834 lines
23 KiB
C++
834 lines
23 KiB
C++
#ifndef BOOST_LEAF_ERROR_HPP_INCLUDED
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#define BOOST_LEAF_ERROR_HPP_INCLUDED
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// Copyright 2018-2023 Emil Dotchevski and Reverge Studios, Inc.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/leaf/config.hpp>
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#include <boost/leaf/detail/optional.hpp>
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#include <boost/leaf/detail/function_traits.hpp>
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#include <boost/leaf/detail/capture_list.hpp>
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#include <boost/leaf/detail/print.hpp>
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#if BOOST_LEAF_CFG_DIAGNOSTICS
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# include <ostream>
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#endif
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#if BOOST_LEAF_CFG_STD_SYSTEM_ERROR
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# include <system_error>
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#endif
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#if BOOST_LEAF_CFG_CAPTURE
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# include <memory>
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#endif
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#define BOOST_LEAF_TOKEN_PASTE(x, y) x ## y
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#define BOOST_LEAF_TOKEN_PASTE2(x, y) BOOST_LEAF_TOKEN_PASTE(x, y)
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#define BOOST_LEAF_TMP BOOST_LEAF_TOKEN_PASTE2(boost_leaf_tmp_, __LINE__)
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#define BOOST_LEAF_ASSIGN(v,r)\
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auto && BOOST_LEAF_TMP = r;\
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static_assert(::boost::leaf::is_result_type<typename std::decay<decltype(BOOST_LEAF_TMP)>::type>::value,\
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"BOOST_LEAF_ASSIGN/BOOST_LEAF_AUTO requires a result object as the second argument (see is_result_type)");\
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if( !BOOST_LEAF_TMP )\
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return BOOST_LEAF_TMP.error();\
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v = std::forward<decltype(BOOST_LEAF_TMP)>(BOOST_LEAF_TMP).value()
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#define BOOST_LEAF_AUTO(v, r)\
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BOOST_LEAF_ASSIGN(auto v, r)
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#if BOOST_LEAF_CFG_GNUC_STMTEXPR
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#define BOOST_LEAF_CHECK(r)\
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({\
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auto && BOOST_LEAF_TMP = (r);\
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static_assert(::boost::leaf::is_result_type<typename std::decay<decltype(BOOST_LEAF_TMP)>::type>::value,\
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"BOOST_LEAF_CHECK requires a result object (see is_result_type)");\
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if( !BOOST_LEAF_TMP )\
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return BOOST_LEAF_TMP.error();\
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std::move(BOOST_LEAF_TMP);\
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}).value()
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#else
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#define BOOST_LEAF_CHECK(r)\
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{\
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auto && BOOST_LEAF_TMP = (r);\
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static_assert(::boost::leaf::is_result_type<typename std::decay<decltype(BOOST_LEAF_TMP)>::type>::value,\
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"BOOST_LEAF_CHECK requires a result object (see is_result_type)");\
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if( !BOOST_LEAF_TMP )\
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return BOOST_LEAF_TMP.error();\
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}
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#endif
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#define BOOST_LEAF_NEW_ERROR ::boost::leaf::leaf_detail::inject_loc{__FILE__,__LINE__,__FUNCTION__}+::boost::leaf::new_error
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namespace boost { namespace leaf {
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struct BOOST_LEAF_SYMBOL_VISIBLE e_source_location
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{
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char const * file;
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int line;
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char const * function;
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template <class CharT, class Traits>
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friend std::ostream & operator<<( std::basic_ostream<CharT, Traits> & os, e_source_location const & x )
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{
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return os << leaf::type<e_source_location>() << ": " << x.file << '(' << x.line << ") in function " << x.function;
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}
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};
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////////////////////////////////////////
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class BOOST_LEAF_SYMBOL_VISIBLE error_id;
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namespace leaf_detail
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{
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template <class E>
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class BOOST_LEAF_SYMBOL_VISIBLE slot:
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optional<E>
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{
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slot( slot const & ) = delete;
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slot & operator=( slot const & ) = delete;
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using impl = optional<E>;
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slot<E> * prev_;
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public:
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BOOST_LEAF_CONSTEXPR slot() noexcept:
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prev_(nullptr)
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{
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}
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BOOST_LEAF_CONSTEXPR slot( slot && x ) noexcept:
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optional<E>(std::move(x)),
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prev_(nullptr)
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{
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BOOST_LEAF_ASSERT(x.prev_==nullptr);
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}
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~slot() noexcept
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{
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BOOST_LEAF_ASSERT(tls::read_ptr<slot<E>>() != this);
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}
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void activate() noexcept
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{
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prev_ = tls::read_ptr<slot<E>>();
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tls::write_ptr<slot<E>>(this);
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}
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void deactivate() const noexcept
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{
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tls::write_ptr<slot<E>>(prev_);
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}
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void unload( int err_id ) noexcept(!BOOST_LEAF_CFG_CAPTURE);
