堆栈内存溢出
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C ++向量指针数组

[英]C++ vector pointer array

 原文  2010-07-14 01:29:38  0   4    c++

问题描述

具有struct_gene和struct_units 。 我将所有Struck_gene值读取为vector 。 我如何为struck_units.has_gene[i]分配指针以指向struct_gene向量中的某个值，所以我不必写完全值的stickt_gene，然后读取它。

我试了一段时间，但没有找到有效的解决方案

http://a.imageshack.us/img195/8607/001tfa.jpg

编辑-这是Jakobud检索的代码： 

#include <iostream>
#include <fstream>
#include <vector>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
struct struct_gene {
    string name;
    string description;
};

struct struct_unit {
    string name;
    string surname;
    int age;
    int hunger;
    int happines;
    vector<struct_gene> *has_genes[12];
    struct_unit *maried_to;
    struct_unit *father;
    struct_unit *mother;
};

int main () {
    const int default_unit_count = 4;
    fstream gene_list;
    struct_gene * t_struct_gene;
    t_struct_gene = new struct_gene;
    gene_list.open("gene_list", ios::in);
    vector<struct_gene> vector_gene;
    //string name, description;

    gene_list >> t_struct_gene->name;
    getline(gene_list, t_struct_gene->description);
    while (gene_list) {
        vector_gene.push_back(*t_struct_gene);
        gene_list >> t_struct_gene->name;
        getline(gene_list, t_struct_gene->description);
    }
    delete t_struct_gene;

//   for (int i =0; i<vector_gene.size(); i++) {
//      cout <<vector_gene[i].name <<" "<<vector_gene[i].description<<endl;
//   }
    struct_unit *t_struct_unit;
    t_struct_unit = new struct_unit;

    srand ( time(NULL) );

    vector<struct_unit> vector_units;

    for (int i=0; i<default_unit_count; i++) {

        t_struct_unit->name = "unit_name";
        t_struct_unit->surname = "unit_surname";
        t_struct_unit->age = rand()%200;
        t_struct_unit->hunger = rand()%70 +30;
        t_struct_unit->happines = rand()%70 + 30;
        for (int i=0; i<12; i++) {
            t_struct_unit->has_genes[i] = vector_gene[rand()%vector_gene.size()];
        }
        t_struct_unit->maried_to = NULL;
        t_struct_unit->father = NULL;
        t_struct_unit->mother = NULL;
        vector_units.push_back(*t_struct_unit);
    }

    for (int i=0; i<vector_units.size(); i++) {
        cout << vector_units[i].name <<" "<<vector_units[i].surname<<endl;
        cout <<"Age:"<< vector_units[i].age <<" Hunger:"<<vector_units[i].hunger<<" Happines:"<<vector_units[i].happines<<endl;
        for (int j=0; j<0; j++) {
            cout <<vector_units[i].has_genes[j].name;
        }
        cout <<"==="<<endl;
    }
    delete t_struct_unit;
}

4 个解决方案

解决方案1
 1  2010-07-14 01:40:24

t_struct_unit->has_genes[i] = &vector_gene

这会将指向您的基因列表的指针分配到该单元的第i个插槽中。

但是要注意，由于vector_gene不是全局变量，因此它（及其所有内容）将在返回函数后的一段时间内被垃圾填充。 由于它位于main ，对您来说可能不是问题，但是您应该了解堆栈和堆分配之间的区别。

另外，您确定要每个struct_unit都容纳struct_gene向量的整个数组吗？ 您不希望每个人都只拥有12个基因，而不是12个基因载体吗？

解决方案2
 0  2010-07-14 01:38:31

尝试这个;

1）实例struct_unit 

struct_unit aunit;

2）然后在循环内部将基因设置在所需位置（ SOME_INDEX由您定义） 

//inside loop
vector_gene.push_back(*t_struct_gene);
aunit.has_genes[SOME_INDEX] = *t_struct_gene;
//

