大约有 531 项符合查询结果（耗时：0.0173秒） [XML]
A fast method to round a double to a 32-bit int explained
... but will keep and propagate the sign to the entire 64-bit signed integer. union { double d; int64_t l; } magic; magic.d = input + 6755399441055744.0; magic.l <<= 13; magic.l >>= 13;
– Wojciech Migda
May 13 '16 at...
Concurrent HashSet in .NET Framework?
...cky part about making an ISet<T> concurrent is that the set methods (union, intersection, difference) are iterative in nature. At the very least you have to iterate over all n members of one of the sets involved in the operation, while locking both sets.
You lose the advantages of a Concur...
Is the “struct hack” technically undefined behavior?
...n the above trick for getting the right size, you might also need to put a union containing every simple type before the array, to ensure that the array itself begins with maximal alignment rather than in the middle of some other element's padding. Again, I don't believe any of this is necessary, bu...
PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
...context I recommend to use one db with multiple schemas, as you can (e.g.) UNION ALL across schemas, but not across databases. For that reason, a database is really completely insulated from another database while schemas are not insulated from other schemas within the same database.
If you -for so...
How do I iterate over an NSArray?
...efault will change to GNU99, which (among other things) supports anonymous unions and structs. That should be nice...
– Quinn Taylor
Jun 15 '09 at 4:13
2
...
How to generate keyboard events in Python?
...", wintypes.WORD))
class INPUT(ctypes.Structure):
class _INPUT(ctypes.Union):
_fields_ = (("ki", KEYBDINPUT),
("mi", MOUSEINPUT),
("hi", HARDWAREINPUT))
_anonymous_ = ("_input",)
_fields_ = (("type", wintypes.DWORD),
("_i...
Is there a way to instantiate objects from a string holding their class name?
...td::string, variant_type (*)()> map_type;
A boost::variant is like an union. It knows which type is stored in it by looking what object was used for initializing or assigning to it. Have a look at its documentation here. Finally, the use of a raw function pointer is also a bit oldish. Modern C+...
No == operator found while comparing structs in C++
...d be compared (is there a size somewhere or a sentinel?)
which member of a union to compare
normalisation: for example, date types may allow out-of-range day-of-month or month-of-year, or a rational/fraction object may have 6/8ths while another has 3/4ers, which for performance reasons they correct ...
Under what circumstances are linked lists useful?
...s contained within the object that's a list element - whether as part of a union (in C terms) or not. Point 3 only applies in languages that let you do it - C, C++, assembler good. Java bad.
– Steve Jessop
Mar 12 '10 at 1:01
...
How to port data-only volumes from one host to another?
...eir data with minimal downtime. Cargo uses data federation capabilities of union filesystem to create a unified view of data (mainly the root file system) across the source and target hosts. This allows Cargo to start up a container almost immediately (within milliseconds) on the target host as the ...