大约有 31,500 项符合查询结果（耗时：0.0576秒） [XML]
Class type check in TypeScript
...t's just checking if a object has a certain property. This may be nice for union types so works for this specific case, but its not really doable to create a "isThingy" for everything like this. Also if both fish and bird could swim you're doomed. I'm glad I'm using Haxe which has a reliable type ...
Visual Studio support for new C / C++ standards?
...and literals. C99 math library functions. Named initializers for structs/unions. The restrict keyword. There are a ton of great C99 features that are missing from C++, and they are features that I use every day as a C programmer.
– Stephen Canon
Apr 14 '11 ...
static const vs #define
...d into which they should be packed if the enum is a member of struct/class/union), while C++11 defaults to int but can be explicitly set by the programmer
can't take the address - there isn't one as the enumeration values are effectively substituted inline at the points of usage
stronger usage restr...
Are soft deletes a good idea? [duplicate]
...iew called recycle_bin or similar that shows only deleted records (doing a union on tables that do soft deletes on their common fields)
– Neil McGuigan
Jan 29 '12 at 10:25
2
...
How to add icon inside EditText view in Android ?
...lation is against the law in many countries for example in whole European Union so please be carefull :)
– Paweł Byszewski
Dec 5 '14 at 8:50
add a comment
...
XPath to select multiple tags
..., or is a logical operator -- it operates on two Boolean values. The XPath union operator | operates on two sets of nodes. These are quite different and there are specific use cases for each of them. Using | can solve the original problem, but it results in a longer and more complex and challenging ...
How to merge dictionaries of dictionaries?
... generators:
def mergedicts(dict1, dict2):
for k in set(dict1.keys()).union(dict2.keys()):
if k in dict1 and k in dict2:
if isinstance(dict1[k], dict) and isinstance(dict2[k], dict):
yield (k, dict(mergedicts(dict1[k], dict2[k])))
else:
...
Why doesn't Java Map extend Collection?
...the element appears in the bag).
This structure would allow intersection, union etc. of a range of "collections". Hence, the hierarchy should be:
Set
|
Relation
|
...
MySql Table Insert if not exist otherwise update
...)
and hash_id in (select id from hashes where name=[hash_name])
union
select 0, m.id, h.id, [new_value]
from hashers m cross join hashes h
where m.name=[hasher_name]
and h.name=[hash_name]) l
limit 1;
This example is cribbed from one of my databases, with the ...
Facebook database design?
... select friend_id
from friends
where user_id = 1
) union (
select distinct ff.friend_id
from
friends f
join friends ff on ff.user_id = f.friend_id
where f.user_id = 1
)
I really recommend you to create you some sample data...