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Synchronization vs Lock
...ization ensures fair or FIFO allocation of the lock. Using
synchronized(foo) {
}
or
lock.acquire(); .....lock.release();
does not assure fairness.
If you have lots of contention for the lock you can easily encounter barging where newer requests get the lock and older requests get stuck. I'...
Automapper - how to map to constructor parameters instead of property setters
...nstructUsing((src, res) =>
{
return new ToType(
foo: src.MyFoo,
bar: res.Mapper.Map<BarModel>(src.MyBar),
);
});
Note the Func's 2nd parameter res which is the Resolution Context. This parameter allows you to use already registered mappings.
...
What is the difference between String and string in C#?
...xplicitly specifying an enum's underlying type. For instance:
public enum Foo : UInt32 {} // Invalid
public enum Bar : uint {} // Valid
That's just a matter of the way the spec defines enum declarations - the part after the colon has to be the integral-type production, which is one token of sby...
How to create a custom string representation for a class object?
...
class foo(object):
def __str__(self):
return "representation"
def __unicode__(self):
return u"representation"
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How to exclude certain directories/files from git grep search
... "magic word" exclude was added to pathspecs. So if you want to search for foobar in every file except for those matching *.java you can do:
git grep foobar -- './*' ':(exclude)*.java'
Or using the ! "short form" for exclude:
git grep foobar -- './*' ':!*.java'
Note that in git versions up to ...
Posting a File and Associated Data to a RESTful WebService preferably as JSON
...xyz
Content-Type: image/jpeg
[image data]
[image data]
[image data]
...
--foo_bar_baz--
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Is an array name a pointer?
...its name represents the whole array.
int arr[7];
/* arr used as value */
foo(arr);
int x = *(arr + 1); /* same as arr[1] */
/* arr not used as value */
size_t bytes = sizeof arr;
void *q = &arr; /* void pointers are compatible with pointers to any object */
...
How to get current path with query string using Capybara
...rrent_url might contain a port number. E.g. given a current_url of http://foo.com:8888/some/path, current_url[current_host.size..-1] will equal :8888/some/path. Also, behind the scenes current_host does the same sort of URI.parse logic that @nzifnab recommended in the accepted answer.
...
CSS Selector “(A or B) and C”?
...
If you have this:
<div class="a x">Foo</div>
<div class="b x">Bar</div>
<div class="c x">Baz</div>
And you only want to select the elements which have .x and (.a or .b), you could write:
.x:not(.c) { ... }
but that's convenie...
How does the new automatic reference counting mechanism work?
...: the equivalent of manual cleanup in ARC is manual breaking of cycles, eg foo = nil.
– Douglas
May 11 '12 at 23:42
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