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Difference between static memory allocation and dynamic memory allocation
... a function are only there until the function finishes.
void func() {
int i; /* `i` only exists during `func` */
}
Dynamic memory allocation is a bit different. You now control the exact size and the lifetime of these memory locations. If you don't free it, you'll run into memory leaks, which...
How to compare objects by multiple fields
...stName)
.thenComparing(p->p.lastName)
.thenComparingInt(p->p.age);
If you have accessor methods:
Comparator.comparing(Person::getFirstName)
.thenComparing(Person::getLastName)
.thenComparingInt(Person::getAge);
If a class implements Comparable then ...
Declaring variables inside a switch statement [duplicate]
...d this limitation. You can enclose the contents of a case in { } braces to introduce a scoping block, or you can move the variable declaration outside the switch. Which you choose is a matter of personal preference. Just be aware that a variable declared in { } braces is only valid within that scope...
When to use static vs instantiated classes
...n it's just a tool that works on other stuff (like, for instance, a syntax converter for BB code to HTML ; it doesn't have a life on its own)
(Yeah, I admit, really really overly-simplified...)
One thing about static methods/classes is that they don't facilitate unit testing (at least in PHP, but...
Haversine Formula in Python (Bearing and Distance between two GPS points)
... two points
on the earth (specified in decimal degrees)
"""
# convert decimal degrees to radians
lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
# haversine formula
dlon = lon2 - lon1
dlat = lat2 - lat1
a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) ...
UIButton custom font vertical alignment
...ls
FontTools include a TTX tool which enables conversion to and from XML.
Convert your font to .ttx in the same folder
ttx myFontFile.otf
Make the necessary edits to .ttx and delete the .otf file as this will be replaced in the next step.
Convert the file back to .otf
ttx myFontFile.ttx
Motiv...
Gridview with two columns and auto resized images
...
Here's a relatively easy method to do this. Throw a GridView into your layout, setting the stretch mode to stretch the column widths, set the spacing to 0 (or whatever you want), and set the number of columns to 2:
res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<...
Is it expensive to use try-catch blocks even if an exception is never thrown?
...eptions are thrown asynchronously, they are not async but thrown in safe points. and this part try has some minor costs associated with it. Java cannot do some optimizations on code in a try block that it would otherwise do does need a serious reference. At some point the code is very likely to be w...
How to clone an InputStream?
...same information more than once, and the input data is small enough to fit into memory, you can copy the data from your InputStream to a ByteArrayOutputStream.
Then you can obtain the associated array of bytes and open as many "cloned" ByteArrayInputStreams as you like.
ByteArrayOutputStream baos ...
Using generic std::function objects with member functions in one class
For one class I want to store some function pointers to member functions of the same class in one map storing std::function objects. But I fail right at the beginning with this code:
...