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What's the best way to do a backwards loop in C/C#/C++?
... std::vector
Using iterators
C++ allows you to do this using std::reverse_iterator:
for(std::vector<T>::reverse_iterator it = v.rbegin(); it != v.rend(); ++it) {
/* std::cout << *it; ... */
}
Using indices
The unsigned integral type returned by std::vector<T>::size is not...
Random / noise functions for GLSL
As the GPU driver vendors don't usually bother to implement noiseX in GLSL, I'm looking for a "graphics randomization swiss army knife" utility function set, preferably optimised to use within GPU shaders. I prefer GLSL, but code any language will do for me, I'm ok with translating it on my own ...
How can I get the count of milliseconds since midnight for the current?
... // Get current moment in UTC, then…
.get( ChronoField.MILLI_OF_SECOND ) // interrogate a `TemporalField`.
2017-04-25T03:01:14.113Z → 113
Get the fractional second in nanoseconds (billions).
Divide by a thousand to truncate to milliseconds (thousands).
See this code run l...
Is there a difference between single and double quotes in Java?
...swered Apr 13 '17 at 13:21
Horse_1995Horse_1995
19722 silver badges1212 bronze badges
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How do I join two lists in Java?
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Gawd, that's a thing in Java 8? Technically you win I guess, but that's a heck of a long line :-)
– Robert Atkins
Sep 9 '13 at 20:03
4
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How to properly create composite primary keys - MYSQL
...is a gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as the ID. info is a table that contains information about both table_1 and table_2 .
...
Test if object implements interface
...ckListener,
OnCheckedChangeListener {
public static final String FIRST_RUN_ABOUT = "com.gosylvester.bestrides.firstrunabout";
public interface AboutDialogListener {
void onFinishEditDialog(Boolean _Checked);
}
private AboutDialogListener adl;
@Override
public View onCreateView(LayoutInf...
C read file line by line
...
Why should I do that? Read the manual, buffer is reallocated at each call, then it should be freed at the end.
– mbaitoff
Nov 30 '12 at 12:43
30
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Difference between object and class in Scala
...ompanion object of class C; note that the companion object is not automatically an instance of C.
Also see Scala documentation for object and class.
object as host of static members
Most often, you need an object to hold methods and values/variables that shall be available without having to firs...
How to find Unused Amazon EC2 Security groups
...AWS CLI tool, I found an easy way to get what I need:
First, get a list of all security groups
aws ec2 describe-security-groups --query 'SecurityGroups[*].GroupId' --output text | tr '\t' '\n'
Then get all security groups tied to an instance, then piped to sort then uniq:
aws ec2 describe-instance...