021-Apr-29 at 11:34The comparator of std::lower_bound
is supposed to take the object dereferenced from the iterator, i.e. the element as the 1st parameter, the value to be compared as the 2nd parameter.
The type
Type1
must be such that an object of typeForwardIt
can be dereferenced and then implicitly converted toType1
. The typeType2
must be such that an object of typeT
can be implicitly converted toType2
.
You need to change the order of the parameters, e.g.
QUESTION
See here for a working example of my Google Sheet
See here to access my Google App Script for the Google Sheet
I have been working on a project that will be able to take the typed name of a place on Google Maps and then use the Places API and Place Details to pull in the associated information.
One bit of info I pull in is the open business hours, called the place.weekday_text
which comes in looking like this:
ANSWER
Answered 2021-Jun-08 at 20:42You already have your JSON data in a string, so you need to parse it into a JavaScript object (an array in your case):
QUESTION
I am reading at https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/data_stream_api/#examples-for-fromchangelogstream,
The EXAMPLE 1:
...ANSWER
Answered 2021-Jun-09 at 16:27The reason for the difference has two parts, both of them defined in GroupAggFunction
, which is the process function used to process this query.
The first is this part of the code:
QUESTION
Assume I have this:
...ANSWER
Answered 2021-Jun-09 at 15:24If you only have two pieces of information (name and total), I would suggest changing your schema a bit. Instead of a list of dictionaries, use a single dictionary where the keys are names and the values are totals:
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