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Why does PHP 5.2+ disallow abstract static class methods?
After enabling strict warnings in PHP 5.2, I saw a load of strict standards warnings from a project that was originally written without strict warnings:
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Should I instantiate instance variables on declaration or in the constructor?
...he compiler.
The first variant is more readable.
You can't have exception handling with the first variant.
There is additionally the initialization block, which is as well put in the constructor(s) by the compiler:
{
a = new A();
}
Check Sun's explanation and advice
From this tutorial:
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What are the differences between a clustered and a non-clustered index?
What are the differences between a clustered and a non-clustered index ?
12 Answers
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AppStore - App status is ready for sale, but not in app store
... guess it messes up with the dates. Looks like sometimes if you do nothing and just follow the instructions, the app will never go live.
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When to use std::begin and std::end instead of container specific versions [duplicate]
...references or rules that explain when container specific versions of begin and end should be used instead of free functions std::begin and std::end ?
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Why does C++11 not support designated initializer lists as C99? [closed]
... constructor. This is the sort of abstraction C++ promotes.
On the other hand the designated initializers feature is more about exposing and making members easy to access directly in client code. This leads to things like having a person of age 18 (years?) but with height and weight of zero.
In ...
What is the MySQL VARCHAR max size?
...ySQL table has a maximum row size limit of 65,535 bytes, not counting BLOB and TEXT types. BLOB and TEXT columns only contribute 9 to 12 bytes toward the row size limit because their contents are stored separately from the rest of the row. Read more about Limits on Table Column Count and Row Size.
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Is there any kind of hash code function in JavaScript?
...d, alternatively, maintain an array which indexes the objects in question, and use its index string as a reference to the object. Something like this:
var ObjectReference = [];
ObjectReference.push(obj);
set['ObjectReference.' + ObjectReference.indexOf(obj)] = true;
Obviously it's a little verbo...
Is there a rule-of-thumb for how to divide a dataset into training and validation sets?
Is there a rule-of-thumb for how to best divide data into training and validation sets? Is an even 50/50 split advisable? Or are there clear advantages of having more training data relative to validation data (or vice versa)? Or is this choice pretty much application dependent?
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JPG vs. JPEG image formats
I often use JPEG images, and I have noticed that there are two very similar file extensions: .jpg , which my mobile's camera and the Preview application use, and .jpeg , with which Image Capture saves the images from scanning with my Canon MX455 printer. LaTeX doesn't seem to distinguish...