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file_put_contents(meta/services.json): failed to open stream: Permission denied

... I had never heard of this. "Security-Enhanced Linux (SELinux) is a Linux kernel security module that provides a mechanism for supporting access control security policies." I doubt it's a good idea to turn it off. And I bet the upvoters are blindly using this com...
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How can I sharpen an image in OpenCV?

... edge and high frequency. For sharpening an image these transitions can be enhanced further. One way is to convolve a self made filter kernel with the image. import cv2 import numpy as np image = cv2.imread('images/input.jpg') kernel = np.array([[-1,-1,-1], ...
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What is external linkage and internal linkage?

... Info that might greatly enhance this answer: 1) static is not deprecated anymore in C++11. 2) anonymous namespace members in C++11 have internal linkage by default. See stackoverflow.com/questions/10832940/… – Klaim ...
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Differences between .NET 4.0 and .NET 4.5 in High level in .NET

.... After the release of the .NET Framework 4, Microsoft released a set of enhancements, named Windows Server AppFabric, for application server capabilities in the form of AppFabric Hosting and in-memory distributed caching support. .NET Framework 4.5 .NET Framework 4.5 was released on 15 Augu...
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Difference between private, public, and protected inheritance

...dow { public: int getWidth() const; }; protected member Providing enhanced access for derived classes class stack { protected: vector<element> c; }; class window { protected: void registerClass(window_descriptor w); }; private member Keep implementation details class windo...
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What new capabilities do user-defined literals add to C++?

...on of the language, and thus added it. In C, if you need the same notation enhancement for another type, you're out of luck until your lobbying to add your quantum wave functions (or 3D points, or whatever basic type you're using in your field of work) to the C standard as a built-in type succeeds. ...
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How to create an HTML button that acts like a link?

... clear. Obviously the JS makes mine different but it is just a progressive enhancement. The form still goes to that link without the JS. I was curious about the intended behavior of just the HTML <form>s in each of our examples. Is formaction on a button supposed to add the ? to an empty GET s...
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Test if a variable is set in bash when using “set -o nounset”

...a #!/bin/bash at the top of your script, it is actually best to use bash's enhancements. – Bruno Bronosky Jan 25 '17 at 14:49 add a comment  |  ...
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HAproxy - Web负载均衡解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...站) https://www.haproxy.org/download/1.8/src/haproxy-1.8.14.tar.gz (下载地址) http://cbonte.github.io/haproxy-dconv/1.8/configuration.html (文档Haproxy 1.8 文档) HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理,支持虚拟主机,它是免费、...
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CSS hexadecimal RGBA?

... I found the answer after posting the enhancement to the question. Sorry! MS Excel helped! simply add the Hex prefix to the hex colour value to add an alpha that has the equivalent opacity as the % value. (in rbga the percentage opacity is expressed as a decim...