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What's so bad about Template Haskell?
...don't compile. You generated an expression that references a free variable foo that doesn't exist? Tough luck, you'll only see that when actually using your code generator, and only under the circumstances that trigger the generation of that particular code. It is very difficult to unit test, too.
...
Git stash uncached: how to put away all unstaged changes?
...each change before committing:
# ... hack hack hack ...
$ git add --patch foo # add just first part to the index
$ git stash save --keep-index # save all other changes to the stash
$ edit/build/test first part
$ git commit -m 'First part' # commit fully tested change
$ git stash p...
How do I get both STDOUT and STDERR to go to the terminal and a log file?
...stdout.txt ) 2> >(tee stderr.txt >&2 )
Here's a session:
$ foo=$(./example)
err
$ echo $foo
out
$ cat stdout.txt
out
$ cat stderr.txt
err
Here's how it works:
Both tee processes are started, their stdins are assigned to file descriptors. Because they're enclose...
Wrap a delegate in an IEqualityComparer
...an elegant solution (concept from Python's list sort method).
Usage:
var foo = new List<string> { "abc", "de", "DE" };
// case-insensitive distinct
var distinct = foo.Distinct(new KeyEqualityComparer<string>( x => x.ToLower() ) );
The KeyEqualityComparer class:
public class KeyE...
Comparing Java enum members: == or equals()?
... It's a black mark against Java that some people think that foo.equals(bar) is more readable than foo == bar
– Bennett McElwee
Jul 18 '12 at 5:20
19
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In C#, why is String a reference type that behaves like a value type?
... it's never desirable to check the references, since sometimes new String("foo"); and another new String("foo") can evaluate in the same reference, which kind of is not what you would expect a new operator to do. (Or can you tell me a case where I would want to compare the references?)
...
Is it possible to make a type only movable and not copyable?
...of a value is a byte copy:
let x: T = ...;
let y: T = x; // byte copy
fn foo(z: T) -> T {
return z // byte copy
}
foo(y) // byte copy
They are byte copies whether or not T moves or is "implicitly copyable". (To be clear, they aren't necessarily literally byte-by-byte copies at run-time: ...
Difference between len() and .__len__()?
...h case is which. (Sometimes an error slips in: until 2.5, you had to call foo.next() -- in 2.6, while that still works for backwards compatibility, you should call next(foo), and in 3.*, the magic method is correctly named __next__ instead of the "oops-ey" next!-).
So the general rule should be to...
How can I dynamically create derived classes from a base class
...g (anything?) to fill the gap would suffice. For example, obj = SubClass('foo') runs without error.
– DaveL17
Oct 3 '17 at 12:16
...
Calling Objective-C method from C++ member function?
...++ file be treated as Objective-C++. You can do this in xcode by renaming foo.cpp to foo.mm (.mm is the obj-c++ extension). Then as others have said standard obj-c messaging syntax will work.
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