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template <class CharT, class Traits>
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void print( std::basic_ostream<CharT, Traits> & os, int err_id_to_print ) const
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{
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if( !diagnostic<E>::is_invisible )
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if( int k = this->key() )
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{
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if( err_id_to_print )
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{
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if( err_id_to_print!=k )
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return;
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}
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else
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os << '[' << k << "] ";
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diagnostic<E>::print(os, value(k));
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os << '\n';
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}
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}
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using impl::load;
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using impl::has_value;
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using impl::value;
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};
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}
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////////////////////////////////////////
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#if BOOST_LEAF_CFG_CAPTURE
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namespace leaf_detail
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{
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class BOOST_LEAF_SYMBOL_VISIBLE dynamic_allocator:
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capture_list
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{
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dynamic_allocator( dynamic_allocator const & ) = delete;
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dynamic_allocator & operator=( dynamic_allocator const & ) = delete;
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class capturing_node:
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public capture_list::node
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{
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protected:
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BOOST_LEAF_CONSTEXPR explicit capturing_node( capture_list::node * * & last ) noexcept:
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node(last)
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{
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BOOST_LEAF_ASSERT(last == &next_);
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BOOST_LEAF_ASSERT(next_ == nullptr);
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}
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public:
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virtual void deactivate() const noexcept = 0;
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};
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template <class E>
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class capturing_slot_node:
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public capturing_node,
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public slot<E>
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{
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using impl = slot<E>;
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capturing_slot_node( capturing_slot_node const & ) = delete;
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capturing_slot_node & operator=( capturing_slot_node const & ) = delete;
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void deactivate() const noexcept final override
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{
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impl::deactivate();
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}
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void unload( int err_id ) final override
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{
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impl::unload(err_id);
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}
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#if BOOST_LEAF_CFG_DIAGNOSTICS
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void print( std::ostream & os, int err_id_to_print ) const final override
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{
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impl::print(os, err_id_to_print);
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}
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#endif
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public:
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template <class T>
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BOOST_LEAF_CONSTEXPR capturing_slot_node( capture_list::node * * & last, int err_id, T && e ):
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capturing_node(last)
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{
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BOOST_LEAF_ASSERT(last == &next_);
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BOOST_LEAF_ASSERT(next_ == nullptr);
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impl::load(err_id, std::forward<T>(e));
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}
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};
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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class capturing_exception_node:
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public capturing_node
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{
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capturing_exception_node( capturing_exception_node const & ) = delete;
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capturing_exception_node & operator=( capturing_exception_node const & ) = delete;
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void deactivate() const noexcept final override
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{
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BOOST_LEAF_ASSERT(0);
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}
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void unload( int ) final override
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{
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std::rethrow_exception(ex_);
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}
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#if BOOST_LEAF_CFG_DIAGNOSTICS
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void print( std::ostream &, int err_id_to_print ) const final override
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{
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}
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#endif
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std::exception_ptr const ex_;
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public:
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capturing_exception_node( capture_list::node * * & last, std::exception_ptr && ex ) noexcept:
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capturing_node(last),
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ex_(std::move(ex))
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{
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BOOST_LEAF_ASSERT(last == &next_);
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BOOST_LEAF_ASSERT(ex_);
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}
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};
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#endif
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node * * last_;
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public:
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dynamic_allocator() noexcept:
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capture_list(nullptr),
