From fea03e59c2570baaaef6dfaf01cd3ee095402e1e Mon Sep 17 00:00:00 2001
From: Michał Cichoń <michcic@gmail.com>
Date: Sat, 5 Dec 2015 14:27:47 +0100
Subject: Add player based on Windows Media Foundation.

---
 src/player/backends/utility/optional.h | 517 +++++++++++++++++++++++++++++++++
 1 file changed, 517 insertions(+)
 create mode 100644 src/player/backends/utility/optional.h

(limited to 'src/player/backends/utility/optional.h')

diff --git a/src/player/backends/utility/optional.h b/src/player/backends/utility/optional.h
new file mode 100644
index 0000000..9ee0b71
--- /dev/null
+++ b/src/player/backends/utility/optional.h
@@ -0,0 +1,517 @@
+//------------------------------------------------------------------------------
+//
+//------------------------------------------------------------------------------
+# ifndef __TD__OPTIONAL_H__
+# define __TD__OPTIONAL_H__
+# pragma once
+
+# include <type_traits>
+# include <utility>
+# include <cassert>
+
+
+//------------------------------------------------------------------------------
+struct nullopt_t
+{
+    struct init {};
+    nullopt_t(init) {}
+};
+
+const nullopt_t nullopt((nullopt_t::init()));
+
+template <typename T>
+struct optional
+{
+private:
+    typedef typename std::aligned_storage<sizeof(T), std::alignment_of<T>::value>::type storage_type;
+
+    typedef void (optional::*bool_type)() const;
+    void safe_bool() const { }
+
+
+public:
+    optional();
+    optional(nullopt_t);
+    optional(const optional& v);
+    optional(optional&& v);
+    optional(const T& v);
+    optional(T&& v);
+    ~optional();
+
+    operator bool_type() const;
+
+    optional& operator=(nullopt_t);
+
+    optional& operator=(const optional& other);
+    optional& operator=(optional&& other);
+
+    // The function does not participate in overload resolution unless std::is_same<std::decay_t<U>, T>::value is true
+    template <typename U>
+    // optional& operator=(U&& value);
+    optional& operator=(typename std::enable_if<std::is_same<typename std::decay<U>::type, T>::value, U>::type&& value);
+
+          T* operator->();
+    const T* operator->() const;
+          T& operator*();
+    const T& operator*() const;
+
+          T& value();
+    const T& value() const;
+
+# if defined(_MSC_VER) && (_MSC_VER > 1600)
+    template <typename U>
+    T value_or(U&& default_value) const &;
+
+    template <typename U>
+    T value_or(U&& default_value) &&;
+# else
+    T value_or(const T& default_value);
+    T value_or(const T& default_value) const;
+# endif
+
+    bool has_value() const;
+
+    void swap(optional& other);
+
+private:
+          T* value_ptr()       { return reinterpret_cast<      T*>(&_value); }
+    const T* value_ptr() const { return reinterpret_cast<const T*>(&_value); }
+
+          T& value_ref()       { return *value_ptr(); }
+    const T& value_ref() const { return *value_ptr(); }
+
+    bool            _has_value;
+    storage_type    _value;
+# if defined(_DEBUG)
+    const T&        _preview;
+# endif
+};
+
+
+//------------------------------------------------------------------------------
+template <typename T>
+inline optional<T>::optional():
+    _has_value(false)
+# if defined(_DEBUG)
+    ,_preview(value_ref())
+# endif
+{
+}
+
+template <typename T>
+inline optional<T>::optional(nullopt_t):
+    _has_value(false)
+# if defined(_DEBUG)
+    , _preview(value_ref())
+# endif
+{
+}
+
+template <typename T>
+inline optional<T>::optional(const optional& v):
+    _has_value(v._has_value)
+# if defined(_DEBUG)
+    , _preview(value_ref())
+# endif
+{
+    if (_has_value)
+        new (value_ptr()) T(v.value_ref());
+}
+
+template <typename T>
+inline optional<T>::optional(optional&& v):
+    _has_value(v._has_value)
+# if defined(_DEBUG)
+    , _preview(value_ref())
+# endif
+{
+    if (!_has_value)
+        return;
+
+    new (value_ptr()) T(std::move(v.value_ref()));
+    v.value_ref().~T();
+
+    v._has_value = false;
+}
+
+template <typename T>
+inline optional<T>::optional(const T& v):
+    _has_value(true)
+# if defined(_DEBUG)
+    , _preview(value_ref())
