added leaf headers (615c6dbb) · Commits · David Auer / gekkofs

external/leaf/all.hpp

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external/leaf/capture.hpp

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		#ifndef BOOST_LEAF_CAPTURE_HPP_INCLUDED
		#define BOOST_LEAF_CAPTURE_HPP_INCLUDED

		// Copyright (c) 2018-2020 Emil Dotchevski and Reverge Studios, Inc.

		// 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_LEAF_ENABLE_WARNINGS
		# if defined(__clang__)
		# pragma clang system_header
		# elif (__GNUC__*100+__GNUC_MINOR__>301)
		# pragma GCC system_header
		# elif defined(_MSC_VER)
		# pragma warning(push,1)
		# endif
		#endif

		#include "exception.hpp"
		#include "on_error.hpp"
		#include "../../../../../../usr/include/c++/8/memory"

		namespace boost { namespace leaf {

		namespace leaf_detail
		{
		template <class R, bool IsResult = is_result_type<R>::value>
		struct is_result_tag;

		template <class R>
		struct is_result_tag<R, false>
		{
		};

		template <class R>
		struct is_result_tag<R, true>
		{
		};
		}

		#ifdef BOOST_LEAF_NO_EXCEPTIONS

		namespace leaf_detail
		{
		template <class R, class F, class... A>
		inline
		decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))
		capture_impl(is_result_tag<R, false>, context_ptr && ctx, F && f, A... a) noexcept
		{
		auto active_context = activate_context(*ctx);
		return std::forward<F>(f)(std::forward<A>(a)...);
		}

		template <class R, class F, class... A>
		inline
		decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))
		capture_impl(is_result_tag<R, true>, context_ptr && ctx, F && f, A... a) noexcept
		{
		auto active_context = activate_context(*ctx);
		if( auto r = std::forward<F>(f)(std::forward<A>(a)...) )
		return r;
		else
		{
		ctx->captured_id_ = r.error();
		return std::move(ctx);
		}
		}

		template <class R, class Future>
		inline
		decltype(std::declval<Future>().get())
		future_get_impl(is_result_tag<R, false>, Future & fut) noexcept
		{
		return fut.get();
		}

		template <class R, class Future>
		inline
		decltype(std::declval<Future>().get())
		future_get_impl(is_result_tag<R, true>, Future & fut) noexcept
		{
		if( auto r = fut.get() )
		return r;
		else
		return error_id(r.error()); // unloads
		}
		}

		#else

		namespace leaf_detail
		{
		class capturing_exception:
		public std::exception
		{
		std::exception_ptr ex_;
		context_ptr ctx_;

		public:

		capturing_exception(std::exception_ptr && ex, context_ptr && ctx) noexcept:
		ex_(std::move(ex)),
		ctx_(std::move(ctx))
		{
		BOOST_LEAF_ASSERT(ex_);
		BOOST_LEAF_ASSERT(ctx_);
		BOOST_LEAF_ASSERT(ctx_->captured_id_);
		}

		[[noreturn]] void unload_and_rethrow_original_exception() const
		{
		BOOST_LEAF_ASSERT(ctx_->captured_id_);
		auto active_context = activate_context(*ctx_);
		id_factory<>::current_id = ctx_->captured_id_.value();
		std::rethrow_exception(ex_);
		}

		void print( std::ostream & os ) const
		{
		ctx_->print(os);
		}
		};

		template <class R, class F, class... A>
		inline
		decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))
		capture_impl(is_result_tag<R, false>, context_ptr && ctx, F && f, A... a)
		{
		auto active_context = activate_context(*ctx);
		error_monitor cur_err;
		try
		{
		return std::forward<F>(f)(std::forward<A>(a)...);
		}
		catch( capturing_exception const & )
		{
		throw;
		}
		catch( exception_base const & e )
		{
		ctx->captured_id_ = e.get_error_id();
		throw_exception( capturing_exception(std::current_exception(), std::move(ctx)) );
		}
		catch(...)
		{
		ctx->captured_id_ = cur_err.assigned_error_id();
		throw_exception( capturing_exception(std::current_exception(), std::move(ctx)) );
		}
		}