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last_(&first_)
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{
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BOOST_LEAF_ASSERT(first_ == nullptr);
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}
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dynamic_allocator( dynamic_allocator && other ) noexcept:
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capture_list(std::move(other)),
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last_(other.last_ == &other.first_? &first_ : other.last_)
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{
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BOOST_LEAF_ASSERT(last_ != nullptr);
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BOOST_LEAF_ASSERT(*last_ == nullptr);
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BOOST_LEAF_ASSERT(other.first_ == nullptr);
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other.last_ = &other.first_;
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}
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template <class E>
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typename std::decay<E>::type & dynamic_load(int err_id, E && e)
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{
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using T = typename std::decay<E>::type;
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BOOST_LEAF_ASSERT(last_ != nullptr);
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BOOST_LEAF_ASSERT(*last_ == nullptr);
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BOOST_LEAF_ASSERT(tls::read_ptr<slot<T>>() == nullptr);
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capturing_slot_node<T> * csn = new capturing_slot_node<T>(last_, err_id, std::forward<E>(e));
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csn->activate();
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return csn->value(err_id);
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}
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void deactivate() const noexcept
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{
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for_each(
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[]( capture_list::node const & n )
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{
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static_cast<capturing_node const &>(n).deactivate();
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} );
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}
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template <class LeafResult>
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LeafResult extract_capture_list(int err_id) noexcept
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{
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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if( std::exception_ptr ex = std::current_exception() )
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(void) new capturing_exception_node(last_, std::move(ex));
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#endif
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leaf_detail::capture_list::node * const f = first_;
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first_ = nullptr;
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last_ = &first_;
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return { err_id, capture_list(f) };
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}
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using capture_list::unload;
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using capture_list::print;
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};
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template <>
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struct diagnostic<dynamic_allocator, false, false, false>
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{
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static constexpr bool is_invisible = true;
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template <class CharT, class Traits>
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BOOST_LEAF_CONSTEXPR static void print( std::basic_ostream<CharT, Traits> &, dynamic_allocator const & )
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{
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}
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};
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template <>
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inline void slot<dynamic_allocator>::deactivate() const noexcept
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{
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if( dynamic_allocator const * c = this->has_value() )
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c->deactivate();
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tls::write_ptr<slot<dynamic_allocator>>(prev_);
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}
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template <>
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inline void slot<dynamic_allocator>::unload( int err_id ) noexcept(false)
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{
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BOOST_LEAF_ASSERT(err_id);
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if( dynamic_allocator * da1 = this->has_value() )
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da1->unload(err_id);
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}
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template <class E>
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inline void dynamic_load_( int err_id, E && e )
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{
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if( slot<dynamic_allocator> * sl = tls::read_ptr<slot<dynamic_allocator>>() )
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{
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if( dynamic_allocator * c = sl->has_value() )
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c->dynamic_load(err_id, std::forward<E>(e));
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else
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sl->load(err_id).dynamic_load(err_id, std::forward<E>(e));
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}
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}
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template <class E, class F>
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inline void dynamic_accumulate_( int err_id, F && f )
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{
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if( slot<dynamic_allocator> * sl = tls::read_ptr<slot<dynamic_allocator>>() )
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{
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if( dynamic_allocator * c = sl->has_value(err_id) )
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(void) std::forward<F>(f)(c->dynamic_load(err_id, E{}));
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else
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(void) std::forward<F>(f)(sl->load(err_id).dynamic_load(err_id, E{}));
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}
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}
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template <bool OnError, class E>
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inline void dynamic_load( int err_id, E && e ) noexcept(OnError)
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{
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if( OnError )
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{
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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try
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{
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#endif
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dynamic_load_(err_id, std::forward<E>(e));
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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}
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catch(...)