+# endif
+{
+    new (value_ptr()) T(v);
+}
+
+template <typename T>
+inline optional<T>::optional(T&& v):
+    _has_value(true)
+# if defined(_DEBUG)
+    , _preview(value_ref())
+# endif
+{
+    new (value_ptr()) T(std::forward<T>(v));
+}
+
+template <typename T>
+inline optional<T>::~optional()
+{
+    if (_has_value)
+        value_ref().~T();
+}
+
+template <typename T>
+inline optional<T>::operator bool_type() const
+{
+    return _has_value ? &optional::safe_bool : nullptr;
+}
+
+template <typename T>
+inline optional<T>& optional<T>::operator= (nullopt_t)
+{
+    optional().swap(*this);
+    _has_value = false;
+    return *this;
+}
+
+template <typename T>
+inline optional<T>& optional<T>::operator=(const optional& other)
+{
+    optional(other).swap(*this);
+    return *this;
+}
+
+template <typename T>
+inline optional<T>& optional<T>::operator=(optional&& other)
+{
+    optional(std::forward<optional>(other)).swap(*this);
+    return *this;
+}
+
+template <typename T>
+template <typename U>
+inline optional<T>& optional<T>::operator=(typename std::enable_if<std::is_same<typename std::decay<U>::type, T>::value, U>::type&& value)
+{
+    optional<T>(value).swap(*this);
+    return *this;
+}
+
+
+template <typename T>
+inline T* optional<T>::operator->()
+{
+    assert(_has_value);
+    return value_ptr();
+}
+
+template <typename T>
+inline const T* optional<T>::operator->() const
+{
+    assert(_has_value);
+    return value_ptr();
+}
+
+template <typename T>
+inline T& optional<T>::operator*()
+{
+    assert(_has_value);
+    return value_ref();
+}
+
+template <typename T>
+inline const T& optional<T>::operator*() const
+{
+    assert(_has_value);
+    return value_ref();
+}
+
+template <typename T>
+inline T& optional<T>::value()
+{
+    assert(_has_value);
+    return value_ref();
+}
+
+template <typename T>
+inline const T& optional<T>::value() const
+{
+    assert(_has_value);
+    return value_ref();
+}
+
+# if defined(_MSC_VER) && (_MSC_VER > 1600)
+template <typename T>
+template <typename U>
+inline T optional<T>::value_or(U&& default_value) const &
+{
+    return bool(*this) ? value_ref() : static_cast<T>(std::forward<U>(default_value));
+}
+
+template <typename T>
+template <typename U>
+inline T optional<T>::value_or(U&& default_value) &&
+{
+    return bool(*this) ? std::move(value_ref()) : static_cast<T>(std::forward<U>(default_value));
+}
+# else
+template <typename T>
+T optional<T>::value_or(const T& default_value)
+{
+    return _has_value ? value_ref() : default_value;
+}
+
+template <typename T>
+T optional<T>::value_or(const T& default_value) const
+{
+    return _has_value ? value_ref() : default_value;
+}
+# endif
+
+template <typename T>
+inline bool optional<T>::has_value() const
+{
+    return _has_value;
+}
+
+template <typename T>
+inline void optional<T>::swap(optional& other)
+{
+    using std::swap;
+
+    if (_has_value && other._has_value)
+    {
+        swap(value_ref(), other.value_ref());
+    }
+    else if (_has_value && !other._has_value)
+    {
+        new (other.value_ptr()) T(std::forward<T>(value_ref()));
+
+        value_ref().~T();
+
+        _has_value = false;
+        other._has_value = true;
+    }
+    else if (!_has_value && other._has_value)
+    {
+        new (value_ptr()) T(std::forward<T>(other.value_ref()));
+
+        other.value_ref().~T();
+
+        _has_value = true;
+        other._has_value = false;
+    }
+}
+
+
+//------------------------------------------------------------------------------
+template <typename T>
+optional<T> make_optional(T&& v)
+{
+    return optional<T>(std::forward<T>(v));
+}
+
+template <typename T>
+inline void swap(optional<T>& lhs, optional<T>& rhs)
+{
+    lhs.swap(rhs);
+}
+
+template <typename T>
+inline bool operator==(const optional<T>& lhs, const optional<T>& rhs)
+{
+    if (static_cast<bool>(lhs) != static_cast<bool>(rhs))
+        return false;
+    if (!static_cast<bool>(lhs))
+        return true;
+    return *lhs == *rhs;
+}
+
+template <typename T>
+bool operator!=(const optional<T>& lhs, const optional<T>& rhs)