		template <class R, class F, class... A>
		inline
		decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))
		capture_impl(is_result_tag<R, true>, context_ptr && ctx, F && f, A... a)
		{
		auto active_context = activate_context(*ctx);
		error_monitor cur_err;
		try
		{
		if( auto && r = std::forward<F>(f)(std::forward<A>(a)...) )
		return std::move(r);
		else
		{
		ctx->captured_id_ = r.error();
		return std::move(ctx);
		}
		}
		catch( capturing_exception const & )
		{
		throw;
		}
		catch( exception_base const & e )
		{
		ctx->captured_id_ = e.get_error_id();
		throw_exception( capturing_exception(std::current_exception(), std::move(ctx)) );
		}
		catch(...)
		{
		ctx->captured_id_ = cur_err.assigned_error_id();
		throw_exception( capturing_exception(std::current_exception(), std::move(ctx)) );
		}
		}

		template <class R, class Future>
		inline
		decltype(std::declval<Future>().get())
		future_get_impl(is_result_tag<R, false>, Future & fut )
		{
		try
		{
		return fut.get();
		}
		catch( capturing_exception const & cap )
		{
		cap.unload_and_rethrow_original_exception();
		}
		}

		template <class R, class Future>
		inline
		decltype(std::declval<Future>().get())
		future_get_impl(is_result_tag<R, true>, Future & fut )
		{
		try
		{
		if( auto r = fut.get() )
		return r;
		else
		return error_id(r.error()); // unloads
		}
		catch( capturing_exception const & cap )
		{
		cap.unload_and_rethrow_original_exception();
		}
		}
		}

		#endif

		template <class F, class... A>
		inline
		decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))
		capture(context_ptr && ctx, F && f, A... a)
		{
		using namespace leaf_detail;
		return capture_impl(is_result_tag<decltype(std::declval<F>()(std::forward<A>(std::declval<A>())...))>(), std::move(ctx), std::forward<F>(f), std::forward<A>(a)...);
		}

		template <class Future>
		inline
		decltype(std::declval<Future>().get())
		future_get( Future & fut )
		{
		using namespace leaf_detail;
		return future_get_impl(is_result_tag<decltype(std::declval<Future>().get())>(), fut);
		}

		////////////////////////////////////////

		#ifndef BOOST_LEAF_NO_EXCEPTIONS

		template <class T>
		class result;

		namespace leaf_detail
		{
		inline error_id catch_exceptions_helper( std::exception const & ex, leaf_detail_mp11::mp_list<> )
		{
		return leaf::new_error(std::current_exception());
		}

		template <class Ex1, class... Ex>
		inline error_id catch_exceptions_helper( std::exception const & ex, leaf_detail_mp11::mp_list<Ex1,Ex...> )
		{
		if( Ex1 const * p = dynamic_cast<Ex1 const *>(&ex) )
		return catch_exceptions_helper(ex, leaf_detail_mp11::mp_list<Ex...>{ }).load(*p);
		else
		return catch_exceptions_helper(ex, leaf_detail_mp11::mp_list<Ex...>{ });
		}

		template <class T>
		struct deduce_exception_to_result_return_type_impl
		{
		using type = result<T>;
		};

		template <class T>
		struct deduce_exception_to_result_return_type_impl<result<T>>
		{
		using type = result<T>;
		};

		template <class T>
		using deduce_exception_to_result_return_type = typename deduce_exception_to_result_return_type_impl<T>::type;
		}

		template <class... Ex, class F>
		inline
		leaf_detail::deduce_exception_to_result_return_type<leaf_detail::fn_return_type<F>>
		exception_to_result( F && f ) noexcept
		{
		try
		{
		return std::forward<F>(f)();
		}
		catch( std::exception const & ex )
		{
		return leaf_detail::catch_exceptions_helper(ex, leaf_detail_mp11::mp_list<Ex...>());
		}
		catch(...)
		{
		return leaf::new_error(std::current_exception());
		}
		}

		#endif

		} }

		#endif

external/leaf/common.hpp

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		#ifndef BOOST_LEAF_COMMON_HPP_INCLUDED
		#define BOOST_LEAF_COMMON_HPP_INCLUDED

		// Copyright (c) 2018-2020 Emil Dotchevski and Reverge Studios, Inc.

