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diff --git a/include/jsoncons_ext/bson/bson_options.hpp b/include/jsoncons_ext/bson/bson_options.hpp
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+++ b/include/jsoncons_ext/bson/bson_options.hpp
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+// Copyright 2019 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_BSON_BSON_OPTIONS_HPP
+#define JSONCONS_BSON_BSON_OPTIONS_HPP
+
+#include <string>
+#include <limits> // std::numeric_limits
+#include <cwchar>
+#include <jsoncons/json_exception.hpp>
+#include <jsoncons_ext/bson/bson_type.hpp>
+
+namespace jsoncons { namespace bson {
+
+class bson_options;
+
+class bson_options_common
+{
+    friend class bson_options;
+
+    int max_nesting_depth_;
+protected:
+    virtual ~bson_options_common() = default;
+
+    bson_options_common()
+        : max_nesting_depth_(1024)
+    {
+    }
+
+    bson_options_common(const bson_options_common&) = default;
+    bson_options_common& operator=(const bson_options_common&) = default;
+    bson_options_common(bson_options_common&&) = default;
+    bson_options_common& operator=(bson_options_common&&) = default;
+public:
+    int max_nesting_depth() const 
+    {
+        return max_nesting_depth_;
+    }
+};
+
+class bson_decode_options : public virtual bson_options_common
+{
+    friend class bson_options;
+public:
+    bson_decode_options()
+    {
+    }
+};
+
+class bson_encode_options : public virtual bson_options_common
+{
+    friend class bson_options;
+public:
+    bson_encode_options()
+    {
+    }
+};
+
+class bson_options final : public bson_decode_options, public bson_encode_options
+{
+public:
+    using bson_options_common::max_nesting_depth;
+
+    bson_options& max_nesting_depth(int value)
+    {
+        this->max_nesting_depth_ = value;
+        return *this;
+    }
+};
+
+}}
+#endif