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Invert “if” statement to reduce nesting
...iredAmount();
return normalPayAmount();
};
I've picked this code from the refactoring catalog. This specific refactoring is called: Replace Nested Conditional with Guard Clauses.
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How can I scan barcodes on iOS?
...ation for the iPhone. It can decode QR Codes. The source code is available from the zxing project; specifically, you want to take a look at the iPhone client and the partial C++ port of the core library. The port is a little old, from circa the 0.9 release of the Java code, but should still work rea...
How to override trait function and call it from the overridden function?
...n calc($v) {
return parent::calc($v*3);
}
}
// .... other code from above
print (new MyTraitChildClass())->calc(2); // will print 8 (2*3 + 2)
You can also provide for ways to override, but still access the trait method as follows:
trait A {
function trait_calc($v) {
ret...
read file from assets
I am using this code trying to read a file from assets. I tried two ways to do this. First, when use File I received FileNotFoundException , when using AssetManager getAssets() method isn't recognized.
Is there any solution here?
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Returning multiple values from a C++ function
Is there a preferred way to return multiple values from a C++ function? For example, imagine a function that divides two integers and returns both the quotient and the remainder. One way I commonly see is to use reference parameters:
...
Formula to determine brightness of RGB color
...olor was used. Each color is represented by 2x2 pixels, colors are sorted from darkest to lightest (left to right, top to bottom).
1st picture - Luminance (relative)
0.2126 * R + 0.7152 * G + 0.0722 * B
2nd picture - http://www.w3.org/TR/AERT#color-contrast
0.299 * R + 0.587 * G + 0.114 * B
...
Will GetType() return the most derived type when called from the base class?
Will GetType() return the most derived type when called from the base class?
3 Answers
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New features in java 7
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Java SE 7 Features and Enhancements from JDK 7 Release Notes
This is the Java 7 new features summary from the OpenJDK 7 features page:
vm JSR 292: Support for dynamically-typed languages (InvokeDynamic)
Strict class-file checking
lang JSR 334: S...
Please explain some of Paul Graham's points on Lisp
I need some help understanding some of the points from Paul Graham’s What Made Lisp Different .
4 Answers
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How to remove a field completely from a MongoDB document?
Suppose this is a document. How do I remove " words " completely from all the documents in this collection? I want all documents to be without " words ":
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