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What is unit testing and how do you do it? [duplicate]
...
Unit testing involves breaking your program into pieces, and subjecting each piece to a series of tests.
Usually tests are run as separate programs, but the method of testing varies, depending on the language, and type of software (GUI, command-line, library).
Most ...
How do I get SUM function in MySQL to return '0' if no values are found?
...ture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
val INT
);
INSERT INTO foo (val) VALUES
(null),(1),(null),(2),(null),(3),(null),(4),(null),(5),(null),(6),(null);
CREATE TABLE bar
(
id INT NOT NULL AUTO_INCREMENT PRIMARY K...
How do you access command line arguments in Swift?
...n CommandLine.arguments {
switch argument {
case "arg1":
print("first argument")
case "arg2":
print("second argument")
default:
print("an argument")
}
}
share
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405 method not allowed Web API
...]
[ResponseType(typeof(Scan))]
public IHttpActionResult DeleteScan(int id)
{
Scan scan = db.Scans.Find(id);
if (scan == null)
{
return NotFound();
}
db.Scans.Remove(scan);
db.SaveChanges();
return Ok(scan);
}
...
How to test equality of Swift enums with associated values
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Swift 4.1+
As @jedwidz has helpfully pointed out, from Swift 4.1 (due to SE-0185, Swift also supports synthesizing Equatable and Hashable for enums with associated values.
So if you're on Swift 4.1 or newer, the following will automatically synthesize the necessa...
Git push error '[remote rejected] master -> master (branch is currently checked out)'
...
You can simply convert your remote repository to bare repository (there is no working copy in the bare repository - the folder contains only the actual repository data).
Execute the following command in your remote repository folder:
git ...
C/C++ Struct vs Class
...o fake some OOP in C—for instance, defining functions which all take a pointer to a struct as their first parameter, or occasionally coercing structs with the same first few fields to be "sub/superclasses"—it's always sort of bolted on, and isn't really part of the language.
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Why isn't std::initializer_list a language built-in?
...ed in the std namespace. typeid returns std::type_info and (stretching a point perhaps) sizeof returns std::size_t.
In the former case, you already need to include a standard header in order to use this so-called "core language" feature.
Now, for initializer lists it happens that no keyword is nee...
How can I extend typed Arrays in Swift?
... For example, sorting a typed array:
class HighScoreEntry {
let score:Int
}
extension Array where Element == HighScoreEntry {
func sort() -> [HighScoreEntry] {
return sort { $0.score < $1.score }
}
}
Trying to do this with a struct or typealias will give an error:
Type '...
Should I use static_cast or reinterpret_cast when casting a void* to whatever
... fact that every use of reinterpret_cast is downright dangerous because it converts anything to anything else really (for pointers), while static_cast is much more restrictive, thus providing a better level of protection. This has already saved me from bugs where I accidentally tried to coerce one p...