不匹配调用函数 C++

No match for call to function C++

我正在尝试编写 raytracer,但由于以下错误而无法编译我的程序:

src\util\Ray.cpp: In constructor 'Ray::Ray()': src\util\Ray.cpp:8:17: error: no match for call to '(Vector3D) (double, double, double)'
o(0.0, 0.0, 0.0); ^ makefile.mak:31: recipe for target 'Ray.o' failed mingw32-make: *** [Ray.o] Error 1

这是代码:

//Vector3D.h
#ifndef __VECTOR3D__
#define __VECTOR3D__

class Vector3D{
    public: 

        float x;
        float y;
        float z;

    public: 

        Vector3D(void);
        Vector3D(const float&, const float&, const float&);
        Vector3D(const Vector3D& obj);
};

#endif



//Vector3D.cpp
#include <iostream>

#include "Vector3D.h"

using namespace std;

Vector3D::Vector3D(void){
    x       = 0.0;
    y       = 0.0;
    z       = 0.0;
}

Vector3D::Vector3D(const float &p_x, const float &p_y, const float &p_z){
    x       = p_x;
    y       = p_y;
    z       = p_z;
}

Vector3D::Vector3D(const Vector3D& obj){
    x       = obj.x;
    y       = obj.y;
    z       = obj.z;
}



//Ray.h
#ifndef __RAY__
#define __RAY__

#include "Vector3D.h"

class Ray{
    public:

        Vector3D o;
        Vector3D d;

    public: 

        Ray(void);
};

#endif



//Ray.cpp
#include "Ray.h"

Ray::Ray(void){
    o(0.0, 0.0, 0.0);
}

我不知道这里出了什么问题,有人可以解释一下吗?

当您到达构造函数的主体时,所有成员都已初始化。这意味着在您的 Ray 构造函数中:

Ray::Ray(void){
    o(0.0, 0.0, 0.0);
}

o(0.0, 0.0, 0.0); 等同于 o.operator()(0.0, 0.0, 0.0).

要为成员调用非默认构造函数,您需要使用初始化列表:

Ray::Ray() : o(0.0, 0.0, 0.0) {
    // note the body of the constructor is now empty
}