大约有 44,000 项符合查询结果（耗时：0.0815秒） [XML]
Python Create unix timestamp five minutes in the future
...etime.timedelta) didn't mention that shortcut. It only had days, seconds, and microseconds.
– Daniel Rhoden
May 5 '10 at 19:05
12
...
Using Java 8's Optional with Stream::flatMap
The new Java 8 stream framework and friends make for some very concise java code, but I have come across a seemingly-simple situation that is tricky to do concisely.
...
push_back vs emplace_back
I'm a bit confused regarding the difference between push_back and emplace_back .
7 Answers
...
Declaring an unsigned int in Java
...on is that most operations (such as addition, subtraction, multiplication, and left shift) are identical on a binary level for signed and unsigned integers. A few operations (division, right shift, comparison, and casting), however, are different. As of Java SE 8, new methods in the Integer class al...
const vs constexpr on variables
... = 3.141592653589793;
constexpr double PI2 = 3.141592653589793;
Both PI1 and PI2 are constant, meaning you can not modify them. However only PI2 is a compile-time constant. It shall be initialized at compile time. PI1 may be initialized at compile time or run time. Furthermore, only PI2 can be...
How to find the mime type of a file in python?
...stance in BLOBs. Let's say you want to dish these files out via a web page and have the client automatically open the correct application/viewer.
...
Bash Script: count unique lines in file
I have a large file (millions of lines) containing IP addresses and ports from a several hour network capture, one ip/port per line. Lines are of this format:
...
Why do we need private subnet in VPC?
...ed, or the Managed NAT Gateway service can be provisioned, instead. An expanded version of this answer integrating more information about NAT Gateway and how it compares to a NAT instance will be forthcoming, as these are both relevant to the private/public subnet paradigm in VPC.
Note that the In...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...
This is a recurring subject in Stackoverflow and since I was unable to find a relevant implementation I decided to accept the challenge.
I made some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet of paper ...
How to replace case-insensitive literal substrings in Java
...
Not as elegant perhaps as other approaches but it's pretty solid and easy to follow, esp. for people newer to Java. One thing that gets me about the String class is this: It's been around for a very long time and while it supports a global replace with regexp and a global replace with Str...