如何在另一个模板结构(C ）中使用模板结构

我是C/C 的新手，并试图模板Point和RectBound的结构允许双重和浮点类型。

这是点定义

// simple Point structure                                                           
template <typename T, typename U, typename V>                                       
struct Point{                                                                       
    T x;                                                                            
    U y;                                                                            
    V z; // optional                                                                
    /*                                                                              
    Point(){                                                                        
       x = T();                                                                     
       y = U();                                                                     
       z = V();                                                                     
    }*/                                                                             
    Point(T _x, U _y) {                                                             
        x = _x;                                                                     
        y = _y;                                                                     
    }                                                                               
    Point(T _x, U _y, V _z){                                                        
        x = _x;                                                                     
        y = _y;                                                                     
        z = _z;                                                                     
    }                                                                               
    inline bool equals(Point & p){                                                  
        return(p.x == x && p.y == y);                                               
    }                                                                               
};   

，这是直流结构

// Rectangular Bounds for tree
// T,U should hold double or float only
template <typename T, typename U, typename V>
struct RectBounds {
    // x, y center point   
    T x;
    U y;
    // dimension width w and height h
    T w, h;
    //constructors
    // (_x, _y): center of rectangle bound. (_w, _h): width and height 
    RectBounds(T _x, U _y, T _w, T _h){
        x = _x;
        y = _y;
        w = _w;
        h = _h;
    }
    // returns true if point p is in Rect bounds, false otherwise
    inline bool contains(Point & p) {
        float _w = w/2.0f;
        float _h = h/2.0f;
        return p.x >= x - _w && p.x < x + _w && p.y >= y - _h && p.y < y + _h;
    }
    // returns true if rectangle o intersects this, false otherwise
    inline bool intersects( RectBounds & o){
        float _w = w/2.0f;
        float _h = h/2.0f;
        return !(o.y + o.h/2.0f <= y - _h || o.y - o.h/2.0f >= y + _h || o.x + o.w/2.0f <= x - _w || o.x - o.w/2.0f >= x + _w);
    } 
};

我得到以下错误的错误：（从逆向倾斜函数中的返回线的错误）

error: request for member ‘x’ in ‘p’, which is of non-class type ‘int’
error: request for member ‘x’ in ‘p’, which is of non-class type ‘int’
error: request for member ‘y’ in ‘p’, which is of non-class type ‘int’
error: request for member ‘y’ in ‘p’, which is of non-class type ‘int’

我试图在RectBounds类中定义一个点，如下所示

Point<T,U,V> cp;，但这无济于事。

有什么建议？