Question

我有一个模板矢量类，可以在其中更改坐标的类型我已经将声明和定义分别放在.h和.cpp文件中。这是代码：

Vector.h：

#pragma once
#include <iostream>

template <class T>
struct Vec3 {
    union {
        struct {
            T r, g, b;
        };
        struct {
            T x, y, z;
        };
        T data[3];
    };

    Vec3()
        : x(0), y(0), z(0)
    {};

    Vec3(int a, int b, int c)
        : x(a), y(b), z(c)
    {};

    Vec3<T>& operator+=(const Vec3<T>& o);
    Vec3<T>& operator-=(const Vec3<T>& o);
    Vec3<T>& operator*=(const Vec3<T>& o);
    Vec3<T>& operator/=(const Vec3<T>& o);

    Vec3<T> operator+(const Vec3<T>& o) const;
    Vec3<T> operator-(const Vec3<T>& o) const;
    Vec3<T> operator*(const Vec3<T>& o) const;
    Vec3<T> operator/(const Vec3<T>& o) const;

    T dot(const Vec3<T>& o) const;
    T length() const;
    T lengthSQ() const;
    Vec3<T> normalize();
};

template <class T>
std::ostream & operator << (std::ostream &in, Vec3<T>&v)
{
    std::cout << "Vec3<"
        << typeid(T).name()
        << "> {" << v.x << ", " << v.y << ", " << v.z << "};";
    return in;
}

using Vec3f = Vec3<float>;
using Vec3i = Vec3<int>;

Vector.cpp：

#pragma once

#include "Vector.h"
#include <cmath>

template <class T>
Vec3<T>& Vec3<T>::operator+=(const Vec3<T>& o) {
    this->x += o.x;
    this->y += o.y;
    this->z += o.z;
};

template <class T>
Vec3<T>& Vec3<T>::operator-=(const Vec3<T>& o) {
    this->x -= o.x;
    this->y -= o.y;
    this->z -= o.z;
};

template <class T>
Vec3<T>& Vec3<T>::operator*=(const Vec3<T>& o) {
    this->x *= o.x;
    this->y *= o.y;
    this->z *= o.z;
};

template <class T>
Vec3<T>& Vec3<T>::operator/=(const Vec3<T>& o) {
    this->x /= o.x;
    this->y /= o.y;
    this->z /= o.z;
};


template <class T>
Vec3<T> Vec3<T>::operator+(const Vec3<T>& o) const {
    return Vec3<T>(
        this->x + o.x,
        this->y + o.y,
        this->z + o.z
        );
};

template <class T>
Vec3<T> Vec3<T>::operator-(const Vec3<T>& o) const {
    return Vec3<T>(
        this->x - o.x,
        this->y - o.y,
        this->z - o.z
        );
};

template <class T>
Vec3<T> Vec3<T>::operator*(const Vec3<T>& o) const {
    return Vec3<T>(
        this->x * o.x,
        this->y * o.y,
        this->z * o.z
        );
};

template <class T>
Vec3<T> Vec3<T>::operator/(const Vec3<T>& o) const {
    return Vec3<T>(
        this->x / o.x,
        this->y / o.y,
        this->z / o.z
        );
};

template<class T>
T Vec3<T>::dot(const Vec3<T>& o) const {
    return this->x * o.x + this->y * o.y + this->z * o.z;
};

template <class T>
T Vec3<T>::lengthSQ() const {
     return this->x*this->x + this->y*this->y + this->z*this->z;
};

template<class T>
T Vec3<T>::length() const {
    return std::sqrtf(this->lengthSQ());
};

template <class T>
Vec3<T> Vec3<T>::normalize() {
    return (*this)*(1 / this->length());
};

以下是错误：

LNK2019 : unresolved external symbol "public:struct Vec3<float> _thiscall Vec3<float>::operator+(struct Vec3<float> const&)const" (object symbol...) referenced in function "some function" (some different symbol...)

LNK2019 : unresolved external symbol "public:struct Vec3<float> _thiscall Vec3<float>::operator-(struct Vec3<float> const&)const" (object symbol...) referenced in function "some function" (some different symbol...)

(...)

LNK1120 : 4 unresolved externals

注意：我跳过了引用外部的符号和函数，因为它们并不重要

我正在使用Visual Studio 2017，我的计算机最近在打开项目时因电池电量不足而关闭了，这是造成问题的原因吗？

我现在真的迷失了，我有了定义，所以我不明白为什么编译器会生我的气...

在此先感谢您的帮助：）

C ++外部无法解析，但存在定义

0 个答案: