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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561
15
장
스칼라 타입 시스템 II
class C7
{
val name1
=
P1
.
O1
.
O2
.
name
//
OK
-
필드에
대한
참조
type C1
=
P1
.
O1
.
C1
//
OK
-
‘
말단
’
클래스에
대한
참조
val c1
=
new P1
.
O1
.
C1
//
OK
-
위와
같은
이유
//
val name2
=
P1
.
O1
.
C1
.
name
//
오류
-
P1
.
O1
.
C1
은
안정적이지
않음
}
C7
의 멤버인
name1
,
C1
,
c1
은 경로의 마지막 부분을 제외하고는 모두 안정적인 요소를 사용하
지만,
name2
는 안정적이지 않은 요소 (
C1
)를 끝에서 두 번째 위치에 사용했다.
마지막의
name2
선언의 주석을 제거하면 다음과 같은 컴파일 오류가 나는 것을 보고 이를 알 수
있다.
[
error
]
.../
typepaths
/
path
-
expressions
.
scala
:
52
:
value C1 is not a member of
object progscala2
.
typesystem
.
typepaths
.
P1
.
O1
[
error
]
val name2
=
P1
.
O1
.
C1
.
name
[
error
]
^
물론 코드에서 복잡한 경로를 사용하지 않는 편이 더 좋은 생각이다.
15.2
의존적 메서드 타입
스칼라
2
.
10
에 추가된 기능으로 의존적 메서드 타입
dependent
method
type
이 있다. 이는 ...
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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.