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 Hu Chunming
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#ifndef BOOST_LEAF_EXCEPTION_HPP_INCLUDED
#define BOOST_LEAF_EXCEPTION_HPP_INCLUDED
// Copyright 2018-2022 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
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