大约有 6,800 项符合查询结果（耗时：0.0177秒） [XML]
$on and $broadcast in angular
...ns but the one we're going to use is using $broadcast and $on.
$broadcast vs $emit
Which should we use? $broadcast will channel down to all the children dom elements and $emit will channel the opposite direction to all the ancestor dom elements.
The best way to avoid deciding between $emit or ...
Is there a way to instantiate objects from a string holding their class name?
... Originally posted by somedave in another question, this code fails on VS2010 with ambiguous template errors because of make_pair. To fix, change make_pair to std::pair<std::string,Base*()()> and it should fix those errors. I also got some linking errors which were fixed by adding BaseFact...
How to create module-wide variables in Python? [duplicate]
...use 'global' in initialize_db. Can you comment on the pros/cons of global vs. your answer, since they both seem to work the same?
– Alain Collins
Dec 12 '16 at 17:57
...
How to check if a table exists in a given schema
...ble_name'
);
Related answer on dba.SE discussing "Information schema vs. system catalogs"
Alternative: cast to regclass
SELECT 'schema_name.table_name'::regclass
This raises an exception if the (optionally schema-qualified) table (or other object occupying that name) does not exist.
If y...
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
...
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...