make_mchain.hpp

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/*
 * SObjectizer-5
 */
 
/*!
 * \file
 * \brief A helper function for the creation of a new mchain.
 *
 * \since
 * v.5.7.0
 */
 
#pragma once
 
#include <so_5/impl/mchain_details.hpp>
#include <so_5/impl/msg_tracing_helpers.hpp>
 
namespace so_5
{
 
namespace impl
{
 
/*!
 * \brief Helper function for creation of a new mchain with respect
 * to message tracing.
 *
 * This function was in mbox_core.cpp file until v.5.7.0 and is
 * placed in a separate header file in v.5.7.0.
 *
 * \tparam Q type of demand queue to be used for new mchain.
 * \tparam A type of arguments for mchain_template constructor.
 */
template< typename Q, typename... A >
[[nodiscard]] mchain_t
make_mchain(
  outliving_reference_t< so_5::msg_tracing::holder_t > tracer,
  const mchain_params_t & params,
  A &&... args )
  {
    using namespace so_5::mchain_props;
    using namespace so_5::impl::msg_tracing_helpers;
    using D = mchain_tracing_disabled_base;
    using E = mchain_tracing_enabled_base;
 
    if( tracer.get().is_msg_tracing_enabled()
        && !params.msg_tracing_disabled() )
      return mchain_t{
          new mchain_template< Q, E >{
            std::forward<A>(args)...,
            params,
            tracer } };
    else
      return mchain_t{
          new mchain_template< Q, D >{
            std::forward<A>(args)..., params } };
  }
 
} /* namespace impl */
 
} /* namespace so_5 */