		// 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_LEAF_ENABLE_WARNINGS
		# if defined(__clang__)
		# pragma clang system_header
		# elif (__GNUC__*100+__GNUC_MINOR__>301)
		# pragma GCC system_header
		# elif defined(_MSC_VER)
		# pragma warning(push,1)
		# endif
		#endif

		#include "detail/print.hpp"
		#include "../../../../../../usr/include/c++/8/string"
		#include "../../../../../../usr/include/c++/8/cerrno"
		#ifdef _WIN32
		# include <Windows.h>
		# include <cstring>
		#ifdef min
		# undef min
		#endif
		#ifdef max
		# undef max
		#endif
		#endif

		namespace boost { namespace leaf {

		struct e_api_function { char const * value; };

		struct e_file_name { std::string value; };

		struct e_errno
		{
		int value;

		friend std::ostream & operator<<( std::ostream & os, e_errno const & err )
		{
		return os << type<e_errno>() << ": " << err.value << ", \"" << std::strerror(err.value) << '"';
		}
		};

		struct e_type_info_name { char const * value; };

		struct e_at_line { int value; };

		namespace windows
		{
		struct e_LastError
		{
		unsigned value;

		#ifdef _WIN32
		friend std::ostream & operator<<( std::ostream & os, e_LastError const & err )
		{
		struct msg_buf
		{
		LPVOID * p;
		msg_buf(): p(0) { }
		~msg_buf() noexcept { if(p) LocalFree(p); }
		};
		msg_buf mb;
		if( FormatMessageA(
		FORMAT_MESSAGE_ALLOCATE_BUFFER\|FORMAT_MESSAGE_FROM_SYSTEM\|FORMAT_MESSAGE_IGNORE_INSERTS,
		0,
		err.value,
		MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),
		(LPSTR)&mb.p,
		0,
		0) )
		{
		BOOST_LEAF_ASSERT(mb.p != 0);
		char * z = std::strchr((LPSTR)mb.p,0);
		if( z[-1] == '\n' )
		*--z = 0;
		if( z[-1] == '\r' )
		*--z = 0;
		return os << type<e_LastError>() << ": " << err.value << ", \"" << (LPCSTR)mb.p << '"';
		}
		return os;
		}
		#else
		// TODO : Other platforms
		#endif
		};
		}

		} }

		#endif

external/leaf/context.hpp

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		#ifndef BOOST_LEAF_CONTEXT_HPP_INCLUDED
		#define BOOST_LEAF_CONTEXT_HPP_INCLUDED

		// Copyright (c) 2018-2020 Emil Dotchevski and Reverge Studios, Inc.

		// 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_LEAF_ENABLE_WARNINGS
		# if defined(__clang__)
		# pragma clang system_header
		# elif (__GNUC__*100+__GNUC_MINOR__>301)
		# pragma GCC system_header
		# elif defined(_MSC_VER)
		# pragma warning(push,1)
		# endif
		#endif

		#include "error.hpp"

		namespace boost { namespace leaf {

		class error_info;
		class diagnostic_info;
		class verbose_diagnostic_info;

		template <class>
		struct is_predicate: std::false_type
		{
		};

		namespace leaf_detail
		{
		template <class T>
		struct is_exception: std::is_base_of<std::exception, typename std::decay<T>::type>
		{
		};

		template <class E>
		struct handler_argument_traits;

		template <class E, bool IsPredicate = is_predicate<E>::value>
		struct handler_argument_traits_defaults;

		template <class E>
		struct handler_argument_traits_defaults<E, false>
		{
		using error_type = typename std::decay<E>::type;
		constexpr static bool always_available = false;

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static error_type const * check( Tup const &, error_info const & ) noexcept;

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static error_type * check( Tup &, error_info const & ) noexcept;

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static E get( Tup & tup, error_info const & ei ) noexcept
		{
		return *check(tup, ei);
		}

		static_assert(!is_predicate<error_type>::value, "Handlers must take predicate arguments by value");
		static_assert(!std::is_same<E, error_info>::value, "Handlers must take leaf::error_info arguments by const &");
		static_assert(!std::is_same<E, diagnostic_info>::value, "Handlers must take leaf::diagnostic_info arguments by const &");
		static_assert(!std::is_same<E, verbose_diagnostic_info>::value, "Handlers must take leaf::verbose_diagnostic_info arguments by const &");
		};

		template <class Pred>
		struct handler_argument_traits_defaults<Pred, true>: handler_argument_traits<typename Pred::error_type>
		{
		using base = handler_argument_traits<typename Pred::error_type>;
		static_assert(!base::always_available, "Predicates can't use types that are always_available");

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static bool check( Tup & tup, error_info const & ei ) noexcept
		{
		auto e = base::check(tup, ei);
		return e && Pred::evaluate(*e);
		};

