at_scope_exit.hpp

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/*
 * SObjectizer-5, RESTinio
 */

/*!
 * @file
 * @brief A simple implementation of %at_scope_exit concept.
 *
 * @note
 * This code is borrowed from SObjectizer project:
 * https://github.com/stiffstream/sobjectizer
 *
 * @since
 * v.0.6.4
 */

#pragma once

#include <utility>

namespace restinio {

namespace utils {

namespace scope_exit_details {

/*!
 * \brief Helper class for scope exit implementation.
 */
template< typename L >
class at_exit_t
    {
        L m_lambda;
    public :
        at_exit_t( L && l ) : m_lambda{ std::forward<L>(l) } {}
        at_exit_t( at_exit_t && o ) : m_lambda{ std::move(o.m_lambda) } {}
        ~at_exit_t() { m_lambda(); }
    };

} /* namespace scope_exit_details */

/*!
 * \brief Helper function for creation action to be performed at scope exit.
 *
 * Usage example:
 * \code
    if( needs_wait )
    {
        m_threads_to_wakeup += 1;
        auto decrement_threads = at_scope_exit( [&m_threads_to_wakeup] {
            --m_threads_to_wakeup;
        } );
        m_sleep_cond.wait_for( some_time, some_predicate );
    }
 * \endcode
 *
 */
template< typename L >
scope_exit_details::at_exit_t< L >
at_scope_exit( L && l )
    {
        return scope_exit_details::at_exit_t<L>{ std::forward<L>(l) };
    }

} /* namespace utils */

} /* namespace restinio */