这是我的构造函数:
Matrix::Matrix(int rows, int columns)
{
elements = new int*[rows];
for (int x = 0; x < rows; x++)
{
elements[x] = new int[columns];
}
}
这是我的析构函数:
Matrix::~Matrix()
{
delete elements;
}
我已将析构函数更改为说“删除 [] 元素”、“删除 * 元素”、“删除元素*”以及各种组合,并且每种组合都会卡住程序。我也试过“删除这个”,但这也卡住了程序。我会尝试“free()”,但我听说这是一种糟糕的编程习惯,它实际上并没有释放内存。
感谢任何帮助。
最佳答案
使用 valgrind --leak-check=yes
,我没有泄漏
编辑:添加了一个复制构造函数以允许 Matrix myMat2 = myMat;
样式调用。
此时您可能应该正在寻找 swap
样式的函数和复制赋值运算符。等等等等……
#include <iostream>
class Matrix
{
int** elements;
int rows_;
public:
Matrix(int, int);
~Matrix();
Matrix(const Matrix&);
};
Matrix::Matrix(int rows, int columns)
{
std::cout<< "Matrix constructor called" << std::endl;
rows_ = rows;
elements = new int*[rows];
for (int x=0; x<rows; x++)
{
elements[x] = new int[columns];
}
}
Matrix::~Matrix()
{
for (int x=0; x<rows_; x++)
{
delete[] elements[x];
}
delete[] elements;
std::cout<< "Matrix destructor finished" << std::endl;
}
Matrix::Matrix(const Matrix &rhs)
{
std::cout<< "Called copy-constructor" << std::endl;
rows_ = rhs.rows_;
columns_ = rhs.columns_;
elements = new int*[rows_];
for (int x=0; x<rows_; x++)
{
elements[x] = new int[columns_];
*(elements[x]) = *(rhs.elements[x]);
}
}
int main()
{
Matrix myMat(5, 3);
Matrix myMat2 = myMat;
return 0;
}
Valgrind 输出:
user:~/C++Examples$ valgrind --leak-check=yes ./DestructorTest
==9268== Memcheck, a memory error detector
==9268== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==9268== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
==9268== Command: ./DestructorTest
==9268==
Matrix constructor called
Called copy-constructor
Matrix destructor finished
Matrix destructor finished
==9268==
==9268== HEAP SUMMARY:
==9268== in use at exit: 0 bytes in 0 blocks
==9268== total heap usage: 12 allocs, 12 frees, 200 bytes allocated
==9268==
==9268== All heap blocks were freed -- no leaks are possible
==9268==
==9268== For counts of detected and suppressed errors, rerun with: -v
==9268== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
关于c++ - 当你有一个二维数组(在 C++ 中)时,调用析构函数的正确方法是什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25517847/