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{
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}
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#endif
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}
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else
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dynamic_load_(err_id, std::forward<E>(e));
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}
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template <bool OnError, class E, class F>
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inline void dynamic_load_accumulate( int err_id, F && f ) noexcept(OnError)
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{
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if( OnError )
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{
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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try
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{
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#endif
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dynamic_accumulate_<E>(err_id, std::forward<F>(f));
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#ifndef BOOST_LEAF_NO_EXCEPTIONS
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}
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catch(...)
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{
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}
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#endif
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}
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else
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dynamic_accumulate_<E>(err_id, std::forward<F>(f));
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}
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}
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#endif
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////////////////////////////////////////
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namespace leaf_detail
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{
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template <class E>
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inline void slot<E>::unload( int err_id ) noexcept(!BOOST_LEAF_CFG_CAPTURE)
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{
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BOOST_LEAF_ASSERT(err_id);
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if( this->key()!=err_id )
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return;
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if( impl * p = tls::read_ptr<slot<E>>() )
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{
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if( !p->has_value(err_id) )
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*p = std::move(*this);
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}
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#if BOOST_LEAF_CFG_CAPTURE
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else
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dynamic_load<false>(err_id, std::move(*this).value(err_id));
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#endif
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}
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template <bool OnError, class E>
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BOOST_LEAF_CONSTEXPR inline int load_slot( int err_id, E && e ) noexcept(OnError)
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{
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using T = typename std::decay<E>::type;
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static_assert(!std::is_pointer<E>::value, "Error objects of pointer types are not allowed");
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static_assert(!std::is_same<T, error_id>::value, "Error objects of type error_id are not allowed");
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BOOST_LEAF_ASSERT((err_id&3)==1);
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if( slot<T> * p = tls::read_ptr<slot<T>>() )
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{
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if( !OnError || !p->has_value(err_id) )
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(void) p->load(err_id, std::forward<E>(e));
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}
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#if BOOST_LEAF_CFG_CAPTURE
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else
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dynamic_load<OnError>(err_id, std::forward<E>(e));
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#endif
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return 0;
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}
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template <bool OnError, class F>
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BOOST_LEAF_CONSTEXPR inline int load_slot_deferred( int err_id, F && f ) noexcept(OnError)
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{
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using E = typename function_traits<F>::return_type;
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using T = typename std::decay<E>::type;
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static_assert(!std::is_pointer<E>::value, "Error objects of pointer types are not allowed");
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static_assert(!std::is_same<T, error_id>::value, "Error objects of type error_id are not allowed");
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BOOST_LEAF_ASSERT((err_id&3)==1);
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if( slot<T> * p = tls::read_ptr<slot<T>>() )
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{
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if( !OnError || !p->has_value(err_id) )
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(void) p->load(err_id, std::forward<F>(f)());
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}
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#if BOOST_LEAF_CFG_CAPTURE
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else
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dynamic_load<OnError>(err_id, std::forward<F>(f)());
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#endif
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return 0;
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}
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template <bool OnError, class F>
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BOOST_LEAF_CONSTEXPR inline int load_slot_accumulate( int err_id, F && f ) noexcept(OnError)
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{
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static_assert(function_traits<F>::arity==1, "Lambdas passed to accumulate must take a single e-type argument by reference");
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using E = typename std::decay<fn_arg_type<F,0>>::type;
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static_assert(!std::is_pointer<E>::value, "Error objects of pointer types are not allowed");
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BOOST_LEAF_ASSERT((err_id&3)==1);
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if( auto sl = tls::read_ptr<slot<E>>() )
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{
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if( auto v = sl->has_value(err_id) )
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(void) std::forward<F>(f)(*v);
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else
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(void) std::forward<F>(f)(sl->load(err_id,E()));
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}
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#if BOOST_LEAF_CFG_CAPTURE
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else
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dynamic_load_accumulate<OnError, E>(err_id, std::forward<F>(f));
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#endif
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return 0;
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}
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}
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////////////////////////////////////////
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namespace leaf_detail
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{
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template <class T, int Arity = function_traits<T>::arity>
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struct load_item
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{
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static_assert(Arity==0 || Arity==1, "If a functions is passed to new_error or load, it must take zero or one argument");
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};
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template <class E>
