大约有 3,285 项符合查询结果（耗时：0.0161秒） [XML]
Difference between 'struct' and 'typedef struct' in C++?
...r to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add a typedef:
struct Foo { ... };
typedef struct Foo Foo;
Now struct Foo (in the tag namespace) and just plain Foo (in the ordinary identifier namespace) both refer to the same thing, and you can freely d...
Why are quaternions used for rotations?
...age in size (4 scalars vs. 9) and speed (quaternion multiplication is much faster than 3x3 matrix multiplication).
Note that all of these representations of rotations are used in practice. Euler angles use the least memory; matrices use more memory but don't suffer from Gimbal lock and have nice an...
How can I ensure that a division of integers is always rounded up?
...h my final answer is perhaps not as 'simple' or 'obvious' or perhaps even 'fast' as the floating point answers, it has one very strong redeeming quality for me; I have now reasoned through the answer, so I am actually certain it is correct (until someone smarter tells me otherwise -furtive glance in...
MySQL indexes - what are the best practices?
...ead efficiency and write efficiency. With no indexes, inserts can be very fast -- the database engine just adds a row to the table. As you add indexes, the engine must update each index while performing the insert.
On the other hand, reads become a lot faster.
Hopefully that covers your first ...
How do I make calls to a REST api using C#?
...n clients:
ServiceStack.Text (1k github stars, 7m Nuget downloads) (*) - fast, light and resilient.
RestSharp (6k github stars, 23m Nuget Downloads) (*) - simple REST and HTTP API Client
Flurl (1.7k github stars, 3m Nuget Downloads) (*)- a fluent, portable, testable HTTP client library
All the...
Best way to compare two complex objects
...ously require you to extend your types’ definitions, but its results are faster than any generic solutions involving serialization.
Edit: Here is a contrived example with three levels of nesting.
For value types, you can typically just call their Equals method. Even if the fields or properties ...
When are you truly forced to use UUID as part of the design?
...lly secure random number generator. If two UUIDs are generated in sequence fast enough that the timestamp matches the previous UUID, the timestamp is incremented by 1. Collisions should not occur unless one of the following happens: The MAC address is spoofed; One machine running two different UUID ...
Undo a merge by pull request?
...st, and you will see your own commits, and a merge commit (if it was not a fast-forward merge). You just have to find the last of your own commits before the merge, and reset the branch to this commit.
(If you have the branch's reflog, it should be even easier to find the commit before the merge.)
...
When to use a key/value store such as Redis instead/along side of a SQL database?
...
@TonyLin It's both, it's fast because it's in-memory and because Redis also has a pretty good implementation of cutting edge data models to help it do its work as best as it can.
– zenw0lf
Sep 2 '19 at 4:04
...
What is the difference between `sorted(list)` vs `list.sort()`?
...t something that is an iterable, not a list yet.
For lists, list.sort() is faster than sorted() because it doesn't have to create a copy. For any other iterable, you have no choice.
No, you cannot retrieve the original positions. Once you called list.sort() the original order is gone.
...