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static Pred get( Tup const & tup, error_info const & ei ) noexcept
		{
		return Pred{*base::check(tup, ei)};
		}
		};

		template <class E>
		struct handler_argument_always_available
		{
		using error_type = E;
		constexpr static bool always_available = true;

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static bool check( Tup &, error_info const & ) noexcept
		{
		return true;
		};
		};

		template <class E>
		struct handler_argument_traits: handler_argument_traits_defaults<E>
		{
		};

		template <>
		struct handler_argument_traits<void>
		{
		using error_type = void;
		constexpr static bool always_available = false;

		template <class Tup>
		BOOST_LEAF_CONSTEXPR static std::exception const * check( Tup const &, error_info const & ) noexcept;
		};

		template <class E>
		struct handler_argument_traits<E &&>
		{
		static_assert(sizeof(E) == 0, "Error handlers may not take rvalue ref arguments");
		};

		template <class E>
		struct handler_argument_traits<E *>: handler_argument_always_available<typename std::remove_const<E>::type>
		{
		template <class Tup>
		BOOST_LEAF_CONSTEXPR static E * get( Tup & tup, error_info const & ei) noexcept
		{
		return handler_argument_traits_defaults<E>::check(tup, ei);
		}
		};

		template <>
		struct handler_argument_traits<error_info const &>: handler_argument_always_available<void>
		{
		template <class Tup>
		BOOST_LEAF_CONSTEXPR static error_info const & get( Tup const &, error_info const & ei ) noexcept
		{
		return ei;
		}
		};

		template <class E>
		struct handler_argument_traits_require_by_value
		{
		static_assert(sizeof(E) == 0, "Error handlers must take this type by value");
		};
		}

		////////////////////////////////////////

		namespace leaf_detail
		{
		template <int I, class Tuple>
		struct tuple_for_each
		{
		BOOST_LEAF_CONSTEXPR static void activate( Tuple & tup ) noexcept
		{
		static_assert(!std::is_same<error_info, typename std::decay<decltype(std::get<I-1>(tup))>::type>::value, "Bug in LEAF: context type deduction");
		tuple_for_each<I-1,Tuple>::activate(tup);
		std::get<I-1>(tup).activate();
		}

		BOOST_LEAF_CONSTEXPR static void deactivate( Tuple & tup ) noexcept
		{
		static_assert(!std::is_same<error_info, typename std::decay<decltype(std::get<I-1>(tup))>::type>::value, "Bug in LEAF: context type deduction");
		std::get<I-1>(tup).deactivate();
		tuple_for_each<I-1,Tuple>::deactivate(tup);
		}

		BOOST_LEAF_CONSTEXPR static void propagate( Tuple & tup ) noexcept
		{
		static_assert(!std::is_same<error_info, typename std::decay<decltype(std::get<I-1>(tup))>::type>::value, "Bug in LEAF: context type deduction");
		auto & sl = std::get<I-1>(tup);
		sl.propagate();
		tuple_for_each<I-1,Tuple>::propagate(tup);
		}

		BOOST_LEAF_CONSTEXPR static void propagate_captured( Tuple & tup, int err_id ) noexcept
		{
		static_assert(!std::is_same<error_info, typename std::decay<decltype(std::get<I-1>(tup))>::type>::value, "Bug in LEAF: context type deduction");
		auto & sl = std::get<I-1>(tup);
		if( sl.has_value(err_id) )
		load_slot(err_id, std::move(sl).value(err_id));
		tuple_for_each<I-1,Tuple>::propagate_captured(tup, err_id);
		}

		static void print( std::ostream & os, void const * tup, int key_to_print )
		{
		BOOST_LEAF_ASSERT(tup != 0);
		tuple_for_each<I-1,Tuple>::print(os, tup, key_to_print);
		std::get<I-1>(static_cast<Tuple const >(tup)).print(os, key_to_print);
		}
		};

		template <class Tuple>
		struct tuple_for_each<0, Tuple>
		{
		BOOST_LEAF_CONSTEXPR static void activate( Tuple & ) noexcept { }
		BOOST_LEAF_CONSTEXPR static void deactivate( Tuple & ) noexcept { }
		BOOST_LEAF_CONSTEXPR static void propagate( Tuple & tup ) noexcept { }
		BOOST_LEAF_CONSTEXPR static void propagate_captured( Tuple & tup, int ) noexcept { }
		static void print( std::ostream &, void const *, int ) { }
		};
		}

