C++20 fixes

utils/loggingcpp/format.h

@@ -0,0 +1,92 @@
+/*
+   Copyright (c) 2021 MariaDB Corporation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+*/
+
+#pragma once
+
+#include <boost/any.hpp>
+#include <cstdint>
+#include <regex>
+#include <stdexcept>
+#include <string>
+
+namespace logging
+{
+template <class T, class Iter>
+void formatOne(std::string& errMsg, Iter iter, uint32_t position)
+{
+  T arg = boost::any_cast<T>(*iter);
+  std::string token = std::string("%") + std::to_string(position) + std::string("%");
+  size_t index = 0;
+
+  while (true)
+  {
+    index = errMsg.find(token, index);
+    if (index == std::string::npos)
+      break;
+
+    if constexpr (std::is_same_v<T, std::string>)
+    {
+      errMsg.replace(index, token.length(), arg);
+    }
+    else
+    {
+      errMsg.replace(index, token.length(), std::to_string(arg));
+    }
+
+    index += token.length();
+  }
+}
+
+template <class T>
+void formatMany(std::string& errMsg, const T& args)
+{
+  auto iter = args.begin();
+  auto end = args.end();
+  uint32_t position = 1;
+
+  while (iter != end)
+  {
+    if (iter->type() == typeid(long))
+    {
+      formatOne<long>(errMsg, iter, position);
+    }
+    else if (iter->type() == typeid(uint64_t))
+    {
+      formatOne<uint64_t>(errMsg, iter, position);
+    }
+    else if (iter->type() == typeid(double))
+    {
+      formatOne<double>(errMsg, iter, position);
+    }
+    else if (iter->type() == typeid(std::string))
+    {
+      formatOne<std::string>(errMsg, iter, position);
+    }
+    else
+    {
+      throw std::logic_error("logggin::format: unexpected type in argslist");
+    }
+    ++iter;
+    ++position;
+  }
+  static std::regex restToken("%[0-9]%");
+  errMsg = std::regex_replace(errMsg, restToken, "");
+}
+
+}  // namespace logging