Rearrange sources (#4997)

src/libxrpl/protocol/QualityFunction.cpp

@@ -0,0 +1,59 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2023 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.
+*/
+//==============================================================================
+
+#include <ripple/protocol/QualityFunction.h>
+
+#include <ripple/protocol/Quality.h>
+
+namespace ripple {
+
+QualityFunction::QualityFunction(
+    Quality const& quality,
+    QualityFunction::CLOBLikeTag)
+    : m_(0), b_(0), quality_(quality)
+{
+    if (quality.rate() <= beast::zero)
+        Throw<std::runtime_error>("QualityFunction quality rate is 0.");
+    b_ = 1 / quality.rate();
+}
+
+void
+QualityFunction::combine(QualityFunction const& qf)
+{
+    m_ += b_ * qf.m_;
+    b_ *= qf.b_;
+    if (m_ != 0)
+        quality_ = std::nullopt;
+}
+
+std::optional<Number>
+QualityFunction::outFromAvgQ(Quality const& quality)
+{
+    if (m_ != 0 && quality.rate() != beast::zero)
+    {
+        saveNumberRoundMode rm(Number::setround(Number::rounding_mode::upward));
+        auto const out = (1 / quality.rate() - b_) / m_;
+        if (out <= 0)
+            return std::nullopt;
+        return out;
+    }
+    return std::nullopt;
+}
+
+}  // namespace ripple