C++ 使用std：：在流上移动

在尝试一些互斥锁打印功能时，我得到了如下想法：

class MyWriteStream
{
public:
    MyWriteStream(std::ostream &stream) : stream_(std::move(stream)) {}

    void write(const char *str, const size_t size)
    {
        std::lock_guard<std::mutex> lock(mutex_);
        stream_.write(str, size);
    }

    friend MyWriteStream & operator << (MyWriteStream &out, const char *c);

private:
    std::ostream &&stream_;
    std::mutex mutex_;
};

MyWriteStream & operator << (MyWriteStream &out, const char *c)
{
    out.write(c, strlen(c) * sizeof(char));
    return out;
}

MyWriteStream stream(std::cout);
auto blah = [&stream](const char *s) {
    stream << s << "\n";
};
std::vector<std::thread> threads;
for (auto i = 0; i<10; ++i) {
    std::string str = "blah : " + std::to_string(i);
    threads.push_back(std::thread(blah, str.c_str()));
}
for (auto &thread : threads) {
    thread.join();
}

std::cout << "hello" << std::endl;  // Still Works

类MyWriteStream
{
公众：
MyWriteStream（std:：ostream&stream）：流(std:：move（stream））{}
无效写入（常量字符*str，常量大小\u t大小）
{
std：：锁\保护锁（互斥锁）；
流写入（str，size）；
}
friend MyWriteStream&operator
std:：move
不移动。请参阅。我跟踪到了资源管理问题。问题是调用方。指针str.c_str（）在创建线程之前很久就被销毁了。假设本地的堆栈空间相同，这是命中或未命中的。我将其更改为RAII std:：string，它似乎可以工作！