Question

我认为显而易见的解决方案是在任何地方调用.clone.copy，但有些应用程序在没有.copy的情况下调用.clone可能会有危险或难以调试。

似乎demonstrate clone clone（或被覆盖的copy）似乎未被class Process { def replicate: Process = { println("Hello from Process.replicate") new Process() } } final case class Processes( process1: Process, process2: Process ) { override def clone: Processes = Processes( process1.replicate, process2.replicate) } val origProcesses = Processes(new Process, new Process) val clonedProcesses = origProcesses.copy(process1 = new Process)使用：

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "header.h"


Body nouveauCorps(Body body, Vector3 force, double deltaT){
    double m = body.mass;
    double t = deltaT;

    //Newton's second law:
    double ax = force.x/m;
    double ay = force.y/m;
    double az = force.z/m;

    body.speedx += ax*t;
    body.speedy += ay*t;
    body.speedz += az*t;

    body.x +=t*body.speedx;
    body.y +=t*body.speedy;
    body.z +=t*body.speedz;

    return body;
}

int main()
{
    //Initial conditions:
    double posX = 1.4568899;
    double posY = 5.6584225;
    double posZ = -8.8944444;
    double speedX = 0.232323;
    double speedY = -1.6565656;
    double speedZ = -8.6565656;
    double mass = 558.74;

    //Force applied:
    Vector3 force = {5.8745554, -97887.568, 543.5875};

    Body body = {posX, posY, posZ, speedX, speedY, speedZ, mass};

    double duration = 10.0;
    double pointsPS = 100.0; //Points Per Second
    double pointsTot = duration * pointsPS;

    char name[20];
    sprintf(name, "BN_%fs-%fpts.txt", duration, pointsPS);

    remove(name);
    FILE* fichier = NULL;
    fichier = fopen(name, "w");

    for(int i=1; i<=pointsTot; i++){
        body = nouveauCorps(body, force, duration/pointsTot);
        double t = i/pointsPS;

        //Make a table: TIME | POS_X, Y, Z by simulation | POS_X, Y, Z by modele (reference)
        fprintf(fichier, "%e \t %e \t %e \t %e \t %e \t %e \t %e\n", t, body.x, body.y, body.z, force.x*(t*t)/2.0/mass + speedX*t + posX, force.y*(t*t)/2.0/mass + speedY*t + posY, force.z*(t*t)/2.0/mass + speedZ*t + posZ);
    }
    return 0;
}

Answer 1

您可以提供自己的复制方法：

final case class Processes(
  process1: Process,
  process2: Process
) {
  override def clone: Processes = Processes(
    process1.replicate, process2.replicate)
  def copy(process1: Process = this.process1.replicate, process2: Process = this.process2.replicate): Processes = Processes(
    process1, process2)
}

在这种情况下，您不会获得Scala提供的“免费”copy方法，但您仍然可以避免实施自己的equals，hashCode和随播广告对象{{ 1}}，apply等。

如何让案例类的“副本”使用被覆盖的“克隆”？

1 个答案: