Vector与数组的转化

可以重载*运算符

 operator float *(){ return &_x ;} ;
2 operator const float *() const{ return &_x ; } ;
3 

仿照D3D库中的例子，写出如下代码

 #include <iostream>
 using namespace std ;
 
 struct Vector
 {
     Vector(float x, float y, float z):_x(x), _y(y), _z(z){}
     Vector(float *p):_x(p[0]), _y(p[1]), _z(p[2]){}
 
     operator float *(){ return &_x ;} ;
     //operator const float *() const{ return &_x ; } ;
 
     float _x ;
     float _y ;
     float _z ;
 } ;
 
 void OutputVector(Vector &v)
 {
     cout << v._x << ", " << v._y << ", " << v._z << endl ;
 }
 
 void OutputArray(float *p)
 {
     cout << p[0] << ", " << p[1] << ", " << p[2] << endl ;
 }
 
 int main(void)
 {
     // array -> vector
     float p[] = { 1, 2, 3} ;
     Vector v(p) ;
     OutputVector(v) ;
 
     // vector -> array
     Vector v1(2, 3, 4) ;
     float *p1 = v1 ;
     OutputArray(p1) ;
 
     system("pause") ;
     return 0 ;
 }

==