Added thirdparty: boost library

thirdparty/include/boost/mysql/impl/meta_check_context.ipp

@@ -0,0 +1,58 @@
+//
+// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_MYSQL_IMPL_META_CHECK_CONTEXT_IPP
+#define BOOST_MYSQL_IMPL_META_CHECK_CONTEXT_IPP
+
+#pragma once
+
+#include <boost/mysql/detail/typing/meta_check_context.hpp>
+
+void boost::mysql::detail::meta_check_context::add_field_absent_error()
+{
+    auto& stream = add_error();
+    stream << "Field ";
+    insert_field_name(stream);
+    if (has_field_names(name_table_))
+    {
+        stream << " is not present in the data returned by the server";
+    }
+    else
+    {
+        stream << " can't be mapped: there are more fields in your C++ data type than in your query";
+    }
+}
+
+void boost::mysql::detail::meta_check_context::add_type_mismatch_error(const char* cpp_type_name)
+{
+    auto& stream = add_error();
+    stream << "Incompatible types for field ";
+    insert_field_name(stream);
+    stream << ": C++ type '" << cpp_type_name << "' is not compatible with DB type '"
+           << column_type_to_str(current_meta()) << "'";
+}
+
+void boost::mysql::detail::meta_check_context::add_nullability_error()
+{
+    auto& stream = add_error();
+    stream << "NULL checks failed for field ";
+    insert_field_name(stream);
+    stream << ": the database type may be NULL, but the C++ type cannot. Use std::optional<T> or "
+              "boost::optional<T>";
+}
+
+boost::mysql::error_code boost::mysql::detail::meta_check_context::check_errors(diagnostics& diag) const
+{
+    if (errors_ != nullptr)
+    {
+        access::get_impl(diag).assign_client(errors_->str());
+        return client_errc::metadata_check_failed;
+    }
+    return error_code();
+}
+
+#endif