//An example by using template for evaluating the vector operaroins #include //template class template< class T > //vector class class D3Vector { //template class template< class U > //friend functiinality for evaluation of vectir class friend std::ostream & operator<<( std::ostream & , const D3Vector & ) ; //public defined class members public : D3Vector( T a , T b , T c ) { x = a ; y = b ; z = c ; } //dot product if vectors T dotproduct ( const D3Vector & rhs ) { T scalar = x * rhs.x + y * rhs.y + z * rhs.z ; return scalar ; } //cross product of tge vector D3Vector crossproduct ( const D3Vector & rhs ) { T a = y * rhs.z - z * rhs.y ; T b = z * rhs.x - x * rhs.z ; T c = x * rhs.y - y * rhs.x ; D3Vector product( a , b , c ) ; return product ; } D3Vector triplevec( D3Vector & a , D3Vector & b ) { return crossproduct ( a.crossproduct( b ) ) ; } T triplescal( D3Vector & a, D3Vector & b ) { return dotproduct( a.crossproduct( b ) ) ; } private : T x , y , z ; } ; // for defining vector template< class T > std::ostream & operator<< ( std::ostream & os , const D3Vector & vec ) { os << "( " << vec.x << " , " << vec.y << " , " << vec.z << " )" ; return os ; } //main functiin for evaluating above functiin calling int main( ) { D3Vector a( 3 , 4 , 5 ) , b ( 4 , 3 , 5 ) , c( -5 , -12 , -13 ) ; std::cout << "a . b : " << a.dotproduct( b ) << "\n" ; std::cout << "a x b : " << a.crossproduct( b ) << "\n" ; std::cout << "a . b x c : " << a.triplescal( b , c ) << "\n" ; std::cout << "a x b x c : " << a.triplevec( b , c ) << "\n" ; return 0 ; }

vector content