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What is mattr_accessor in a Rails module?
...ght want to write a class method in a module, such that whenever any class includes the module, it gets that class method as well as all the instance methods. mattr_accessor also lets you do this.
However, in the second scenario, it's behaviour is pretty strange. Observe the following code, particu...
Approximate cost to access various caches and main memory?
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Windbg Step 2 分析程序堆栈实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ep 2 分析程序堆栈实战转载+整理http: www.cnblogs.com killmyday#include"stdafx.h"#include<tchar.h>#ifdef_UNICODE#define_ttol_wtol#else#define_ttolatol#e...转载+整理 http://www.cnblogs.com/killmyday
#include "stdafx.h"
#include <tchar.h>
#ifdef _UNICODE
#define _ttol _wtol
...
How to turn on line numbers in IDLE?
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While this workaround works, why were numbered lines not included in the first release. It seems like an obvious feature. Very disappointing that this isn't included.
– JayRugMan
Dec 28 '17 at 1:29
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The input is not a valid Base-64 string as it contains a non-base 64 character
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This will cause the above error.
Just remove everything in front of and including the first comma, and you good to go.
imageCode = "iVBORw0KGgoAAAANSUhEUgAAAMgAAABkC...
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What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?
...ement as more information gets crammed into each iPhone app. Facebook has included it in their latest version and the new Gmail app appears to include it as well . I was wondering if anybody had thoughts on the most efficient way of developing something like this as it's becoming a more common in...
How to drop rows of Pandas DataFrame whose value in a certain column is NaN
...ted by Wouter in his original comment. The ability to handle missing data, including dropna(), is built into pandas explicitly. Aside from potentially improved performance over doing it manually, these functions also come with a variety of options which may be useful.
In [24]: df = pd.DataFrame(np...
How can I iterate over an enum?
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#include <iostream>
#include <algorithm>
namespace MyEnum
{
enum Type
{
a = 100,
b = 220,
c = -1
};
static const Type All[] = { a, b, c };
}
void fun( const MyEnum::Type e )
{
std::cout <...
Which HTML5 reset CSS do you use and why? [closed]
...S properties except direction and unicode-bidi? That way you don't need to include any additional files:
{
all: unset
}
CSS all has wide support except in IE/Edge. Similarly with unset.
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Get current stack trace in Ruby without raising an exception
... No, technically caller is an instance method. Since Kernel module is included in every Ruby class (except BasicObject in 1.9), it's available as instance method on any object (it's private, though). You can't call it as Kernel.new.caller simply because you can't instantiate a module (it doesn'...