大约有 19,602 项符合查询结果（耗时：0.0290秒） [XML]
Can I implement an autonomous `self` member type in C++?
...oo)
{
/* ... */
};
You can even do multiple inheritance with as many base classes as you want (thanks to variadic templates and variadic macros):
class WITH_SELF(Foo2)
{
/* ... */
};
class WITH_SELF_DERIVED(Bar2,Foo,Foo2)
{
/* ... */
};
I have verified this to work on gcc 4.8 and c...
How to rename a single column in a data.frame?
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How there not a wrapper function for this in base?
– ifly6
Sep 6 '18 at 17:03
1
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Is there a query language for JSON?
...or both together. And XPath 3.1 can too.
The list is growing:
JSONiq (based on XQuery)
UNQL (like SQL)
JaQL (functional)
JsonPath (XPath-like)
Json Query (sort of XPath-like)
GraphQL (template-based, typed)
share
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Algorithm to get the excel-like column name of a number
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Here's a nice simple recursive function (Based on zero indexed numbers, meaning 0 == A, 1 == B, etc)...
function getNameFromNumber($num) {
$numeric = $num % 26;
$letter = chr(65 + $numeric);
$num2 = intval($num / 26);
if ($num2 > 0) {
ret...
HTTP 401 - what's an appropriate WWW-Authenticate header value?
...n expiry when Basic Auth is used. I assume you're using some form of Forms based authentication.
From recollection, Windows Challenge Response uses a different scheme and different arguments.
The trick is that it's up to the browser to determine what schemes it supports and how it responds to them...
How to find all the subclasses of a class given its name?
I need a working approach of getting all classes that are inherited from a base class in Python.
10 Answers
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What is the difference between Caching and Memoization?
...cific form of caching that involves caching the return value of a function based on its parameters.
Caching is a more general term; for example, HTTP caching is caching but not memoization.
Wikipedia says:
Although related to caching, memoization refers to a specific case of this optimization...
NSOperation vs Grand Central Dispatch
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GCD is a low-level C-based API that enables very simple use of a task-based concurrency model. NSOperation and NSOperationQueue are Objective-C classes that do a similar thing. NSOperation was introduced first, but as of 10.5 and iOS 2, NSOperati...
Iterate over the lines of a string
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1000 loops, best of 3: 406 usec per loop
not quite as good as the .find based approach -- still, worth keeping in mind because it might be less prone to small off-by-one bugs (any loop where you see occurrences of +1 and -1, like my f3 above, should automatically trigger off-by-one suspicions -- ...
How to filter files when using scp to copy dir recursively?
.../me.class the problem is, there are many other useless files such as .svn-base files that i don't want. how can i filter them so I only scp .class files?
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