我正在尝试使用标准库向量为Matrix创建一个类。我在向量中使用一个向量来设置矩阵,一个向量代表列,另一个向量代表行,行中存储值。这是变量和构造函数。

变量:

 int columns;
 int rows;
 std::vector<std::vector<int> > v;


构造函数:

 Matrix(int a, int b){
std::cout << "Input Recieved.. Construct Began" << std::endl;
rows = a;
columns = b;
// Subtract one to put them in a proper array format
rows = rows - 1;
columns = columns - 1;
//Creates the columns
v.reserve(columns);
//Creates the Rows .. Code is ran for every column, this is where the values are set
for(int i = 0; i <= columns; i++){

  v[i].reserve(rows);
  std::cout << "Column " << i  + 1 << " Created, with " << rows + 1<< " Rows" << std::endl;


  //Sets the values of the rows .. is ran for every column
  for(int e = 0; e <= rows; e++){
    if(i == 19){
      std::cout << "Column 20 row setting has begun" << std::endl;
    }


    v[i][e] = 2;

    if(i == 19){
    std::cout << "Made it past the line" << std::endl;
  }

    std::cout << "Row " << e + 1 << " Set in Column " << i + 1<< ", with Value " << v[i][e] << std::endl;

    if(i == 19){
      std::cout << "Column 20 row setting has finished" << std::endl;
    }
  }



}

}


现在,它似乎能够创建除最后一个向量以外的所有内容,然后我得到了Segmentation Fault。对于更完整的源代码,有此http://pastebin.com/AB59bPMR

最佳答案

只需使用方法resize()使矩阵所需的大小

matrix.resize(rows, vector < int >(columns));

关于c++ - vector 嵌套的分段故障核心嵌套在 vector 中,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/37708952/

10-11 23:20
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