+{
+    return !(lhs == rhs);
+}
+
+template <typename T>
+inline bool operator<(const optional<T>& lhs, const optional<T>& rhs)
+{
+    if (!static_cast<bool>(rhs))
+        return false;
+    if (!static_cast<bool>(lhs))
+        return true;
+    return *lhs < *rhs;
+}
+
+template <typename T>
+inline bool operator>(const optional<T>& lhs, const optional<T>& rhs)
+{
+    return rhs < lhs;
+}
+
+template <typename T>
+inline bool operator<=(const optional<T>& lhs, const optional<T>& rhs)
+{
+    return !(rhs < lhs);
+}
+
+template <typename T>
+inline bool operator>=(const optional<T>& lhs, const optional<T>& rhs)
+{
+    return !(lhs < rhs);
+}
+
+template <typename T>
+inline bool operator==(const optional<T>& opt, nullopt_t)
+{
+    return !static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator==(nullopt_t, const optional<T>& opt)
+{
+    return static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator!=(const optional<T>& opt, nullopt_t)
+{
+    return static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator!=(nullopt_t, const optional<T>& opt)
+{
+    return !static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator<(const optional<T>& opt, nullopt_t)
+{
+    return false;
+}
+
+template <typename T>
+inline bool operator<(nullopt_t, const optional<T>& opt)
+{
+    return static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator<=(const optional<T>& opt, nullopt_t)
+{
+    return !opt;
+}
+
+template <typename T>
+inline bool operator<=(nullopt_t, const optional<T>& opt)
+{
+    return true;
+}
+
+template <typename T>
+inline bool operator>(const optional<T>& opt, nullopt_t)
+{
+    return static_cast<bool>(opt);
+}
+
+template <typename T>
+inline bool operator>(nullopt_t, const optional<T>& opt)
+{
+    return false;
+}
+
+template <typename T>
+inline bool operator>=(const optional<T>&, nullopt_t)
+{
+    return true;
+}
+
+template <typename T>
+inline bool operator>=(nullopt_t, const optional<T>& opt)
+{
+    return !opt;
+}
+
+template <typename T>
+inline bool operator==(const optional<T>& opt, const T& v)
+{
+    return static_cast<bool>(opt) ? *opt == v : false;
+}
+
+template <typename T>
+inline bool operator==(const T& v, const optional<T>& opt)
+{
+    return static_cast<bool>(opt) ? *opt == v : false;
+}
+
+template <typename T>
+inline bool operator!=(const optional<T>& opt, const T& v)
+{
+    return static_cast<bool>(opt) ? *opt != v : true;
+}
+
+template <typename T>
+inline bool operator!=(const T& v, const optional<T>& opt)
+{
+    return static_cast<bool>(opt) ? *opt != v : true;
+}
+
+template <typename T>
+inline bool operator<(const optional<T>& opt, const T& v)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? less<T>(*opt, v) : true;
+}
+
+template <typename T>
+inline bool operator<(const T& v, const optional<T>& opt)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? less<T>(v, *opt) : false;
+}
+
+template <typename T>
+inline bool operator<=(const optional<T>& opt, const T& v)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? less_equal<T>(*opt, v) : true;
+}
+
+template <typename T>
+inline bool operator<=(const T& v, const optional<T>& opt)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? less_equal<T>(v, *opt) : false;
+}
+
+template <typename T>
+inline bool operator>(const optional<T>& opt, const T& v)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? greater<T>(*opt, v) : false;
+}
+
+template <typename T>
+inline bool operator>(const T& v, const optional<T>& opt)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? greater<T>(v, *opt) : true;
+}
+
+template <typename T>
+inline bool operator>=(const optional<T>& opt, const T& v)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? greater_equal<T>(*opt, v) : false;
+}
+
+template <typename T>
+inline bool operator>=(const T& v, const optional<T>& opt)
+{
+    using namespace std;
+    return static_cast<bool>(opt) ? greater_equal<T>(v, *opt) : true;
+}
+
+
+# endif // __TD__OPTIONAL_H__
-- 
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