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struct load_item<E, -1>
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{
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BOOST_LEAF_CONSTEXPR static int load_( int err_id, E && e ) noexcept
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{
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return load_slot<false>(err_id, std::forward<E>(e));
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}
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};
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template <class F>
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struct load_item<F, 0>
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{
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BOOST_LEAF_CONSTEXPR static int load_( int err_id, F && f ) noexcept
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{
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return load_slot_deferred<false>(err_id, std::forward<F>(f));
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}
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};
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template <class F>
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struct load_item<F, 1>
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{
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BOOST_LEAF_CONSTEXPR static int load_( int err_id, F && f ) noexcept
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{
|
|
return load_slot_accumulate<false>(err_id, std::forward<F>(f));
|
|
}
|
|
};
|
|
}
|
|
|
|
////////////////////////////////////////
|
|
|
|
namespace leaf_detail
|
|
{
|
|
struct BOOST_LEAF_SYMBOL_VISIBLE tls_tag_id_factory_current_id;
|
|
|
|
template <class=void>
|
|
struct BOOST_LEAF_SYMBOL_VISIBLE id_factory
|
|
{
|
|
static atomic_unsigned_int counter;
|
|
|
|
BOOST_LEAF_CONSTEXPR static unsigned generate_next_id() noexcept
|
|
{
|
|
auto id = (counter+=4);
|
|
BOOST_LEAF_ASSERT((id&3)==1);
|
|
return id;
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
atomic_unsigned_int id_factory<T>::counter(unsigned(-3));
|
|
|
|
inline int current_id() noexcept
|
|
{
|
|
unsigned id = tls::read_uint<tls_tag_id_factory_current_id>();
|
|
BOOST_LEAF_ASSERT(id==0 || (id&3)==1);
|
|
return int(id);
|
|
}
|
|
|
|
inline int new_id() noexcept
|
|
{
|
|
unsigned id = id_factory<>::generate_next_id();
|
|
tls::write_uint<tls_tag_id_factory_current_id>(id);
|
|
return int(id);
|
|
}
|
|
|
|
struct inject_loc
|
|
{
|
|
char const * const file;
|
|
int const line;
|
|
char const * const fn;
|
|
|
|
template <class T>
|
|
friend T operator+( inject_loc loc, T && x ) noexcept
|
|
{
|
|
x.load_source_location_(loc.file, loc.line, loc.fn);
|
|
return std::move(x);
|
|
}
|
|
};
|
|
}
|
|
|
|
#if BOOST_LEAF_CFG_STD_SYSTEM_ERROR
|
|
|
|
namespace leaf_detail
|
|
{
|
|
class leaf_category final: public std::error_category
|
|
{
|
|
bool equivalent( int, std::error_condition const & ) const noexcept final override { return false; }
|
|
bool equivalent( std::error_code const &, int ) const noexcept final override { return false; }
|
|
char const * name() const noexcept final override { return "LEAF error"; }
|
|
std::string message( int ) const final override { return name(); }
|
|
public:
|
|
~leaf_category() noexcept final override { }
|
|
};
|
|
|
|
template <class=void>
|
|
struct get_error_category
|
|
{
|
|
static leaf_category cat;
|
|
};
|
|
|
|
template <class T>
|
|
leaf_category get_error_category<T>::cat;
|
|
|
|
inline int import_error_code( std::error_code const & ec ) noexcept
|
|
{
|
|
if( int err_id = ec.value() )
|
|
{
|
|
std::error_category const & cat = get_error_category<>::cat;
|
|
if( &ec.category() == &cat )
|
|
{
|
|
BOOST_LEAF_ASSERT((err_id&3)==1);
|
|
return (err_id&~3)|1;
|
|
}
|
|
else
|
|
{
|
|
err_id = new_id();
|
|
(void) load_slot<false>(err_id, ec);
|
|
return (err_id&~3)|1;
|
|
}
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
inline bool is_error_id( std::error_code const & ec ) noexcept
|
|
{
|
|
bool res = (&ec.category() == &leaf_detail::get_error_category<>::cat);
|
|
BOOST_LEAF_ASSERT(!res || !ec.value() || ((ec.value()&3)==1));
|
|
return res;
|
|
}
|
|
|
|
#endif
|
|
|
|
////////////////////////////////////////
|
|
|
|
namespace leaf_detail
|
|
{
|
|
BOOST_LEAF_CONSTEXPR error_id make_error_id(int) noexcept;
|
|
}
|
|
|
|
class BOOST_LEAF_SYMBOL_VISIBLE error_id
|
|
{
|
|
friend error_id BOOST_LEAF_CONSTEXPR leaf_detail::make_error_id(int) noexcept;
|
|
|
|
int value_;
|
|
|
|
BOOST_LEAF_CONSTEXPR explicit error_id( int value ) noexcept:
