update to jsoncons to bbaf3b73b (0.172.1 + additional commits)

- see danielaparker/jsoncons#471

inst/include/jsoncons/allocator_holder.hpp

@@ -1,4 +1,4 @@
-// Copyright 2013 Daniel Parker
+// Copyright 2013-2023 Daniel Parker
 // Distributed under the Boost license, Version 1.0.
 // (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 

inst/include/jsoncons/allocator_set.hpp

@@ -0,0 +1,66 @@
+// Copyright 2013-2023 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_ALLOCATOR_STRATEGY_HPP
+#define JSONCONS_ALLOCATOR_STRATEGY_HPP
+
+#include <memory>
+#include <jsoncons/tag_type.hpp>
+
+namespace jsoncons {
+
+template <class Allocator,class TempAllocator>
+class allocator_set
+{
+    Allocator result_alloc_;
+    TempAllocator temp_alloc_;
+public:
+    using allocator_type = Allocator;
+    using temp_allocator_type = TempAllocator;
+
+    allocator_set(const Allocator& alloc=Allocator(), 
+        const TempAllocator& temp_alloc=TempAllocator())
+        : result_alloc_(alloc), temp_alloc_(temp_alloc)
+    {
+    }
+
+    allocator_set(const allocator_set&)  = default;
+    allocator_set(allocator_set&&)  = default;
+    allocator_set& operator=(const allocator_set&)  = delete;
+    allocator_set& operator=(allocator_set&&)  = delete;
+    ~allocator_set() = default;
+
+    Allocator get_allocator() const {return result_alloc_;}
+    TempAllocator get_temp_allocator() const {return temp_alloc_;}
+};
+
+inline
+allocator_set<std::allocator<char>,std::allocator<char>> combine_allocators()
+{
+    return allocator_set<std::allocator<char>,std::allocator<char>>(std::allocator<char>(), std::allocator<char>());
+}
+
+template <class Allocator>
+allocator_set<Allocator,std::allocator<char>> combine_allocators(const Allocator& alloc)
+{
+    return allocator_set<Allocator,std::allocator<char>>(alloc, std::allocator<char>());
+}
+
+template <class Allocator,class TempAllocator>
+allocator_set<Allocator,TempAllocator> combine_allocators(const Allocator& alloc, const TempAllocator& temp_alloc)
+{
+    return allocator_set<Allocator,TempAllocator>(alloc, temp_alloc);
+}
+
+template <class TempAllocator>
+allocator_set<std::allocator<char>,TempAllocator> temp_allocator_only(const TempAllocator& temp_alloc)
+{
+    return allocator_set<std::allocator<char>,TempAllocator>(std::allocator<char>(), temp_alloc);
+}
+
+} // namespace jsoncons
+
+#endif