		////////////////////////////////////////////

		#if BOOST_LEAF_DIAGNOSTICS

		namespace leaf_detail
		{
		template <class T> struct requires_unexpected { constexpr static bool value = false; };
		template <class T> struct requires_unexpected<T const> { constexpr static bool value = requires_unexpected<T>::value; };
		template <class T> struct requires_unexpected<T const &> { constexpr static bool value = requires_unexpected<T>::value; };
		template <class T> struct requires_unexpected<T const *> { constexpr static bool value = requires_unexpected<T>::value; };
		template <> struct requires_unexpected<e_unexpected_count> { constexpr static bool value = true; };
		template <> struct requires_unexpected<e_unexpected_info> { constexpr static bool value = true; };

		template <class L>
		struct unexpected_requested;

		template <template <class ...> class L>
		struct unexpected_requested<L<>>
		{
		constexpr static bool value = false;
		};

		template <template <class...> class L, template <class> class S, class Car, class... Cdr>
		struct unexpected_requested<L<S<Car>, S<Cdr>...>>
		{
		constexpr static bool value = requires_unexpected<Car>::value \|\| unexpected_requested<L<S<Cdr>...>>::value;
		};
		}

		#endif

		////////////////////////////////////////////

		namespace leaf_detail
		{
		template <class T> struct does_not_participate_in_context_deduction: std::false_type { };
		template <> struct does_not_participate_in_context_deduction<void>: std::true_type { };

		template <class L>
		struct deduce_e_type_list;

		template <template<class...> class L, class... T>
		struct deduce_e_type_list<L<T...>>
		{
		using type =
		leaf_detail_mp11::mp_remove_if<
		leaf_detail_mp11::mp_unique<
		leaf_detail_mp11::mp_list<typename handler_argument_traits<T>::error_type...>
		>,
		does_not_participate_in_context_deduction
		>;
		};

		template <class L>
		struct deduce_e_tuple_impl;

		template <template <class...> class L, class... E>
		struct deduce_e_tuple_impl<L<E...>>
		{
		using type = std::tuple<slot<E>...>;
		};

		template <class... E>
		using deduce_e_tuple = typename deduce_e_tuple_impl<typename deduce_e_type_list<leaf_detail_mp11::mp_list<E...>>::type>::type;
		}

		////////////////////////////////////////////

		template <class... E>
		class context
		{
		context( context const & ) = delete;
		context & operator=( context const & ) = delete;

		using Tup = leaf_detail::deduce_e_tuple<E...>;
		Tup tup_;

		#if !defined(BOOST_LEAF_NO_THREADS) && !defined(NDEBUG)
		std::thread::id thread_id_;
		#endif
		bool is_active_;

		protected:

		BOOST_LEAF_CONSTEXPR error_id propagate_captured_errors( error_id err_id ) noexcept
		{
		leaf_detail::tuple_for_each<std::tuple_size<Tup>::value,Tup>::propagate_captured(tup_, err_id.value());
		return err_id;
		}

		public:

		BOOST_LEAF_CONSTEXPR context( context && x ) noexcept:
		tup_(std::move(x.tup_)),
		is_active_(false)
		{
		BOOST_LEAF_ASSERT(!x.is_active());
		}

		BOOST_LEAF_CONSTEXPR context() noexcept:
		is_active_(false)
		{
		}

		~context() noexcept
		{
		BOOST_LEAF_ASSERT(!is_active());
		}

		BOOST_LEAF_CONSTEXPR Tup const & tup() const noexcept
		{
		return tup_;
		}

		BOOST_LEAF_CONSTEXPR Tup & tup() noexcept
		{
		return tup_;
		}

		BOOST_LEAF_CONSTEXPR void activate() noexcept
		{
		using namespace leaf_detail;
		BOOST_LEAF_ASSERT(!is_active());
		tuple_for_each<std::tuple_size<Tup>::value,Tup>::activate(tup_);
		#if BOOST_LEAF_DIAGNOSTICS
		if( unexpected_requested<Tup>::value )
		++tl_unexpected_enabled<>::counter;
		#endif
		#if !defined(BOOST_LEAF_NO_THREADS) && !defined(NDEBUG)
		thread_id_ = std::this_thread::get_id();
		#endif
		is_active_ = true;
		}

