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Scala: Abstract types vs generics
... def back(x:B):A
}
The compiler will object with bunch of variance check errors
In that case you may gather all type requirements in additional trait and parametrize other traits over it
//one trait to rule them all
trait OO[O <: OO[O]] { this : O =>
type A <: AA[O]
type B <: BB[...
Node.js spawn child process and get terminal output live
...pt let childProcess = exec ( './script-to-run --arg1 arg1value', ( error, stdout, stderror ) => { console.log( '[CALLBACK]: ' + error ); // or stdout or stderror } ); // Same as with spawn: childProcess.stdout.on ( 'data', ( data ) => { console.log(...
预编译头文件来自编译器的早期版本，或者预编译头为 C++ 而在 C 中使用它(...
...切换为“所有配置”。
在“配置属性”---“连接器”---“常规”的“附件库目录”填上库所在的目录名，这个目录名最好是在工程文件夹中建一个专门放lib的文件夹。
C++ 编译器 版本
预编译头文件来自编译器的早期版本，或者预编译头为 C++ 而在 C 中使用它(...
...sp; 在“配置属性”---“连接器”---“常规”的“附件库目录”填上库所在的目录名，这个目录名最好是在工程文件夹中建一个专门放lib的文件夹。
How to get maximum value from the Collection (for example ArrayList)?
...|
edited Nov 28 '17 at 13:05
nanosoft
1,97422 gold badges2929 silver badges4747 bronze badges
answered N...
Difference between sh and bash
...to),
#!/bin/bash
will use /bin/bash if it's available (and fail with an error message if it's not). Of course, you can also specify another implementation, e.g.
#!/bin/dash
Which one to use
For my own scripts, I prefer sh for the following reasons:
it is standardized
it is much simpler and ...
get just the integer from wc in bash
...
What if I'm piping with with find? I get an error: find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l works ok but prints every file. If I use find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l < I get an error. parse error near '\n'
...
How to delete items from a dictionary while iterating over it?
...
EDIT:
This answer will not work for Python3 and will give a RuntimeError.
RuntimeError: dictionary changed size during iteration.
This happens because mydict.keys() returns an iterator not a list.
As pointed out in comments simply convert mydict.keys() to a list by list(mydict.keys()) ...
Longest line in a file
...vinderSingh13
63.9k88 gold badges3030 silver badges5050 bronze badges
answered Oct 31 '09 at 20:13
Pale Blue DotPale Blue Dot
5,43...
Are lists thread-safe?
...s but keep the numbers big enough and run a few times and you will see the error
The FLAWED version
import threading
import time
# Change this number as you please, bigger numbers will get the error quickly
count = 1000
l = []
def add():
for i in range(count):
l.append(i)
tim...