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On design patterns: When should I use the singleton?
...ler. Your application should only have a single instance of the spooler in order to avoid conflicting request for the same resource.
Or a database connection or a file manager etc.
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std::enable_if to conditionally compile a member function
...to another class, then inherit from that class. You may have to change the order of inheritence to get access to all of the other underlying data but this technique does work.
template< class T, bool condition> struct FooImpl;
template<class T> struct FooImpl<T, true> {
T foo() { ...
In which order should floats be added to get the most precise result?
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Your instinct is basically right, sorting in ascending order (of magnitude) usually improves things somewhat. Consider the case where we're adding single-precision (32 bit) floats, and there are 1 billion values equal to 1 / (1 billion), and one value equal to 1. If the 1 comes f...
Create Windows service from executable
...u'll (almost certainly) have to run the command prompt as Administrator in order for this command to work
– Jeutnarg
Aug 29 '16 at 21:10
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What are Scala context and view bounds?
... view bounds in the standard library (before Scala 2.8.0, anyway), is with Ordered, like this:
def f[A <% Ordered[A]](a: A, b: A) = if (a < b) a else b
Because one can convert A into an Ordered[A], and because Ordered[A] defines the method <(other: A): Boolean, I can use the expression a...
How can I get form data with JavaScript/jQuery?
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Please also beware that in order to record a value from any form input, the input must have a name attribute.
– Chris - Jr
Oct 27 '17 at 19:37
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How to check whether an object is a date?
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In order to check if the value is a valid type of the standard JS-date object, you can make use of this predicate:
function isValidDate(date) {
return date && Object.prototype.toString.call(date) === "[object Date]" &...
Failed to install Python Cryptography package with PIP and setup.py
... macOS 10.12 with Python3.7 (in a virtualenv) when needing cryptography in order to install ansible.
– jalanb
Jan 22 '18 at 22:18
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What is lazy loading in Hibernate?
...hen iterating over the collection, this causes a query for every child. In order to avoid this, you can trick hibernate into loading all children simultaneously, e.g. by calling parent.getChildren().size().
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What must I know to use GNU Screen properly? [closed]
...ing to split my terminal. I didn't realize I needed to run screen first in order to get any of these commands to work, silly, I know.
– Ogaday
Nov 3 '15 at 11:49
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