		BOOST_LEAF_CONSTEXPR void deactivate() noexcept
		{
		using namespace leaf_detail;
		BOOST_LEAF_ASSERT(is_active());
		is_active_ = false;
		#if !defined(BOOST_LEAF_NO_THREADS) && !defined(NDEBUG)
		BOOST_LEAF_ASSERT(std::this_thread::get_id() == thread_id_);
		thread_id_ = std::thread::id();
		#endif
		#if BOOST_LEAF_DIAGNOSTICS
		if( unexpected_requested<Tup>::value )
		--tl_unexpected_enabled<>::counter;
		#endif
		tuple_for_each<std::tuple_size<Tup>::value,Tup>::deactivate(tup_);
		}

		BOOST_LEAF_CONSTEXPR void propagate() noexcept
		{
		leaf_detail::tuple_for_each<std::tuple_size<Tup>::value,Tup>::propagate(tup_);
		}

		BOOST_LEAF_CONSTEXPR bool is_active() const noexcept
		{
		return is_active_;
		}

		void print( std::ostream & os ) const
		{
		leaf_detail::tuple_for_each<std::tuple_size<Tup>::value,Tup>::print(os, &tup_, 0);
		}

		template <class R, class... H>
		BOOST_LEAF_CONSTEXPR R handle_error( error_id, H && ... ) const;

		template <class R, class... H>
		BOOST_LEAF_CONSTEXPR R handle_error( error_id, H && ... );
		};

		////////////////////////////////////////

		namespace leaf_detail
		{
		template <class TypeList>
		struct deduce_context_impl;

		template <template <class...> class L, class... E>
		struct deduce_context_impl<L<E...>>
		{
		using type = context<E...>;
		};

		template <class TypeList>
		using deduce_context = typename deduce_context_impl<TypeList>::type;

		template <class H>
		struct fn_mp_args_fwd
		{
		using type = fn_mp_args<H>;
		};

		template <class... H>
		struct fn_mp_args_fwd<std::tuple<H...> &>: fn_mp_args_fwd<std::tuple<H...>> { };

		template <class... H>
		struct fn_mp_args_fwd<std::tuple<H...>>
		{
		using type = leaf_detail_mp11::mp_append<typename fn_mp_args_fwd<H>::type...>;
		};

		template <class... H>
		struct context_type_from_handlers_impl
		{
		using type = deduce_context<leaf_detail_mp11::mp_append<typename fn_mp_args_fwd<H>::type...>>;
		};

		template <class Ctx>
		struct polymorphic_context_impl: polymorphic_context, Ctx
		{
		error_id propagate_captured_errors() noexcept final override { return Ctx::propagate_captured_errors(captured_id_); }
		void activate() noexcept final override { Ctx::activate(); }
		void deactivate() noexcept final override { Ctx::deactivate(); }
		void propagate() noexcept final override { Ctx::propagate(); }
		bool is_active() const noexcept final override { return Ctx::is_active(); }
		void print( std::ostream & os ) const final override { return Ctx::print(os); }
		};
		}

		template <class... H>
		using context_type_from_handlers = typename leaf_detail::context_type_from_handlers_impl<H...>::type;

		////////////////////////////////////////////

		template <class... H>
		BOOST_LEAF_CONSTEXPR inline context_type_from_handlers<H...> make_context() noexcept
		{
		return { };
		}

		template <class... H>
		BOOST_LEAF_CONSTEXPR inline context_type_from_handlers<H...> make_context( H && ... ) noexcept
		{
		return { };
		}

		////////////////////////////////////////////

		template <class... H>
		inline context_ptr make_shared_context() noexcept
		{
		return std::make_shared<leaf_detail::polymorphic_context_impl<context_type_from_handlers<H...>>>();
		}

		template <class... H>
		inline context_ptr make_shared_context( H && ... ) noexcept
		{
		return std::make_shared<leaf_detail::polymorphic_context_impl<context_type_from_handlers<H...>>>();
		}

		} }

		#endif

external/leaf/detail/all.hpp

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+19 −0

Original line number	Diff line number	Diff line
		#ifndef BOOST_LEAF_ALL_HPP_INCLUDED
		#define BOOST_LEAF_ALL_HPP_INCLUDED

		// Copyright (c) 2018-2020 Emil Dotchevski and Reverge Studios, Inc.

		// 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)

		#include <boost/leaf/capture.hpp>
		#include <boost/leaf/common.hpp>
		#include <boost/leaf/context.hpp>
		#include <boost/leaf/error.hpp>
		#include <boost/leaf/exception.hpp>
		#include <boost/leaf/handle_errors.hpp>
		#include <boost/leaf/on_error.hpp>
		#include <boost/leaf/pred.hpp>
		#include <boost/leaf/result.hpp>

		#endif