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Iterate keys in a C++ map

...te on the keys instead of the pairs), then take a look at Boost's transform_iterator. [Tip: when looking at Boost documentation for a new class, read the "examples" at the end first. You then have a sporting chance of figuring out what on earth the rest of it is talking about :-)] ...
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What's a good rate limiting algorithm?

...sages per = 8.0; // unit: seconds allowance = rate; // unit: messages last_check = now(); // floating-point, e.g. usec accuracy. Unit: seconds when (message_received): current = now(); time_passed = current - last_check; last_check = current; allowance += time_passed * (rate / per); if (...
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Python: Tuples/dictionaries as keys, select, sort

...u wish. For this case, I'd use the following class: class Fruit: def __init__(self, name, color, quantity): self.name = name self.color = color self.quantity = quantity def __str__(self): return "Name: %s, Color: %s, Quantity: %s" % \ (self.name, self...
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如何查看Oracle用户的SQL执行历史记录? - 数据库(内核) - 清泛网 - 专注C/...

...e用户的SQL执行历史记录?select * from v$sqlarea t order by t LAST_ACTIVE_TIME desc注意 :执行此语句等等一些相关的语句 必须具有DBA 的权限 虽然 select * from v$sqlarea t order by t.LAST_ACTIVE_TIME desc 注意 :执行此语句等等一些相关的语句 必...
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Get Unix Epoch Time in Swift

...alSince1970) let preciseMilliseconds = Int(Date().timeIntervalSince1970 * 1_000) let preciseMicroseconds = Int(Date().timeIntervalSince1970 * 1_000_000) // most likely precise Unfortunately, however, in the year 2038, 32-bit numbers won't be usable for the Unix timestamp and they'll have to be 64-...
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What is the best way to create constants in Objective-C

...s, enum is great and you absolutely should use it. (Even better, use the NS_ENUM and NS_OPTIONS macros.) For other things, you must use something else; enum does not do anything but integers. And other questions I was thinking about importing the file in the Reddit-Prefix.pch file to make the c...
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Why is TypedReference behind the scenes? It's so fast and safe… almost magical!

... Short answer: portability. While __arglist, __makeref, and __refvalue are language extensions and are undocumented in the C# Language Specification, the constructs used to implement them under the hood (vararg calling convention, TypedReference type, arglist...
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How to optimize for-comprehensions and loops in Scala?

...ormance in simple cases: http://groups.google.com/group/scala-user/browse_thread/thread/86adb44d72ef4498 http://groups.google.com/group/scala-language/browse_thread/thread/94740a10205dddd2 Here is the issue in the bug tracker: https://issues.scala-lang.org/browse/SI-4633 Update 5/28: As a sho...
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Why does C++11 not support designated initializer lists as C99? [closed]

...kery, so just sharing for fun. #define with(T, ...)\ ([&]{ T ${}; __VA_ARGS__; return $; }()) And use it like: MyFunction(with(Params, $.Name = "Foo Bar", $.Age = 18 )); which expands to: MyFunction(([&] { Params ${}; $.Name = "Foo Bar", $.Age = 18; return $; }())); ...
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How can I quickly sum all numbers in a file?

...ing as the awk solution in Ayman Hourieh's answer: % perl -nle '$sum += $_ } END { print $sum' If you're curious what Perl one-liners do, you can deparse them: % perl -MO=Deparse -nle '$sum += $_ } END { print $sum' The result is a more verbose version of the program, in a form that no one ...