C++结构体指针与函数返回值结合

#include <iostream>

struct Point {
    int x;
    int y;
};

// 函数返回指向新创建的 Point 结构体的指针
Point* createPoint(int x, int y) {
    Point* p = new Point; // 在堆上分配内存
    p->x = x;
    p->y = y;
    return p;
}

int main() {
    Point* myPoint = createPoint(10, 20);
    std::cout << "x: " << myPoint->x << ", y: " << myPoint->y << std::endl;

    delete myPoint; // 释放内存，避免内存泄漏
    myPoint = nullptr; // 将指针置空，防止悬挂指针

    return 0;
}

std::unique_ptr

std::shared_ptr

#include <iostream>
#include <memory> // 引入智能指针

struct Point {
    int x;
    int y;
};

// 使用 std::unique_ptr 返回指向新创建的 Point 结构体的指针
std::unique_ptr<Point> createPoint(int x, int y) {
    std::unique_ptr<Point> p(new Point); // 使用 unique_ptr 管理内存
    p->x = x;
    p->y = y;
    return p;
}

int main() {
    std::unique_ptr<Point> myPoint = createPoint(10, 20);
    std::cout << "x: " << myPoint->x << ", y: " << myPoint->y << std::endl;

    // unique_ptr 会在超出作用域时自动释放内存，无需手动 delete

    return 0;
}

struct Color {
    float r;
    float g;
    float b;
};

Color

Color getDefaultColor() {
    Color defaultColor = {1.0f, 1.0f, 1.0f}; // 白色
    return defaultColor;
}

struct Mesh {
    std::vector<float> vertices;
    std::vector<unsigned int> indices;
    // ... 其他数据
};

Mesh

Mesh

#include <memory>

std::unique_ptr<Mesh> createMesh() {
    std::unique_ptr<Mesh> mesh = std::make_unique<Mesh>();
    // 初始化网格数据
    return mesh;
}