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How do different retention policies affect my annotations?
...ionPolicy.RUNTIME)
@interface RetentionRuntime {}
public static void main(String[] args) {
@RetentionSource
class B {}
assert B.class.getAnnotations().length == 0;
@RetentionClass
class C {}
assert C.class.getAnnotations().length == 0;
@RetentionRuntime
class D {}
...
How to properly check if std::function is empty in C++11?
...
Your result strings are swapped.
– Sophit
Nov 21 '19 at 21:19
...
What is the difference between a static and a non-static initialization code block
...nside Static Initializer.");
// fruits array
ArrayList<String> fruits = new ArrayList<>();
fruits.add("Apple");
fruits.add("Orange");
fruits.add("Pear");
// print fruits
for (String fruit : fruits) {
System.out.println...
Java: is there a map function?
...le:
// example, converts a collection of integers to their
// hexadecimal string representations
final Collection<Integer> input = Arrays.asList(10, 20, 30, 40, 50);
final Collection<String> output =
Collections2.transform(input, new Function<Integer, String>(){
@Over...
Add new column with foreign key constraint in one command
...d by commas. For example...
Informix syntax:
ALTER TABLE one
ADD two_id INTEGER,
ADD CONSTRAINT FOREIGN KEY(two_id) REFERENCES two(id);
The syntax for IBM DB2 LUW is similar, repeating the keyword ADD but (if I read the diagram correctly) not requiring a comma to separate the added items...
Sample settings.xml for maven
... specified at two levels:
|
| 1. User Level. This settings.xml file provides configuration for a single
| user, and is normally provided in
| ${user.home}/.m2/settings.xml.
|
| NOTE: This location can be overridden with the CLI option:
|
| ...
Postgres: How to do Composite keys?
...already implied), too:
CREATE TABLE tags
(
question_id INTEGER NOT NULL,
tag_id SERIAL NOT NULL,
tag1 VARCHAR(20),
tag2 VARCHAR(20),
tag3 VARCHAR(20),
PRIMARY KEY(question_id, tag_id)
);
NOTICE: ...
Passport.js - Error: failed to serialize user into session
...
It looks like you didn't implement passport.serializeUser and passport.deserializeUser. Try adding this:
passport.serializeUser(function(user, done) {
done(null, user);
});
passport.deserializeUser(function(user, done) {
done(null, user);...
Difference between passing array and array pointer into function in C
...is the operand of the sizeof operator or the unary & operator, or is a
string literal used to initialize an array, an expression that has type ‘‘array of type’’ is
converted to an expression with type ‘‘pointer to type’’ that points to the initial element of
the array object and ...
How do I check if a number evaluates to infinity?
... required me to check if the value is of the NaN or Infinity type but pass strings as valid results. Because many text strings will produce false-positive NaN, I've made a simple solution to circumvent that:
const testInput = input => input + "" === "NaN" || input + "" === "Infinity";
The a...