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How do I define a method which takes a lambda as a parameter in Java 8?
...bda does not need to know that a Lambda is involved, instead it accepts an Interface with the appropriate method.
In other words, you define or use a functional interface (i.e. an interface with a single method) that accepts and returns exactly what you want.
For this Java 8 comes with a set of co...
How to initialize a vector in C++ [duplicate]
...l flags to be enabled on your compiler) you can simply do:
std::vector<int> v { 34,23 };
// or
// std::vector<int> v = { 34,23 };
Or even:
std::vector<int> v(2);
v = { 34,23 };
On compilers that don't support this feature (initializer lists) yet you can emulate this with an a...
PHP String to Float
...1,5h tracking down an issue caused by different locales causing (float) to convert on the first server to "," and on the second to ","
– Dr. Gianluigi Zane Zanettini
Jan 22 '16 at 15:36
...
Quick Way to Implement Dictionary in C
...om scratch. I don't want it to be generic either -- something like string->int will do. But I do want it to be able to store an arbitrary number of items.
...
“inconsistent use of tabs and spaces in indentation”
...s and spaces in indentation error and select:
view > indentation > convert indentation to spaces
which resolved the issue for me.
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When should you use constexpr capability in C++11?
...
Suppose it does something a little more complicated.
constexpr int MeaningOfLife ( int a, int b ) { return a * b; }
const int meaningOfLife = MeaningOfLife( 6, 7 );
Now you have something that can be evaluated down to a constant while maintaining good readability and allowing slightly ...
What are C++ functors and their uses?
...which "look like" a function:
// this is a functor
struct add_x {
add_x(int val) : x(val) {} // Constructor
int operator()(int y) const { return x + y; }
private:
int x;
};
// Now you can use it like this:
add_x add42(42); // create an instance of the functor class
int i = add42(8); // and...
What's the point of const pointers?
I'm not talking about pointers to const values, but const pointers themselves.
17 Answers
...
private final static attribute vs private final attribute
...new Test();
x.instanceVariable = 10;
y.instanceVariable = 20;
System.out.println(x.instanceVariable);
prints out 10: y.instanceVariable and x.instanceVariable are separate, because x and y refer to different objects.
You can refer to static members via references, although it's a bad idea to do s...
What is an “unwrapped value” in Swift?
...pe basically means that the variable can be nil.
Example:
var canBeNil : Int? = 4
canBeNil = nil
The question mark indicates the fact that canBeNil can be nil.
This would not work:
var cantBeNil : Int = 4
cantBeNil = nil // can't do this
To get the value from your variable if it is optional,...