RAII file descriptor wrapper using unique_ptr

gistfile1.txt

#include <iostream>
#include <array>
#include <memory>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

struct FdHandle {
    FdHandle() = default;

    /* implicit */ FdHandle(std::nullptr_t) { }

    explicit FdHandle(int fd) : fd(fd) {}

    explicit operator bool() const { return fd != -1; }

    friend bool operator==(FdHandle l, FdHandle r) { return l.fd == r.fd; }

    friend bool operator!=(FdHandle l, FdHandle r) { return !(l == r); }

    int fd{-1};
};

class Fd {
  public:
    Fd() = default;

    Fd(int fd) {
        fd_ = decltype(fd_)(FdHandle(fd), Deleter());
    }

    int getFd() {
        return fd_.get().fd;
    }

  private:
    struct Deleter {
        using pointer = FdHandle;

        void operator()(FdHandle fd) {
            ::close(fd.fd);
        }
    };

    std::unique_ptr<void, Deleter> fd_;
};

int main() {
    Fd f(::open("foo", 0));
    ::write(f.getFd(), "bar", 3);
}