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Is #pragma once part of the C++11 standard?
Traditionally, the standard and portable way to avoid multiple header inclusions in C++ was/is to use the #ifndef - #define - #endif pre-compiler directives scheme also called macro-guard scheme (see code snippet below).
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How do I create a random alpha-numeric string in C++?
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C++11 allows you to separate the generator from the engine, but what is best depends on what the needs of your application are. This is why my first snippet uses rand and the second does not.
– Carl
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CSS: Control space between bullet and
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+1 for actually answering the guy's question ;) (though the span should ideally in real life have a class anyway for good practice futureproofing as well as semantics: if in future any javascript or new features development etc had a go...
Any way to declare a size/partial border to a box?
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Not really. But it's very easy to achieve the effect in a way that degrades gracefully and requires no superfluous markup:
div {
width: 350px;
height: 100px;
background: lightgray;
position: relative;
margin: 20...
Meaning of Android Studio error: Not annotated parameter overrides @NonNull parameter
...(And also)
import android.support.annotation.NonNull;
The purpose is to allow the compiler to warn when certain assumptions are being violated (such as a parameter of a method that should always have a value, as in this particular case, although there are others). From the Support Annotations doc...
How can I safely create a nested directory?
...r versions of Python, I see two answers with good qualities, each with a small flaw, so I will give my take on it:
Try os.path.exists, and consider os.makedirs for the creation.
import os
if not os.path.exists(directory):
os.makedirs(directory)
As noted in comments and elsewhere, there's a r...
A non-blocking read on a subprocess.PIPE in Python
...hat everything does and don't copy it blindly, even if it just works! (Actually the simplest solution is to use a thread and do a readline as Seb did, Qeues are just an easy way to get the data, there are others, threads are the answer!)
– Aki
Feb 22 '12 at 13:...
Why isn't textarea an input[type=“textarea”]?
...erent type (e.g. “textarea") than single-line fields ("text"), as they really are different types of things, and imply different issues (semantics) for client-side handling.
– Marc Andreessen, 11 October 1993
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How to add global ASP.Net Web Api Filters?
...or MVC and the other is for Web API. They are two separate things and normally you wouldn't want filters for one being applied to the other.
– Shane Courtrille
Aug 29 '12 at 15:26
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How do I interpret precision and scale of a number in a database?
...number of decimal places
ie 123456.789 has a scale of 3
Thus the maximum allowed value for decimal(5,2) is 999.99
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