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Swift - class method which must be overridden by subclass
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Con: The "superclass" (protocol) cannot implement methods or properties
2. Assert in the super version of the method
Example:
class SuperClass {
func someFunc() {
fatalError("Must Override")
}
}
class Subclass : SuperClass {
override func someFunc() {
}
}
Pro: Can imp...
How do I get the entity that represents the current user in Symfony2?
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210
Symfony 4+, 2019+ Approach
In symfony 4 (probably 3.3 also, but only real-tested in 4) you ca...
How do I limit the number of results returned from grep?
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249
The -m option is probably what you're looking for:
grep -m 10 PATTERN [FILE]
From man grep:...
Trying to start a service on boot on Android
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edited May 2 '17 at 7:42
Benoit Duffez
9,1201010 gold badges6565 silver badges113113 bronze badges
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Postgresql aggregate array
...nt name on GROUP BY.
CREATE TABLE grade
(Student_id int, Mark varchar(2));
INSERT INTO grade
(Student_id, Mark)
VALUES
(1, 'A'),
(2, 'B'),
(2, 'B+'),
(3, 'C'),
(3, 'A');
CREATE TABLE student
(Id int primary key, Name varchar(5));
INSERT INTO student
(Id, Name...
What should main() return in C and C++?
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edited Nov 23 '19 at 9:21
Community♦
111 silver badge
answered Oct 15 '08 at 12:16
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Check if character is number?
I need to check whether justPrices[i].substr(commapos+2,1) .
22 Answers
22
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Find first element in a sequence that matches a predicate
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260
To find first element in a sequence seq that matches a predicate:
next(x for x in seq if pred...
Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions prop
I have developed an application using Entity Framework , SQL Server 2000, Visual Studio 2008 and Enterprise Library.
35 ...
string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
...ractice is selecting the most appropriate one.
.Net Framework 4.0 Beta 2 has a new IsNullOrWhiteSpace() method for
strings which generalizes the IsNullOrEmpty() method to also include other white
space besides empty string.
The term “white space” includes all characters that are not...