解决方案3
 0  2010-07-14 01:41:28

http://codepad.org/TZpNS59a ： 

#include <iostream>
#include <fstream>
#include <vector>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
struct struct_gene {
    string name;
    string description;
};

struct struct_unit {
    string name;
    string surname;
    int age;
    int hunger;
    int happines;
    vector<struct_gene> *has_genes[12];
    struct_unit *maried_to;
    struct_unit *father;
    struct_unit *mother;
};

int main () {
    const int default_unit_count = 4;
    fstream gene_list;
    struct_gene * t_struct_gene;
    t_struct_gene = new struct_gene;
    gene_list.open("gene_list", ios::in);
    vector<struct_gene> vector_gene;
    //string name, description;

    gene_list >> t_struct_gene->name;
    getline(gene_list, t_struct_gene->description);
    while (gene_list) {
        vector_gene.push_back(*t_struct_gene);
        gene_list >> t_struct_gene->name;
        getline(gene_list, t_struct_gene->description);
    }
    delete t_struct_gene;

//   for (int i =0; i<vector_gene.size(); i++) {
//      cout <<vector_gene[i].name <<" "<<vector_gene[i].description<<endl;
//   }
    struct_unit *t_struct_unit;
    t_struct_unit = new struct_unit;

    srand ( time(NULL) );

    vector<struct_unit> vector_units;

    for (int i=0; i<default_unit_count; i++) {

        t_struct_unit->name = "unit_name";
        t_struct_unit->surname = "unit_surname";
        t_struct_unit->age = rand()%200;
        t_struct_unit->hunger = rand()%70 +30;
        t_struct_unit->happines = rand()%70 + 30;
        for (int i=0; i<12; i++) {
            t_struct_unit->has_genes[i] = vector_gene[rand()%vector_gene.size()];
        }
        t_struct_unit->maried_to = NULL;
        t_struct_unit->father = NULL;
        t_struct_unit->mother = NULL;
        vector_units.push_back(*t_struct_unit);
    }

    for (int i=0; i<vector_units.size(); i++) {
        cout << vector_units[i].name <<" "<<vector_units[i].surname<<endl;
        cout <<"Age:"<< vector_units[i].age <<" Hunger:"<<vector_units[i].hunger<<" Happines:"<<vector_units[i].happines<<endl;
        for (int j=0; j<0; j++) {
            cout <<vector_units[i].has_genes[j].name;
        }
        cout <<"==="<<endl;
    }
    delete t_struct_unit;
}

解决方案4
 0  2010-07-14 01:53:48

这是他的代码： 

#include <iostream>
#include <fstream>
#include <vector>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
struct struct_gene {
    string name;
    string description;
};

struct struct_unit {
    string name;
    string surname;
    int age;
    int hunger;
    int happines;
    vector<struct_gene> *has_genes[12];
    struct_unit *maried_to;
    struct_unit *father;
    struct_unit *mother;
};

int main () {
    const int default_unit_count = 4;
    fstream gene_list;
    struct_gene * t_struct_gene;
    t_struct_gene = new struct_gene;
    gene_list.open("gene_list", ios::in);
    vector<struct_gene> vector_gene;
    //string name, description;

    gene_list >> t_struct_gene->name;
    getline(gene_list, t_struct_gene->description);
    while (gene_list) {
        vector_gene.push_back(*t_struct_gene);
        gene_list >> t_struct_gene->name;
        getline(gene_list, t_struct_gene->description);
    }
    delete t_struct_gene;

//   for (int i =0; i<vector_gene.size(); i++) {
//      cout <<vector_gene[i].name <<" "<<vector_gene[i].description<<endl;
//   }
    struct_unit *t_struct_unit;
    t_struct_unit = new struct_unit;

    srand ( time(NULL) );

    vector<struct_unit> vector_units;

    for (int i=0; i<default_unit_count; i++) {

        t_struct_unit->name = "unit_name";
        t_struct_unit->surname = "unit_surname";
        t_struct_unit->age = rand()%200;
        t_struct_unit->hunger = rand()%70 +30;
        t_struct_unit->happines = rand()%70 + 30;
        for (int i=0; i<12; i++) {
            t_struct_unit->has_genes[i] = vector_gene[rand()%vector_gene.size()];
        }
        t_struct_unit->maried_to = NULL;
        t_struct_unit->father = NULL;
        t_struct_unit->mother = NULL;
        vector_units.push_back(*t_struct_unit);
    }

    for (int i=0; i<vector_units.size(); i++) {
        cout << vector_units[i].name <<" "<<vector_units[i].surname<<endl;
        cout <<"Age:"<< vector_units[i].age <<" Hunger:"<<vector_units[i].hunger<<" Happines:"<<vector_units[i].happines<<endl;
        for (int j=0; j<0; j++) {
            cout <<vector_units[i].has_genes[j].name;
        }
        cout <<"==="<<endl;
    }
    delete t_struct_unit;
}

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