c++ - 重载赋值运算符不适用于链接 C++

Question

main.cpp :

Simple2DMatrix &Simple2DMatrix::assign (const Simple2DMatrix &matrixB) {

if ((numRows == matrixB.numRows)
    && (numCols == matrixB.numCols)
    )
{

    for (int r = 0; r < numRows; r++)
    {
        for (int c = 0; c < numCols; c++)
        {
            this->setElement(r, c, matrixB.getElement(r, c));
        }
    }
    return (*this);
}
else

{
    throw "Dimensions does not match!";
}

并添加为:

  if ((this->numRows == matrixB.numRows)
    && (this->numCols == matrixB.numCols)
    )
{

    for (int r = 0; r < this->numRows; r++)
    {
        for (int c = 0; c < this->numCols; c++)
        {
            this->setElement(r, c, this->getElement(r, c) + matrixB.getElement(r, c));
        }
    }
    return (*this);
}
else

{
    throw " Dimensions does not match!";
}

因此，分配将是: {

if ((numRows == matrixB.numRows)
    && (numCols == matrixB.numCols)
    )
{

    for (int r = 0; r < numRows; r++)
    {
        for (int c = 0; c < numCols; c++)
        {
            this->setElement(r, c, matrixB.getElement(r, c));
        }
    }
    return (*this);
}
else

{
    throw "Dimensions does not match!";
}

并在 operator+ 的标题中:

    Simple2DMatrix<T> matrixTemp(matrixA.numRows, matrixA.numCols);

    matrixTemp.sum(matrixA, matrixB);
    return (matrixTemp);

对于 operator= :

this->assign(matrixB);
return(*this);

非常感谢您的所有消息。

Answer 1

这是你的(运算符+)代码:

if ((this->numRows == matrixB.numRows)
    && (this->numCols == matrixB.numCols)
    )
{

    for (int r = 0; r < matrixA.numRows; r++)
    {
        for (int c = 0; c < matrixA.numCols; c++)
        {
            this->setElement(r, c, matrixA.getElement(r, c) + matrixB.getElement(r, c));
        } //what is matrixA?
    }
    return (*this); //what you want to return?? it seems you are doing B=B+C
}
else

{
    throw " Dimensions does not match!";
}

实际上你需要先为你的类创建一个临时对象并存储添加的 B和C在里面。 然后返回该临时变量。