Rearrange sources (#4997)

include/xrpl/json/Output.h

@@ -0,0 +1,59 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_JSON_OUTPUT_H_INCLUDED
+#define RIPPLE_JSON_OUTPUT_H_INCLUDED
+
+#include <boost/beast/core/string.hpp>
+#include <functional>
+#include <string>
+
+namespace Json {
+
+class Value;
+
+using Output = std::function<void(boost::beast::string_view const&)>;
+
+inline Output
+stringOutput(std::string& s)
+{
+    return [&](boost::beast::string_view const& b) {
+        s.append(b.data(), b.size());
+    };
+}
+
+/** Writes a minimal representation of a Json value to an Output in O(n) time.
+
+    Data is streamed right to the output, so only a marginal amount of memory is
+    used.  This can be very important for a very large Json::Value.
+ */
+void
+outputJson(Json::Value const&, Output const&);
+
+/** Return the minimal string representation of a Json::Value in O(n) time.
+
+    This requires a memory allocation for the full size of the output.
+    If possible, use outputJson().
+ */
+std::string
+jsonAsString(Json::Value const&);
+
+}  // namespace Json
+
+#endif