C++将类序列化和反序列化到共享内存

这里用模板泛化一下

template<typename T>
int saveToShm(const T& obj) {
    key_t key = gen_shm_key();
    int shmId = shmget(key, sizeof(T), IPC_CREAT | 0666);
    if (shmId == -1) {
        perror("shmget");
        return -1;
    }
    T* ptr = static_cast<T*>(shmat(shmId, nullptr, 0));
    if (ptr == reinterpret_cast<T*>(-1)) {
        perror("shmat");
        return -1;
    }
    memcpy(ptr, &obj, sizeof(T));
    shmdt(ptr);
    return 0;
}

template<typename T>
T loadFromShm() {
    key_t key = gen_shm_key();
    int shmId = shmget(key, sizeof(T), 0666);
    if (shmId == -1) {
        perror("shmget");
        exit(1);
    }
    T* ptr = static_cast<T*>(shmat(shmId, nullptr, 0));
    if (ptr == reinterpret_cast<T*>(-1)) {
        perror("shmat");
        exit(1);
    }
    T obj;
    memcpy(&obj, ptr, sizeof(T));
    shmdt(ptr);
    return obj;
}