java - Java 到 C++ 的迁移，如何做递归类
问题描述
所以，我正在研究一个超级深入的矮人堡垒模拟类型的东西。最初，我从 java 开始，但我知道该项目最终会发展到性能成为真正问题的地步。于是，我切换到了 C++。但是，java 中调用的类之一Material似乎没有转换为 c++。在 java 版本中，该类看起来像这样：（在此之后我将有一个包含所有重要位的版本）
//import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
public class material {
private int melting_temp=10200;
private int boiling_temp=10500;
private int elastic=10;
private int plastic=10;
private int density=10;
private float pourosity=0; //how much liquid the material can absorb (0 - 1)
private material[] composite= new material[1]; // what this meta-material is built out of.
private char[] RGB= {255,255,255};
public char[] get_RGB() {
return RGB;
}
public void set_RGB(char[] rGB) {
RGB = rGB;
}
public material() {
//composite[0]= new material(false);
}
public material(String file, int index) throws Exception {
String[] z=loader(file);
String b = z[index];
string_load(b.split("PUT_SPACE_HERE"));
}
public material(material new_material) { // useful for copying characteristics
melting_temp=new_material.get_melting_temp();
boiling_temp=new_material.get_boiling_temp();
elastic=new_material.get_elastic();
plastic=new_material.get_plastic();
density=new_material.get_density();
pourosity=new_material.get_pourosity();
composite=new_material.get_composite();
RGB=new_material.get_RGB();
}
public material(int mt, int bt, int el, int pl, int dn, int pr) { // create a new material with parameters
melting_temp=mt;
boiling_temp=bt;
elastic=el;
plastic=pl;
density=dn;
pourosity=pr;
}
public void blend_material(material new_material) { // adds a new material to the composite
//System.out.println(composite[0]);
if(composite[0]==null) {
composite[0]=new material(0,0,0,0,0,0);
}
composite = Arrays.copyOf(composite, composite.length+1);
composite[composite.length-1]=new_material;
melting_temp=0;
boiling_temp=0;
elastic=0;
plastic=0;
density=0;
pourosity=0;
for(int i=0; i<composite.length; i++) { // set the properties of this meta-material to be the average of it's components
melting_temp+=composite[i].get_melting_temp();
boiling_temp+=composite[i].get_boiling_temp();
elastic += composite[i].get_elastic();
plastic += composite[i].get_plastic();
density += composite[i].get_density();
pourosity += composite[i].get_pourosity();
for(int j=0; j<3;j++) {
RGB[j]+=composite[i].get_RGB()[j];
}
}
melting_temp/=composite.length-1;
boiling_temp/=composite.length-1;
elastic/=composite.length-1;
plastic/=composite.length-1;
density/=composite.length-1;
pourosity/=composite.length-1;
for(int j=0; j<3;j++) {
RGB[j]=(char)Math.min(RGB[j]/composite.length,255);
}
}
public material[] get_composite() {
return composite;
}
public void change_melting_temp(int new_temp) {
melting_temp=new_temp;
}
public void change_boiling_temp(int new_temp) {
boiling_temp=new_temp;
}
public int get_melting_temp() {
return melting_temp;
}
public int get_boiling_temp() {
return boiling_temp;
}
public int get_plastic() {
return plastic;
}
public void change_plastic(int new_plastic) {
this.plastic= new_plastic;
}
public int get_elastic() {
return elastic;
}
public void change_elastic(int new_elastic) {
this.elastic= new_elastic;
}
public int get_density() {
return density;
}
public void change_density(int new_density) {
this.density= new_density;
}
public float get_pourosity() {
return pourosity;
}
public void change_pourosity(int new_pourosity) {
this.pourosity = new_pourosity;
}
public void random() {
melting_temp=(int)(Math.random()*2000 +9000);
boiling_temp=melting_temp+(int)(Math.random()*2000);
elastic=(int)(Math.random()*200);
plastic=(int)(Math.random()*200);
density=(int)(Math.random()*200);
pourosity=(float)(Math.random());
}
public void load_from(String name, int index) throws Exception {
String[] z=loader(name);
String b = z[index];
string_load(b.split("PUT_SPACE_HERE"));
}
public String[] loader(String name) throws Exception {
String[] whole_text=new String[0]; // create array to hold the text strings
Path filePath = Paths.get(name); // set path
Charset charset = StandardCharsets.UTF_8; // set the correct characterset
//try {
whole_text = (Files.readAllLines(filePath, charset)).toArray(new String[0]); // actually load the data into a single object
//} catch (IOException ex) { // if that fails, print I/O EXCEPTION
//System.out.format("I/O Exception", ex);
//}
String running_total="";
for(int i=0; i<whole_text.length; i++) {
running_total+=whole_text[i]+"PUT_SPACE_HERE";
}
whole_text=running_total.split("&");
return whole_text;
}