|
|
value_(value)
|
|
{
|
|
BOOST_LEAF_ASSERT(value_==0 || ((value_&3)==1));
|
|
}
|
|
|
|
public:
|
|
|
|
BOOST_LEAF_CONSTEXPR error_id() noexcept:
|
|
value_(0)
|
|
{
|
|
}
|
|
|
|
#if BOOST_LEAF_CFG_STD_SYSTEM_ERROR
|
|
error_id( std::error_code const & ec ) noexcept:
|
|
value_(leaf_detail::import_error_code(ec))
|
|
{
|
|
BOOST_LEAF_ASSERT(!value_ || ((value_&3)==1));
|
|
}
|
|
|
|
template <class Enum>
|
|
error_id( Enum e, typename std::enable_if<std::is_error_code_enum<Enum>::value, Enum>::type * = 0 ) noexcept:
|
|
value_(leaf_detail::import_error_code(e))
|
|
{
|
|
}
|
|
|
|
operator std::error_code() const noexcept
|
|
{
|
|
return std::error_code(value_, leaf_detail::get_error_category<>::cat);
|
|
}
|
|
#endif
|
|
|
|
BOOST_LEAF_CONSTEXPR error_id load() const noexcept
|
|
{
|
|
return *this;
|
|
}
|
|
|
|
template <class Item>
|
|
BOOST_LEAF_CONSTEXPR error_id load(Item && item) const noexcept
|
|
{
|
|
if (int err_id = value())
|
|
{
|
|
int const unused[] = { 42, leaf_detail::load_item<Item>::load_(err_id, std::forward<Item>(item)) };
|
|
(void)unused;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
template <class... Item>
|
|
BOOST_LEAF_CONSTEXPR error_id load( Item && ... item ) const noexcept
|
|
{
|
|
if( int err_id = value() )
|
|
{
|
|
int const unused[] = { 42, leaf_detail::load_item<Item>::load_(err_id, std::forward<Item>(item))... };
|
|
(void) unused;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR int value() const noexcept
|
|
{
|
|
BOOST_LEAF_ASSERT(value_==0 || ((value_&3)==1));
|
|
return value_;
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR explicit operator bool() const noexcept
|
|
{
|
|
return value_ != 0;
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR friend bool operator==( error_id a, error_id b ) noexcept
|
|
{
|
|
return a.value_ == b.value_;
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR friend bool operator!=( error_id a, error_id b ) noexcept
|
|
{
|
|
return !(a == b);
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR friend bool operator<( error_id a, error_id b ) noexcept
|
|
{
|
|
return a.value_ < b.value_;
|
|
}
|
|
|
|
template <class CharT, class Traits>
|
|
friend std::ostream & operator<<( std::basic_ostream<CharT, Traits> & os, error_id x )
|
|
{
|
|
return os << x.value_;
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR void load_source_location_( char const * file, int line, char const * function ) const noexcept
|
|
{
|
|
BOOST_LEAF_ASSERT(file&&*file);
|
|
BOOST_LEAF_ASSERT(line>0);
|
|
BOOST_LEAF_ASSERT(function&&*function);
|
|
BOOST_LEAF_ASSERT(value_);
|
|
(void) load(e_source_location {file,line,function});
|
|
}
|
|
};
|
|
|
|
namespace leaf_detail
|
|
{
|
|
BOOST_LEAF_CONSTEXPR inline error_id make_error_id( int err_id ) noexcept
|
|
{
|
|
BOOST_LEAF_ASSERT(err_id==0 || (err_id&3)==1);
|
|
return error_id((err_id&~3)|1);
|
|
}
|
|
}
|
|
|
|
inline error_id new_error() noexcept
|
|
{
|
|
return leaf_detail::make_error_id(leaf_detail::new_id());
|
|
}
|
|
|
|
template <class... Item>
|
|
inline error_id new_error( Item && ... item ) noexcept
|
|
{
|
|
return leaf_detail::make_error_id(leaf_detail::new_id()).load(std::forward<Item>(item)...);
|
|
}
|
|
|
|
inline error_id current_error() noexcept
|
|
{
|
|
return leaf_detail::make_error_id(leaf_detail::current_id());
|
|
}
|
|
|
|
////////////////////////////////////////////
|
|
|
|
class polymorphic_context
|
|
{
|
|
};
|
|
|
|
#if BOOST_LEAF_CFG_CAPTURE
|
|
using context_ptr = std::shared_ptr<polymorphic_context>;
|
|
#endif
|
|
|
|
////////////////////////////////////////////
|
|
|
|
template <class Ctx>
|
|
class context_activator
|
|
{
|
|
context_activator( context_activator const & ) = delete;
|
|
context_activator & operator=( context_activator const & ) = delete;
|
|
|
|
Ctx * ctx_;
|
|
|
|
public:
|
|
|
|
explicit BOOST_LEAF_CONSTEXPR BOOST_LEAF_ALWAYS_INLINE context_activator(Ctx & ctx) noexcept:
|
|
ctx_(ctx.is_active() ? nullptr : &ctx)
|
|
{
|
|
if( ctx_ )
|
|
ctx_->activate();
|
|
}
|
|
|
|
BOOST_LEAF_CONSTEXPR BOOST_LEAF_ALWAYS_INLINE context_activator( context_activator && x ) noexcept:
|
|
ctx_(x.ctx_)
|
|
{
|
|
x.ctx_ = nullptr;
|
|
}
|
|
|
|
BOOST_LEAF_ALWAYS_INLINE ~context_activator() noexcept
|
|
{
|
|
if( ctx_ && ctx_->is_active() )
|
|
ctx_->deactivate();
|
|
}
|
|
};
|
|
|
|
////////////////////////////////////////////
|
|
|
|
template <class R>
|
|
struct is_result_type: std::false_type
|
|
{
|
|
};
|
|
|
|
template <class R>
|
|
struct is_result_type<R const>: is_result_type<R>
|
|
{
|
|
};
|
|
|
|
} }
|
|
|
|
#endif
|