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How do I print a double value with full precision using cout?
...g base 2 representation and base 2 can't represent something as trivial as 1.1 exactly. The only way to get the full-full precision of the actual double (with NO ROUND OFF ERROR) is to print out the binary bits (or hex nybbles).
One way of doing that is using a union to type-pun the double to a int...
How do I associate a Vagrant project directory with an existing VirtualBox VM?
...
WARNING: The solution below works for Vagrant 1.0.x but not Vagrant 1.1+.
Vagrant uses the ".vagrant" file in the same directory as your "Vagrantfile" to track the UUID of your VM. This file will not exist if a VM does not exist. The format of the file is JSON. It looks like this if a single...
Positioning MKMapView to show multiple annotations at once
....latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1;
region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1;
region = [mapView regionThatFits:region];
[mapView setRegion:region animated:YES];
}
...
Why does AuthorizeAttribute redirect to the login page for authentication and authorization failures
...2014) to remove the ambiguity.
From "Hyper Text Transport Protocol (HTTP/1.1): Authentication" (RFC 7235):
The 401 (Unauthorized) status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource.
From "Hypertext Transfer Pr...
Elegant way to invert a map in Scala
...ap(g -> Array(2, 5), h -> Array(2), y -> Array(5))
Map('q' -> 1.1F, 'b' -> 2.1F, 'c' -> 1.1F, 'g' -> 3F).invert
//res1: Map(1.1 -> Set(q, c), 2.1 -> Set(b), 3.0 -> Set(g))
Map(9 -> "this", 8 -> "that", 3 -> "thus", 2 -> "thus").invert
//res2: Map(this ->...
C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...考工具书。
目录
第1章 你好，C++的并发世界… 1
1.1 什么是并发… 1
1.1.1 计算机系统的并发… 1
1.1.2 并发的方法… 3
1.2 为什么使用并发… 4
1.2.1 因划分重点而使用并发… 5
1.2.2 为了提高性能而使用并发… 5
1.2.3 什么...
Optimal settings for exporting SVGs for the web from Illustrator?
...SVG profiles
SVG 1.0: all modern desktop and mobile browsers support SVG 1.1, so never choose this option.
SVG 1.1: You will almost always want this.
SVG Tiny/Basic: this is a subset of SVG intended for mobile devices. Only a handful of devices support SVG Tiny and not the full spec, so go for SVG...
How to linebreak an svg text within javascript?
...
This is not something that SVG 1.1 supports. SVG 1.2 does have the textArea element, with automatic word wrapping, but it's not implemented in all browsers. SVG 2 does not plan on implementing textArea, but it does have auto-wrapped text.
However, given t...
How to prevent favicon.ico requests?
...id an IFRAME will generate 3 requests for favicons:
"GET /favicon.ico HTTP/1.1" 404 183
"GET /apple-touch-icon-precomposed.png HTTP/1.1" 404 197
"GET /apple-touch-icon.png HTTP/1.1" 404 189
The following uses data URI and can be used to avoid fake favicon requests:
<link rel="shortcut icon" href...
Force browser to clear cache
... For example:
script_1.0.css // This is the URL for release 1.0
script_1.1.css // This is the URL for release 1.1
script_1.2.css // etc.
Or alternatively do it after the file name:
script.css?v=1.0 // This is the URL for release 1.0
script.css?v=1.1 // This is the URL for release 1.1
script.c...