public void string_load(String[] data) throws Exception{// takes in correctly formated tags
for(int i=0; i<data.length;i++) {
data[i]=data[i].replaceAll("\\s", "");
if(data[i].indexOf(':')>=0) {
int z=data[i].indexOf(':');
//System.out.println(data[i].substring(z+1,data[i].length()-1));
switch (data[i].substring(1,z)) {
case "melt_temp": melting_temp=Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" melt");
break;
case "boil_temp": boiling_temp=Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" boil");
break;
case "elastic": elastic=Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" elastic");
break;
case "plastic": plastic=Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" plastic");
break;
case "pourosity": pourosity=Float.parseFloat(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" pourousity");
break;
case "density": density=Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); //System.out.println(" density");
break;
case "composite": if(! data[i].substring(z+1,data[i].length()-1).equals("false")) { //if not false, this is a composite
String[] temp = data[i].substring(z+1,data[i].length()-1).split(",");
int[] composite_list= new int[temp.length];
for(int j=0; j< temp.length; j++) {
composite_list[j]=Integer.parseInt(temp[j]);
}
for(int j=0; j< composite_list.length; j++) {
material temp2=new material();
temp2.load_from("materials.txt",composite_list[j]);
//System.out.println(temp2);
//System.out.println(composite.length);
blend_material(temp2);
}
}
break;
case "R":RGB[0] = (char)Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); break;
case "G":RGB[1] = (char)Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); break;
case "B":RGB[2] = (char)Integer.parseInt(data[i].substring(z+1,data[i].length()-1)); break;
}
}
}
}
}
这些都是重要的部分：
public class material {
private int melting_temp=10200;
private int boiling_temp=10500;
private int elastic=10;
private int plastic=10;
private int density=10;
private float pourosity=0; //how much liquid the material can absorb (0 - 1)
private material[] composite= new material[1]; // what this meta-material is built out of.
private char[] RGB= {255,255,255};
public void blend_material(material new_material) { // adds a new material to the composite
//System.out.println(composite[0]);
if(composite[0]==null) {
composite[0]=new material(0,0,0,0,0,0);
}
composite = Arrays.copyOf(composite, composite.length+1);
composite[composite.length-1]=new_material;
melting_temp=0;
boiling_temp=0;
elastic=0;
plastic=0;
density=0;
pourosity=0;
for(int i=0; i<composite.length; i++) { // set the properties of this meta-material to be the average of it's components
melting_temp+=composite[i].get_melting_temp();
boiling_temp+=composite[i].get_boiling_temp();
elastic += composite[i].get_elastic();
plastic += composite[i].get_plastic();
density += composite[i].get_density();
pourosity += composite[i].get_pourosity();
for(int j=0; j<3;j++) {
RGB[j]+=composite[i].get_RGB()[j];
}
}
melting_temp/=composite.length-1;
boiling_temp/=composite.length-1;
elastic/=composite.length-1;
plastic/=composite.length-1;
density/=composite.length-1;
pourosity/=composite.length-1;
for(int j=0; j<3;j++) {
RGB[j]=(char)Math.min(RGB[j]/composite.length,255);
}
}
}
现在，我只是试图在没有任何方法的情况下翻译基本类定义，但我似乎无法让composite变量工作。我不断收到关于类字段不完整的错误。这是问题代码：
* Material.h
*
* Created on: Aug 6, 2021
* Author: sting
*/
#include <memory>
using namespace std;
class Material {
public:
Material(){
}
Material();
virtual ~Material();
//unsigned int temp;
float dense=0;
unsigned int plastic=0; // the threshold of when the material is permanently deformed.
unsigned int breakage=0; // the threshold of force that breaks the material.
float tConduct=0; // thermal conductivity
float eConduct=0; // electrical conductivity
unsigned int thickness=0; // the viscosity of the fluid at 300 degrees.
// NOTE: apparent viscosity changes as an exponential function. like 2^-x .
// for fluid flow simulations, the flow amount should be thickness^-300-x ticks per tile.
unsigned int apparentThick=0;
unsigned int melt=0; // the temperature at which the material melts
unsigned int boil=0; // the temperature at which the material boils.
struct Composite{
shared_ptr<Material> material(new Material[]);
unsigned char len=0;
//bool init=false; // if this is true, the material is composed out of other materials.
};
Composite composite;
};
这个问题特别shared_ptr<Material> material(new Material[]);在行。我正在尝试建立一个系统，其中可以根据“元素”材料的平均值构建材料。
既然我显然做错了什么，我应该怎么做呢？
解决方案
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