Friends: Syntax

class matrix; // Note: this is a forward declaration

class vector {

float v[4];

// …

friend vector multiply(const matrix &, const vector &);

};

class matrix {

vector v[4];

// …

friend vector multiply(const matrix &; const vector &);

};

vector multiply(matrix &m, const vector &v)

{

// code to do vector multiplication that can take advantage

// of the knowledge of the internal representation

}

Previous slide

Next slide

Back to first slide

View graphic version