Added thirdparty: boost library

thirdparty/include/boost/json/detail/default_resource.hpp

@@ -0,0 +1,101 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
+//
+// 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)
+//
+// Official repository: https://github.com/boostorg/json
+//
+
+#ifndef BOOST_JSON_DEFAULT_RESOURCE_HPP
+#define BOOST_JSON_DEFAULT_RESOURCE_HPP
+
+#include <boost/json/detail/config.hpp>
+#include <new>
+
+namespace boost {
+namespace json {
+namespace detail {
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class
+#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class
+#endif
+
+// A simple memory resource that uses operator new and delete.
+class
+    BOOST_SYMBOL_VISIBLE
+    BOOST_JSON_DECL
+default_resource final
+    : public memory_resource
+{
+    union holder;
+
+#ifndef BOOST_JSON_WEAK_CONSTINIT
+# ifndef BOOST_JSON_NO_DESTROY
+    static holder instance_;
+# else
+    BOOST_JSON_NO_DESTROY
+    static default_resource instance_;
+# endif
+#endif
+
+public:
+    static
+    memory_resource*
+    get() noexcept
+    {
+    #ifdef BOOST_JSON_WEAK_CONSTINIT
+        static default_resource instance_;
+    #endif
+        return reinterpret_cast<memory_resource*>(
+            reinterpret_cast<std::uintptr_t*>(
+                &instance_));
+    }
+
+    ~default_resource();
+
+    void*
+    do_allocate(
+        std::size_t n,
+        std::size_t) override;
+
+    void
+    do_deallocate(
+        void* p,
+        std::size_t,
+        std::size_t) override;
+
+    bool
+    do_is_equal(
+        memory_resource const& mr) const noexcept override;
+};
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+union default_resource::
+    holder
+{
+#ifndef BOOST_JSON_WEAK_CONSTINIT
+    constexpr
+#endif
+    holder()
+        : mr()
+    {
+    }
+
+    ~holder()
+    {
+    }
+
+    default_resource mr;
+};
+
+} // detail
+} // namespace json
+} // namespace boost
+
+#endif