From 63c2e854ed2c9778ea9225d86578b4e9b65900ee Mon Sep 17 00:00:00 2001
From: Ben Longbons <b.r.longbons@gmail.com>
Date: Fri, 27 Jun 2014 18:10:48 -0700
Subject: Port the Variant junk

---
 src/sexpr/variant.hpp | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/sexpr/variant.hpp

(limited to 'src/sexpr/variant.hpp')

diff --git a/src/sexpr/variant.hpp b/src/sexpr/variant.hpp
new file mode 100644
index 0000000..ccbfeaa
--- /dev/null
+++ b/src/sexpr/variant.hpp
@@ -0,0 +1,119 @@
+#ifndef TMWA_SEXPR_VARIANT_HPP
+#define TMWA_SEXPR_VARIANT_HPP
+//    variant.hpp - A single value, multiple type container. Better than boost's.
+//
+//    Copyright © 2012 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# include <type_traits>
+# include <cstdint>
+# include <cstddef>
+# include <utility>
+
+# include "union.hpp"
+# include "void.hpp"
+
+# include "fwd.hpp"
+
+
+namespace tmwa
+{
+namespace sexpr
+{
+# define JOIN(a, b) a##b
+
+# define WITH_VAR(ty, var, expr)                                \
+    for (bool JOIN(var, _guard) = true; JOIN(var, _guard); )    \
+        for (ty var = expr; JOIN(var, _guard); JOIN(var, _guard) = false)
+# define MATCH(expr)                    \
+    WITH_VAR(auto&&, _match_var, expr)  \
+    switch (tmwa::sexpr::VariantFriend::get_state(_match_var))
+# define CASE(ty, var)                                                          \
+    break;                                                                      \
+    case tmwa::sexpr::VariantFriend::get_state_for<ty, decltype(_match_var)>(): \
+    WITH_VAR(ty, var, tmwa::sexpr::VariantFriend::unchecked_get<ty>(_match_var))
+
+    template<class... T>
+    class Variant
+    {
+        static_assert(sizeof...(T), "A variant must not be empty");
+    };
+    template<class D, class... T>
+    class Variant<D, T...>
+    {
+        constexpr static size_t state_count = 1 + sizeof...(T);
+
+        // simplify things immensely
+        friend class VariantFriend;
+
+        typedef Union<D, T...> DataType;
+        DataType data;
+        size_t state;
+
+        void do_destruct();
+        template<class C, class... A>
+        void do_construct(A&&... a);
+    public:
+        Variant();
+        ~Variant();
+
+        void reset();
+        template<class C, class... A>
+        void emplace(A&&... a);
+
+        Variant(const Variant& r);
+        Variant(Variant&& r);
+        Variant& operator = (const Variant& r);
+        Variant& operator = (Variant&& r);
+
+        template<class E>
+        Variant(E e)
+        {
+            do_construct<E, E>(std::move(e));
+        }
+
+        template<class E>
+        Variant& operator = (E e)
+        {
+            emplace<E, E>(std::move(e));
+            return *this;
+        }
+
+        // use these ONLY if only one type makes sense
+        // otherwise use apply
+        template<class E>
+        bool is() const;
+
+        template<class E>
+        E *get_if();
+
+        template<class E>
+        const E *get_if() const;
+    };
+
+    template<class R, class F>
+    void apply(R& r, F&& f);
+    template<class R, class F, class V1, class... V>
+    void apply(R& r, F&& f, V1&& v1, V&&... v);
+    template<class F, class... V>
+    void apply(Void&& r, F&& f, V&&... v);
+} // namespace sexpr
+} // namespace tmwa
+
+# include "variant.tcc"
+
+#endif //TMWA_SEXPR_VARIANT_HPP
-- 
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