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TypeError: 'NoneType' object is not iterable in Python
... Correct, But the common scenario author intended here is totally to skip the for loop instead of raising an exception. Python's design is flawed here. When None is treated as an iterable it must return empty list at least. This exception never helped anyone in real life other than m...
How to see which flags -march=native will activate?
I'm compiling my C++ app using GCC 4.3. Instead of manually selecting the optimization flags I'm using -march=native , which in theory should add all optimization flags applicable to the hardware I'm compiling on. But how can I check which flags is it actually using?
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What is JSON and why would I use it?
...the official documentation, but I still haven't got to the point where I really understand what JSON is, and why I'd use it.
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汇编常用寄存器及指令基础总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...定了四个段寄存器，专门用来保存段地址：
CS（Code Segment）：代码段寄存器
DS（Data Segment）：数据段寄存器
SS（Stack Segment）：堆栈段寄存器
ES（Extra Segment）：附加段寄存器
特殊功能的寄存器：
IP（Intruction Pointer）：指令...
ANTLR: Is there a simple example?
...r, and evaluator using ANTLR4.
You first create a grammar. Below is a small grammar that you can use to evaluate expressions that are built using the 4 basic math operators: +, -, * and /. You can also group expressions using parenthesis.
Note that this grammar is just a very basic one: it does ...
On delete cascade with doctrine2
...ple in order to learn how to delete a row from a parent table and automatically delete the matching rows in the child table using Doctrine2.
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Why should I declare a virtual destructor for an abstract class in C++?
...structor when deleting a pointer to a base class.
– j_random_hacker
Feb 10 '09 at 10:10
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curl : (1) Protocol https not supported or disabled in libcurl
...\" )
– Appu Mistri
May 25 '19 at 17:32
1
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Force CloudFront distribution/file update
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Good news. Amazon finally added an Invalidation Feature. See the API Reference.
This is a sample request from the API Reference:
POST /2010-08-01/distribution/[distribution ID]/invalidation HTTP/1.0
Host: cloudfront.amazonaws.com
Authorization:...
How do pointer to pointers work in C?
... 60.
As to why one uses pointers to pointers:
The name of an array usually yields the address of its first element. So if the array contains elements of type t, a reference to the array has type t *. Now consider an array of arrays of type t: naturally a reference to this 2D array will have typ...