大约有 45,000 项符合查询结果（耗时：0.0520秒） [XML]
Why is “using namespace std;” considered bad practice?
I've been told by others that writing using namespace std; in code is wrong, and that I should use std::cout and std::cin directly instead.
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Safe (bounds-checked) array lookup in Swift, through optional bindings?
...er, I've happened to stumble on a nicer way of implementing this functionality:
Swift 3.2 and newer
extension Collection {
/// Returns the element at the specified index if it is within bounds, otherwise nil.
subscript (safe index: Index) -> Element? {
return indices.contains(i...
Why does PHP 5.2+ disallow abstract static class methods?
...w a load of strict standards warnings from a project that was originally written without strict warnings:
8 Answers
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What are the differences between type() and isinstance()?
... the contents of other (already good!) answers, isinstance caters for inheritance (an instance of a derived class is an instance of a base class, too), while checking for equality of type does not (it demands identity of types and rejects instances of subtypes, AKA subclasses).
Normally, in Python,...
Why is try {…} finally {…} good; try {…} catch{} bad?
I have seen people say that it is bad form to use catch with no arguments, especially if that catch doesn't do anything:
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Can Google Chrome open local links?
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You can't link to file:/// from an HTML document that is not itself a file:/// for security reasons.
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Calculate a Running Total in SQL Server
...em is that the SQL Server implementation of the Over clause is somewhat limited.
Oracle (and ANSI-SQL) allow you to do things like:
SELECT somedate, somevalue,
SUM(somevalue) OVER(ORDER BY somedate
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS RunningTotal
FROM Table...
Why aren't python nested functions called closures?
I have seen and used nested functions in Python, and they match the definition of a closure. So why are they called nested functions instead of closures ?
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Can I use a :before or :after pseudo-element on an input field?
... am trying to use the :after CSS pseudo-element on an input field, but it does not work. If I use it with a span , it works OK.
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Stop setInterval call in JavaScript
...rval(fname, 10000); to call a function every 10 seconds in JavaScript. Is it possible to stop calling it on some event?
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