implicit

Implicit def with VarArgs

由 ぃ、小莉子 提交于 2019-12-02 11:19:36
问题 I just noticed that implicit def doesn't seem to work in var args. For example, I have a java function that takes java.lang.Byte... as its parameter input. The function call is surround by a scala method that takes scala.Byte . implicit def convertTest(bytes: Byte*): Seq[java.lang.Byte] = bytes.map(b => b : java.lang.Byte) def test(data: Byte*): Unit ={ test2(convertTest(data: _*): _*) } def test2(data: java.lang.Byte*) = { } For some reason I have to explicitly type convertTest() for this to

How to find Y for corresponding X values (Implicit function, Complex number)

由 ∥☆過路亽．° 提交于 2019-12-02 07:50:45
Given is the equation: Y^2 = X^3 + 2*X - 3*X*Y Assuming the plotted sketch is correct. Y^2 = X^3 + 2*X - 3*X*Y Hint: Y^2 + X^2 =1 ==> Y= sqrt( 1 - X^2 ) The X values are known. How can I find the corresponding Y values for X values? E.g. for known X-Values, I expect something like below listed Y-Values (see the plotted sketch): X= 1 ; Y=0.79 X=2 ; Y=1.58 X=3 ; Y=2.79 X=4 ; Y=4.39 X=5 ; Y=6.33 X=6 ; Y=8.57 X=7 ; Y=11.12 X=8 ; Y=13.92 X=9 ; Y=16.98 X=10 ; Y= 20.29 E.g. I will try to find Y for X=6; then Y will be calculated as follws: Y^2+X^2=1 ==> Y=sqrt(1 - X^2) = sqrt(1-36) = sqrt(-35) = (0,

Ionic Error v.context.$implicit is undefined

由 て烟熏妆下的殇ゞ 提交于 2019-12-02 04:58:15
问题 I have the error in my code. The error says like this: v.context.$implicit is undefined The problem is, sometimes it error, and sometimes it doesn’t… Can somebody explain why it happen… This my html code: <ng-container *ngFor="let time of item.timeInfo | keys" > <ion-row *ngIf="time == thisDay"> <ion-col col-3 no-padding> <ng-container *ngIf="checkTime(); else closeButton"> <button small ion-button block color="secondary" outline> OPEN </button> </ng-container> <ng-template #closeButton>

Algorithm which adapt (solve) the complex equations ( implicit function f(x,y) )

由 …衆ロ難τιáo~ 提交于 2019-12-02 04:54:01
问题 I'm trying to adapt some equations (implicit f(x,y)) in order to be able list the Y for corresponding X-Value. The equations could be e.g. as follows: y^2 = x^3 + 2x - 3xy (X^2+y^2-1)^3-x^2y^3=0 X^3+y^3=3xy^2-x-1 X^3+y^2=6xy/sqrt(y/x) cos(PI*Y) = cos(PI.X) Below you can see the plotted equations: Hint, I don't know, but maybe this can be helpful, the following applies: Y^2 + X^2 =1 ==> Y= sqrt(1-X^2) The equations are to be adapt (substitution), so that they are expressed by X (not Y). For y

Ionic Error v.context.$implicit is undefined

由 孤者浪人 提交于 2019-12-02 01:15:51
I have the error in my code. The error says like this: v.context.$implicit is undefined The problem is, sometimes it error, and sometimes it doesn’t… Can somebody explain why it happen… This my html code: <ng-container *ngFor="let time of item.timeInfo | keys" > <ion-row *ngIf="time == thisDay"> <ion-col col-3 no-padding> <ng-container *ngIf="checkTime(); else closeButton"> <button small ion-button block color="secondary" outline> OPEN </button> </ng-container> <ng-template #closeButton> <button small ion-button block color="danger" outline>Close </button> </ng-template> </ion-col> <ion-col

Why is this implicit ambiguity behaviour happening?

由 纵饮孤独 提交于 2019-12-01 23:41:24
I have a typeclass Search , which has an instance Search[A] if we have a TypeClass1[A] or a TypeClass2[A] instance. With preference given to the 1 instance. The following compiles: trait TypeClass1[A] trait TypeClass2[A] trait Search[A] object Search extends LPSearch { implicit def case1[A](implicit ev: TypeClass1[A]): Search[A] = null } trait LPSearch { implicit def case2[A](implicit ev: TypeClass2[A]): Search[A] = null } object Test { implicit val ev1: TypeClass1[Int] = null implicit val ev2: TypeClass2[Int] = null implicitly[Search[Int]] } This is as I would expect, the implicit search

leaving out some implicit parameters

由 吃可爱长大的小学妹 提交于 2019-12-01 23:18:55
问题 Is it possible to leave out some implicit parameters but not all of them? I tried with named parameters: def foo(implicit a: Int, b: String) { if (a > 0) { println(b) foo(a = a-1) // error } } Unfortunately, the compiler rejects the recursive call of foo with: not enough arguments for method foo Unspecified value parameter b 回答1: It is not possible to leave out some implicit parameters. So, in your example def foo(implicit a: Int, b: String): Unit = ??? It is not possible to only specify a .

Implicit parameter for literal function

由 纵然是瞬间 提交于 2019-12-01 19:38:25
While reading Play! Framework documentation, I came across this snippet: def index = Action { implicit request => session.get("connected").map { user => Ok("Hello " + user) }.getOrElse { Unauthorized("Oops, you are not connected") } } Documentation explains implicit there: Alternatively you can retrieve the Session implicitly from a request Besides, I read this post: Literal with Implicit and it seems logically that function cannot have implicit parameter. If I well figured out, this is because a function , contrary to method has always a contract (interface). Indeed, for instance, Function1

How can i implicitly convert my class to another type?

由 你离开我真会死。 提交于 2019-12-01 19:35:37
For example implicitly MyClass myClass = new MyClass(); int i = myClass; You need to define this in the MyClass file. public static implicit operator int(MyClass instance) { if (instance == null) { return -1; } return instance._underlyingValue; } class MyClass { public static implicit operator int(MyClass myClass) { // code to convert from MyClass to int } } Take a look there : implicit This MSDN entry covers what you want exactly, should do the trick. 来源： https://stackoverflow.com/questions/3016504/how-can-i-implicitly-convert-my-class-to-another-type

How can i implicitly convert my class to another type?

由 半城伤御伤魂 提交于 2019-12-01 18:53:45
问题 For example implicitly MyClass myClass = new MyClass(); int i = myClass; 回答1: You need to define this in the MyClass file. public static implicit operator int(MyClass instance) { if (instance == null) { return -1; } return instance._underlyingValue; } 回答2: class MyClass { public static implicit operator int(MyClass myClass) { // code to convert from MyClass to int } } Take a look there : implicit 回答3: This MSDN entry covers what you want exactly, should do the trick. 来源： https://stackoverflow
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