Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2006 Joao Abecasis
+    http://spirit.sourceforge.net/
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#if !defined(BOOST_SPIRIT_STATIC_HPP)
+#define BOOST_SPIRIT_STATIC_HPP
+
+#include <boost/noncopyable.hpp>
+#include <boost/call_traits.hpp>
+#include <boost/aligned_storage.hpp>
+
+#include <boost/type_traits/add_pointer.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+
+#include <boost/thread/once.hpp>
+
+#include <memory>   // for placement new
+
+#include <boost/spirit/home/classic/namespace.hpp>
+
+namespace boost { namespace spirit {
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+    //
+    //  Provides thread-safe initialization of a single static instance of T.
+    //
+    //  This instance is guaranteed to be constructed on static storage in a
+    //  thread-safe manner, on the first call to the constructor of static_.
+    //
+    //  Requirements:
+    //      T is default constructible
+    //          (There's an alternate implementation that relaxes this
+    //              requirement -- Joao Abecasis)
+    //      T::T() MUST not throw!
+    //          this is a requirement of boost::call_once.
+    //
+    template <class T, class Tag>
+    struct static_
+        : boost::noncopyable
+    {
+    private:
+
+        struct destructor
+        {
+            ~destructor()
+            {
+                static_::get_address()->~value_type();
+            }
+        };
+
+        struct default_ctor
+        {
+            static void construct()
+            {
+                ::new (static_::get_address()) value_type();
+                static destructor d;
+            }
+        };
+
+    public:
+
+        typedef T value_type;
+        typedef typename boost::call_traits<T>::reference reference;
+        typedef typename boost::call_traits<T>::const_reference const_reference;
+
+        static_(Tag = Tag())
+        {
+            boost::call_once(&default_ctor::construct, constructed_);
+        }
+
+        operator reference()
+        {
+            return this->get();
+        }
+
+        operator const_reference() const
+        {
+            return this->get();
+        }
+
+        reference get()
+        {
+            return *this->get_address();
+        }
+
+        const_reference get() const
+        {
+            return *this->get_address();
+        }
+
+    private:
+        typedef typename boost::add_pointer<value_type>::type pointer;
+
+        static pointer get_address()
+        {
+            return static_cast<pointer>(data_.address());
+        }
+
+        typedef boost::aligned_storage<sizeof(value_type),
+            boost::alignment_of<value_type>::value> storage_type;
+
+        static storage_type data_;
+        static once_flag constructed_;
+    };
+
+    template <class T, class Tag>
+    typename static_<T, Tag>::storage_type static_<T, Tag>::data_;
+
+    template <class T, class Tag>
+#ifndef BOOST_THREAD_PROVIDES_ONCE_CXX11
+    once_flag static_<T, Tag>::constructed_ = BOOST_ONCE_INIT;
+#else
+    once_flag static_<T, Tag>::constructed_;
+#endif
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}} // namespace BOOST_SPIRIT_CLASSIC_NS
+
+#endif // include guard