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Using the field of an object as a generic Dictionary key
...des, as it often leads to a lot of diagonal collisions (i.e. {"foo","bar"} vs {"bar","foo"}. A better choice is to multiply and add each term - i.e. 17 * a.GetHashCode() + B.GetHashCode();
– Marc Gravell♦
Mar 11 '09 at 15:02
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No == operator found while comparing structs in C++
...r, list), and if so whether it's ok to sort them in-place before comparing vs. using extra memory to sort temporaries each time a comparison is done
how many array elements currently hold valid values that should be compared (is there a size somewhere or a sentinel?)
which member of a union to compa...
Using Java 8's Optional with Stream::flatMap
...olve(t)))
.findFirst();
COMMENTARY
Let's compare the original vs modified versions directly:
// original
.flatMap(o -> o.isPresent() ? Stream.of(o.get()) : Stream.empty())
// modified
.flatMap(o -> o.map(Stream::of).orElseGet(Stream::empty))
The original is a straightforward i...
Can we define implicit conversions of enums in c#?
...ig ready-to-roll to compare the two approaches for operators with dynamic (vs generics/Expression) when it gets there.
– Marc Gravell♦
Nov 4 '08 at 12:45
...
What is the best way to deal with the NSDateFormatter locale “feechur”?
... format will be used.
This means UI is driven by user preferences (am/pm vs 24 hour, and date strings formatted correctly to user choice - from iOS settings), whereas dates that are "coming into" your app are always being "parsed" correctly to an NSDate for you to use.
...
What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
...
Table relationships vs. entity relationships
In a relational database system, there can be only three types of table relationships:
one-to-many (via a Foreign Key column)
one-to-one (via a shared Primary Key)
many-to-many (via a link table wi...
Why use symbols as hash keys in Ruby?
... value look ups since hashing a symbol is equivalent to hashing an integer vs hashing a string.
Disadvantage: consumes a slot in the program's symbol table that is never released.
share
|
improve t...
How can I pass selected row to commandLink inside dataTable or ui:repeat?
...nversion, use <f:viewParam> on the target view, see also f:viewParam vs @ManagedProperty:
<f:viewParam name="id" value="#{bean.id}" required="true" />
Either way, this has the advantage that the datamodel doesn't necessarily need to be preserved for the form submit (for the case that y...
What kind of leaks does automatic reference counting in Objective-C not prevent or minimize?
...am eager to see how they behave under ARC.
For more on garbage collection vs. ARC, see this very interesting response by Chris Lattner on the Objective-C mailing list, where he lists many advantages of ARC over Objective-C 2.0 garbage collection. I've run into several of the GC issues he describes...
What is a “callback” in C and how are they implemented?
...ion at https://msdn.microsoft.com/en-us/library/windows/desktop/ms737526(v=vs.85).aspx
This application starts a listen() on the local host, 127.0.0.1, using port 8282 so you could use either telnet 127.0.0.1 8282 or http://127.0.0.1:8282/.
This sample application was created as a console applicat...