Initial commitHEADmain

1 files changed, 48 insertions, 0 deletions

diff --git a/src/unique_fd.hh b/src/unique_fd.hh
new file mode 100644
index 0000000..dc60b3f
--- /dev/null
+++ b/src/unique_fd.hh
@@ -0,0 +1,48 @@
+#ifndef UNIQUE_FD_HH
+#define UNIQUE_FD_HH
+
+#include <cstddef>
+
+class unique_fd {
+public:
+  constexpr unique_fd() noexcept
+    : fd_(-1) {}
+  constexpr unique_fd(std::nullptr_t) noexcept
+    : fd_(-1) {}
+  explicit unique_fd(int fd) noexcept
+    : fd_(fd) {}
+  unique_fd(unique_fd&& fd) noexcept
+    : fd_(fd.release()) {}
+
+  ~unique_fd() { reset(); }
+
+  unique_fd& operator=(unique_fd&& fd) noexcept {
+    reset(fd.release());
+    return *this;
+  }
+  unique_fd& operator=(std::nullptr_t) noexcept {
+    reset();
+    return *this;
+  }
+
+  int get() const noexcept { return fd_; }
+  int operator*() const { return get(); }
+
+  explicit operator bool() const noexcept { return fd_ >= 0; }
+
+  int release() noexcept {
+    int ret = fd_;
+    fd_ = -1;
+    return ret;
+  }
+
+  void reset(int fd = -1);
+
+private:
+  unique_fd(unique_fd const&) = delete;
+  unique_fd& operator=(unique_fd const&) = delete;
+
+  int fd_;
+};
+
+#endif  // UNIQUE_FD_HH