Import Declarations
An
import declaration can be placed in a header file or the header of a class file. It uses the following syntax:import dyvil.collection.mutable.ArrayList
This makes the type
ArrayList in the dyvil.collection.mutable package available in the current scope. Furthermore, it is also possible to import multiple types at once, as shown below:import dyvil.collection.immutable.{ ArraySet, EmptyList }
This allows you to import both the
ArraySet and EmptyList types without having to re-type the package. To import all types in a given package, you can use the special _ symbol, called a Wildcard Import this this context:import dyvil.collection.range._ // imports all types in the 'dyvil.collection.range' package
Import Declarations can not only be used to import classes. By placing one ore more of the following keywords after
import, you can opt in for different member kinds.Keyword | Member Kind |
package | Packages |
header | Headers |
type | Type Aliases and Type Members |
class | Classes, Interfaces and Traits |
func | Static Methods |
var or const | Static Fields |
static | Static Fields or Methods |
implicit | Implicit Static Methods |
inline (implies header) | All header declarations from the header |
Without any keyword, all member kinds will be imported. The
using keyword is equivalent to import static inline , i.e. it imports static methods and header declarations.// Package Imports
import package dyvil.collection.mutable
let list: mutable.ArrayList = new mutable.ArrayList()
// Type Imports
import type dyvil.lang.Lang.Configure
func f(c: Configure<String>) = c("abc")
// Function Imports
import func java.lang.String.valueOf
let s: valueOf(10)
// Field Imports
import const java.lang.Integer.MAX_VALUE
let i = MAX_VALUE
// Implicit Imports
import implicit dyvil.lang.Strings.s2Name
let n: Name = "abc"
// Inline Imports
import inline dyvil.lang.Lang // this import declaration is implicitly present in every Dyvil file
Last modified 4yr ago