1 files changed, 0 insertions, 96 deletions
diff --git a/butl/optional b/butl/optional
deleted file mode 100644
index f6cc15e..0000000
--- a/butl/optional
+++ /dev/null
@@ -1,96 +0,0 @@
-// file      : butl/optional -*- C++ -*-
-// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
-// license   : MIT; see accompanying LICENSE file
-
-#ifndef BUTL_OPTIONAL
-#define BUTL_OPTIONAL
-
-#include <utility>    // move()
-#include <functional> // hash
-
-namespace butl
-{
-  // Simple optional class template while waiting for std::optional.
-  //
-  struct nullopt_t {constexpr explicit nullopt_t (int) {}};
-  constexpr const nullopt_t nullopt (1);
-
-  template <typename T>
-  class optional
-  {
-  public:
-    typedef T value_type;
-
-    constexpr optional (): value_ (), null_ (true) {} // VC14 needs value_().
-    constexpr optional (nullopt_t): value_ (), null_ (true) {}
-    constexpr optional (const T& v): value_ (v), null_ (false) {}
-    constexpr optional (T&& v): value_ (std::move (v)), null_ (false) {}
-
-    optional& operator= (nullopt_t) {value_ = T (); null_ = true; return *this;}
-    optional& operator= (const T& v) {value_ = v; null_ = false; return *this;}
-    optional& operator= (T&& v) {value_ = std::move (v); null_ = false; return *this;}
-
-    T&       value () {return value_;}
-    const T& value () const {return value_;}
-
-    T*       operator-> () {return &value_;}
-    const T* operator-> () const {return &value_;}
-
-    T&       operator* () {return value_;}
-    const T& operator* () const {return value_;}
-
-    bool         has_value () const {return !null_;}
-    explicit operator bool () const {return !null_;}
-
-  private:
-    T value_;
-    bool null_;
-  };
-
-  template <typename T>
-  inline auto
-  operator== (const optional<T>& x, const optional<T>& y) -> decltype (*x == *y)
-  {
-    return static_cast<bool> (x) == static_cast<bool> (y) && (!x || *x == *y);
-  }
-
-  template <typename T>
-  inline auto
-  operator!= (const optional<T>& x, const optional<T>& y) -> decltype (x == y)
-  {
-    return !(x == y);
-  }
-
-  template <typename T>
-  inline auto
-  operator< (const optional<T>& x, const optional<T>& y) -> decltype (*x < *y)
-  {
-    bool px (x), py (y);
-    return px < py || (px && py && *x < *y);
-  }
-
-  template <typename T>
-  inline auto
-  operator> (const optional<T>& x, const optional<T>& y) -> decltype (*x > *y)
-  {
-    return y < x;
-  }
-}
-
-namespace std
-{
-  template <typename T>
-  struct hash<butl::optional<T>>: hash<T>
-  {
-    using argument_type = butl::optional<T>;
-
-    size_t
-    operator() (const butl::optional<T>& o) const
-      noexcept (noexcept (hash<T> {} (*o)))
-    {
-      return o ? hash<T>::operator() (*o) : static_cast<size_t> (-3333);
-    }
-  };
-}
-
-#endif // BUTL_OPTIONAL