July 2016
Beginner to intermediate
776 pages
17h 26m
Korean
Content preview from 프로그래밍 스칼라: 실용적인 스칼라 활용법을 익히는 가장 확실한 실전 바이블 (2.11.x 버전 기반)
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649
19
장
스칼라 동적 호출
19.2
Dynamic
트레이트를 사용해서 스칼라에서 동적 호출하기
비슷한
DSL
을 스칼라에서 구현할 수 있다면 좋을 것이다. 하지만 일반적으로 스칼라에서는 모
든 메서드를 명시적으로 정의해야 한다. 다행히 스칼라
2
.
9
에 추가된
scala
.
Dynamic
(
http
://
bit
.
ly
/
1pbhB8b
) 트레이트를 사용하면 우리가 방금 묘사했던 동적인 호출이 가능하다.
Dynamic
트레이트는 표시를 위한 트레이트다. 그 안에는 메서드 정의가 없다. 대신 컴파일러가
이 트레이트를 보면 미리 약속된 처리 절차를 따른다. 트레이트의 스칼라독 페이지(
http
://
bit
.
ly
/
1pbhB8b
)를 보면 그 절차가
Dynamic
을 확장한
Foo
클래스로 만든
foo
라는 인스턴스에 대
한 다음 예제를 사용해서 정리되어 있다.
foo
.
method
("
blah
")
~~
>
foo
.
applyDynamic
("
method
")("
blah
")
foo
.
method
(
x
=
"
blah
")
~~
>
foo
.
applyDynamicNamed
("
method
")(("
x
",
"
blah
"))
foo
.
method
(
x
=
1
,
2
)
~~
>
foo
.
applyDynamicNamed
("
method
")(("
x
",
1
),
("",
2
))
foo
.
field
~~
>
foo
.
selectDynamic
("
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.