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Verifying signed git commits?
...r key-id, as 32-bit key-id is so last century.
Linus's original was rebased to apply to the maintenance track just in case binary distributors that are stuck in the past want to take it to their older codebase.
Git 2.11+ (Q4 2016) will even be more precise.
See commit 661a180 (12 Oct 2016)...
What is the difference between bottom-up and top-down?
...t somewhere, with some particular subproblem, and perhaps may adapt itself based on the results of those evaluations. In the general sense of "dynamic programming", you might try to cache these subproblems, and more generally, try avoid revisiting subproblems with a subtle distinction perhaps being ...
Understanding __get__ and __set__ and Python descriptors
...lue. So you could imagine using it to map an attribute to a field in a database, for example – a kind of ORM.
Another use might be refusing to accept a new value by throwing an exception in __set__ – effectively making the "attribute" read only.
What is instance and owner here? (in __get__)...
What does the “yield” keyword do?
...appens with yield is significantly different than what happens in the list based approach. In many cases, the yield approach will be a lot more memory efficient and faster too. In other cases, this trick will get you stuck in an infinite loop, even though the original function works just fine. Read ...
Schema for a multilanguage database
...Method 4 (not listed):
Storing all the languages in a XML field in the database.
e.g
-- CREATE TABLE MyTable(myfilename nvarchar(100) NULL, filemeta xml NULL )
;WITH CTE AS
(
-- INSERT INTO MyTable(myfilename, filemeta)
SELECT
'test.mp3' AS myfilename
--,...
What's so bad about Template Haskell?
...nless the developer allows it; if you find a function that generates a database interface and a JSON serialization interface, you can't say "No, I only want the database interface, thanks; I'll roll my own JSON interface"
Run time. TH code takes a relatively long time to run. The code is interpreted...
内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
清单 9. 基本的引用计数函数
/* Structure Definitions*/
/* Base structure that holds a refcount */
struct refcountedstruct
{
int refcount;
}
/* All refcounted structures must mirror struct
* refcountedstruct for their first variables
*/
/* Refcount maintenance functions */...
Finding current executable's path without /proc/self/exe
...in/executable — relative to pwd
./foo — relative to pwd
executable — basename, find in path
bin//executable — relative to pwd, non-canonical
src/../bin/executable — relative to pwd, non-canonical, backtracking
bin/./echoargc — relative to pwd, non-canonical
Values you should not see:
...
The case against checked exceptions
...ramming bug if it attempts to fetch data from a nonexistent row. In a file-based operating system where any number of users/applications can add and delete files (an open system), it is conceivable that the file the client is requesting has been deleted without their knowledge so they should be expe...
Further understanding setRetainInstance(true)
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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