设计实现一个模拟文件系统。包括文件目录管理、存储空间管理、文件创建、删除、读、写等基本操作功能。求c++语言代码

以下是一个简单的模拟文件系统的 C++ 代码示例，实现了文件目录管理、存储空间管理、文件创建、删除、读、写等基本操作功能。

#include <iostream>
#include <vector>
#include <string>
#include <map>

// 模拟文件系统中的文件
class File {
public:
    File(std::string name, int size) : name_(name), size_(size) {}
    std::string name() const { return name_; }
    int size() const { return size_; }
private:
    std::string name_;
    int size_;
};

// 模拟文件系统中的目录
class Directory {
public:
    Directory(std::string name) : name_(name) {}
    std::string name() const { return name_; }
    void add_file(File file) {
        files_.push_back(file);
        size_ += file.size();
    }
    void remove_file(std::string name) {
        for (int i = 0; i < files_.size(); i++) {
            if (files_[i].name() == name) {
                size_ -= files_[i].size();
                files_.erase(files_.begin() + i);
                break;
            }
        }
    }
    int size() const { return size_; }
    const std::vector<File>& files() const { return files_; }
private:
    std::string name_;
    std::vector<File> files_;
    int size_ = 0;
};

// 模拟文件系统
class FileSystem {
public:
    bool create_file(std::string path, std::string name, int size) {
        std::vector<std::string> dirs = split_path(path);
        Directory* dir = get_directory(dirs);
        if (dir == nullptr) return false;
        for (const File& file : dir->files()) {
            if (file.name() == name) return false;
        }
        dir->add_file(File(name, size));
        return true;
    }
    bool delete_file(std::string path, std::string name) {
        std::vector<std::string> dirs = split_path(path);
        Directory* dir = get_directory(dirs);
        if (dir == nullptr) return false;
        dir->remove_file(name);
        return true;
    }
    bool write_file(std::string path, std::string name, std::string data) {
        std::vector<std::string> dirs = split_path(path);
        Directory* dir = get_directory(dirs);
        if (dir == nullptr) return false;
        for (File& file : dir->files()) {
            if (file.name() == name) {
                file = File(name, data.length());
                storage_[name] = data;
                return true;
            }
        }
        return false;
    }
    std::string read_file(std::string path, std::string name) const {
        std::vector<std::string> dirs = split_path(path);
        Directory* dir = get_directory(dirs);
        if (dir == nullptr) return "";
        for (const File& file : dir->files()) {
            if (file.name() == name) {
                std::string data = storage_.at(name);
                return data;
            }
        }
        return "";
    }
private:
    std::map<std::string, std::string> storage_; // 存储文件内容
    std::vector<Directory> root_; // 根目录
    std::vector<std::string> split_path(std::string path) const {
        std::vector<std::string> dirs;
        std::string dir;
        for (char c : path) {
            if (c == '/') {
                if (!dir.empty()) dirs.push_back(dir);
                dir.clear();
            } else {
                dir += c;
            }
        }
        if (!dir.empty()) dirs.push_back(dir);
        return dirs;
    }
    Directory* get_directory(std::vector<std::string> dirs) {
        std::vector<Directory>* cur = &root_;
        for (int i = 0; i < dirs.size(); i++) {
            bool found = false;
            for (Directory& dir : *cur) {
                if (dir.name() == dirs[i]) {
                    cur = &(dir.files_);
                    found = true;
                    break;
                }
            }
            if (!found) return nullptr;
        }
        return &(*cur)[0];
    }
};

int main() {
    FileSystem fs;
    fs.create_file("/", "file1", 10);
    fs.create_file("/", "file2", 20);
    fs.create_file("/dir1", "file3", 30);
    fs.write_file("/", "file1", "Hello, world!");
    std::cout << fs.read_file("/", "file1") << std::endl;
    fs.delete_file("/dir1", "file3");
    return 0;
}

在上面的代码中，`FileSystem` 类实现了创建、删除、读、写文件等基本操作，`Directory` 类实现了目录的管理，`File` 类实现了文件的基本信息。在存储文件内容时，我们使用了一个 `std::map<std::string, std::string>` 来存储文件名和文件内容的映射关系。