You are watching: Does not provide a subscript operator

13.1

What's the deal with operator overloading? | |

13.2 | What are the benefits of operator overloading? |

13.3 | What room some instances of operator overloading? |

13.4 | Is operator overloading an alleged to do the class' password clearer? |

13.5 | What operator can/cannot it is in overloaded? |

13.6 | Overloading operator== to usage string comparison? |

13.7 | Can I develop operator** because that to-the-power-of? |

13.8 | But which operator should ns override? |

13.9 | Guidelines / "rules of thumb" because that overloading operators? |

13.10 | Creating a subscript operator for a matrix class? |

13.11 | Should mine Matrix interface look choose an array-of-array? |

13.12 | Part two of making mine Matrix interface look favor an array-of-array? |

13.13 | Designing classes from the outside-in vs. Inside-out? |

13.14 | Overloading prefix/postfix develops of operators ++ and also --? |

13.15 | Which is an ext efficient: i++ or ++i? |

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Use operator() quite than operator<>.When you have actually multiple subscripts, the cleanest means to execute it is withoperator() rather than through operator<>. The reason is thatoperator<> constantly takes precisely one parameter, however operator()can take any number of parameters (in the instance of a rectangle-shaped matrix, twoparameters are needed).For example:class procession public: Matrix(unsigned rows, unsigned cols); double& operator() (unsigned row, unsigned col);

*← subscript operators regularly come in pairs*dual operator() (unsigned row, unsigned col) const;

*← subscript operators frequently come in pairs*

*...*~Matrix(); //

*Destructor*Matrix(Matrix const& m); //

*Copy constructor*Matrix& operator= (Matrix const& m); //

*Assignment operator*

*...*private: unsigned rows_, cols_; double* data_;;inlineMatrix::Matrix(unsigned rows, unsigned cols) : rows_ (rows) , cols_ (cols) //

*data_ = rows_ || col >= cols_) litter BadIndex("Matrix subscript out of bounds"); return data_*;}inlinedouble Matrix::operator() (unsigned row, unsigned col) constThen you can accessibility an element of matrix m making use of m(i,j)rather 보다 m

:int main(){ matrix m(10,10); m(5,8) = 106.15; std::cout view the following FAQ for much more detail top top thereasons to use m(i,j) vs. M

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