Added thirdparty: boost library

thirdparty/include/boost/leaf/exception.hpp

@@ -0,0 +1,283 @@
+#ifndef BOOST_LEAF_EXCEPTION_HPP_INCLUDED
+#define BOOST_LEAF_EXCEPTION_HPP_INCLUDED
+
+// Copyright 2018-2023 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/config.hpp>
+#include <boost/leaf/error.hpp>
+#include <exception>
+
+#ifdef BOOST_LEAF_NO_EXCEPTIONS
+
+namespace boost
+{
+    [[noreturn]] void throw_exception( std::exception const & ); // user defined
+}
+
+namespace boost { namespace leaf {
+
+namespace leaf_detail
+{
+    template <class T>
+    [[noreturn]] void throw_exception_impl( T && e )
+    {
+        ::boost::throw_exception(std::move(e));
+    }
+
+    class BOOST_LEAF_SYMBOL_VISIBLE exception_base
+    {
+    public:
+
+        virtual error_id get_error_id() const noexcept = 0;
+
+    protected:
+
+        exception_base() noexcept { }
+        ~exception_base() noexcept { }
+    };
+}
+
+} }
+
+#else
+
+#include <memory>
+
+namespace boost { namespace leaf {
+
+namespace leaf_detail
+{
+    template <class T>
+    [[noreturn]] void throw_exception_impl( T && e )
+    {
+        throw std::move(e);
+    }
+
+    class BOOST_LEAF_SYMBOL_VISIBLE exception_base
+    {
+        std::shared_ptr<void const> auto_id_bump_;
+
+    public:
+
+        virtual error_id get_error_id() const noexcept = 0;
+
+    protected:
+
+        exception_base():
+            auto_id_bump_(nullptr, [](void const *) { (void) new_id(); })
+        {
+        }
+
+        ~exception_base() noexcept { }
+    };
+}
+
+} }
+
+#endif
+
+////////////////////////////////////////
+
+#define BOOST_LEAF_THROW_EXCEPTION ::boost::leaf::leaf_detail::throw_with_loc{__FILE__,__LINE__,__FUNCTION__}+::boost::leaf::leaf_detail::make_exception
+
+namespace boost { namespace leaf {
+
+namespace leaf_detail
+{
+    struct throw_with_loc
+    {
+        char const * const file;
+        int const line;
+        char const * const fn;
+
+        template <class Ex>
+        [[noreturn]] friend void operator+( throw_with_loc loc, Ex && ex )
+        {
+            ex.load_source_location_(loc.file, loc.line, loc.fn);
+            ::boost::leaf::leaf_detail::throw_exception_impl(std::move(ex));
+        }
+    };
+}
+
+} }
+
+////////////////////////////////////////
+
+namespace boost { namespace leaf {
+
+namespace leaf_detail
+{
+    inline void enforce_std_exception( std::exception const & ) noexcept { }
+
+    template <class Ex>
+    class BOOST_LEAF_SYMBOL_VISIBLE exception:
+        public Ex,
+        public exception_base,
+        public error_id
+    {
+        error_id get_error_id() const noexcept final override
+        {
+            return *this;
+        }
+
+    public:
+
+        exception( exception const & ) = default;
+        exception( exception && ) = default;
+
+        BOOST_LEAF_CONSTEXPR exception( error_id id, Ex const & ex ) noexcept:
+            Ex(ex),
+            error_id(id)
+        {
+            enforce_std_exception(*this);
+        }
+
+        BOOST_LEAF_CONSTEXPR exception( error_id id, Ex && ex ) noexcept:
+            Ex(std::move(ex)),
+            error_id(id)
+        {
+            enforce_std_exception(*this);
+        }
+
+        explicit BOOST_LEAF_CONSTEXPR exception( error_id id ) noexcept:
+            error_id(id)
+        {
+            enforce_std_exception(*this);
+        }
+    };
+
+    template <class... T>
+    struct at_least_one_derives_from_std_exception;
+
+    template <>
+    struct at_least_one_derives_from_std_exception<>: std::false_type { };
+
+    template <class T, class... Rest>
+    struct at_least_one_derives_from_std_exception<T, Rest...>
+    {
+        constexpr static const bool value = std::is_base_of<std::exception,typename std::remove_reference<T>::type>::value || at_least_one_derives_from_std_exception<Rest...>::value;
+    };
+
+    template <class Ex, class... E>
+    inline
+    typename std::enable_if<std::is_base_of<std::exception,typename std::remove_reference<Ex>::type>::value, exception<typename std::remove_reference<Ex>::type>>::type
+    make_exception( error_id err, Ex && ex, E && ... e ) noexcept
+    {
+        static_assert(!at_least_one_derives_from_std_exception<E...>::value, "Error objects passed to leaf::exception may not derive from std::exception");
+        return exception<typename std::remove_reference<Ex>::type>( err.load(std::forward<E>(e)...), std::forward<Ex>(ex) );
+    }
+
+    template <class E1, class... E>
+    inline
+    typename std::enable_if<!std::is_base_of<std::exception,typename std::remove_reference<E1>::type>::value, exception<std::exception>>::type
+    make_exception( error_id err, E1 && car, E && ... cdr ) noexcept
+    {
+        static_assert(!at_least_one_derives_from_std_exception<E...>::value, "Error objects passed to leaf::exception may not derive from std::exception");
+        return exception<std::exception>( err.load(std::forward<E1>(car), std::forward<E>(cdr)...) );
+    }
+
+    inline exception<std::exception> make_exception( error_id err ) noexcept
+    {
+        return exception<std::exception>(err);
+    }
+
+    template <class Ex, class... E>
+    inline
+    typename std::enable_if<std::is_base_of<std::exception,typename std::remove_reference<Ex>::type>::value, exception<typename std::remove_reference<Ex>::type>>::type
+    make_exception( Ex && ex, E && ... e ) noexcept
+    {
+        static_assert(!at_least_one_derives_from_std_exception<E...>::value, "Error objects passed to leaf::exception may not derive from std::exception");
+        return exception<typename std::remove_reference<Ex>::type>( new_error().load(std::forward<E>(e)...), std::forward<Ex>(ex) );
+    }
+
+    template <class E1, class... E>
+    inline
+    typename std::enable_if<!std::is_base_of<std::exception,typename std::remove_reference<E1>::type>::value, exception<std::exception>>::type
+    make_exception( E1 && car, E && ... cdr ) noexcept
+    {
+        static_assert(!at_least_one_derives_from_std_exception<E...>::value, "Error objects passed to leaf::exception may not derive from std::exception");
+        return exception<std::exception>( new_error().load(std::forward<E1>(car), std::forward<E>(cdr)...) );
+    }
+
+    inline exception<std::exception> make_exception() noexcept
+    {
+        return exception<std::exception>(leaf::new_error());
+    }
+}
+
+template <class... E>
+[[noreturn]] void throw_exception( E && ... e )
+{
+    // Warning: setting a breakpoint here will not intercept exceptions thrown
+    // via BOOST_LEAF_THROW_EXCEPTION or originating in the few other throw
+    // points elsewhere in LEAF. To intercept all of those exceptions as well,
+    // set a breakpoint inside boost::leaf::leaf_detail::throw_exception_impl.
+    leaf_detail::throw_exception_impl(leaf_detail::make_exception(std::forward<E>(e)...));
+}
+
+////////////////////////////////////////
+
+#ifndef BOOST_LEAF_NO_EXCEPTIONS
+
+template <class T>
+class result;
+
+namespace leaf_detail
+{
+    inline error_id catch_exceptions_helper( std::exception const &, 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