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|
// -*- C++ -*-
//===-------------------------- exception ---------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_EXCEPTION
#define _LIBCPP_EXCEPTION
/*
exception synopsis
namespace std
{
class exception
{
public:
exception() throw();
exception(const exception&) throw();
exception& operator=(const exception&) throw();
virtual ~exception() throw();
virtual const char* what() const throw();
};
class bad_exception
: public exception
{
public:
bad_exception() throw();
bad_exception(const bad_exception&) throw();
bad_exception& operator=(const bad_exception&) throw();
virtual ~bad_exception() throw();
virtual const char* what() const throw();
};
typedef void (*unexpected_handler)();
unexpected_handler set_unexpected(unexpected_handler f ) throw();
void unexpected [[noreturn]] ();
typedef void (*terminate_handler)();
terminate_handler set_terminate(terminate_handler f ) throw();
void terminate [[noreturn]] ();
bool uncaught_exception() throw();
typedef unspecified exception_ptr;
exception_ptr current_exception();
void rethrow_exception [[noreturn]] (exception_ptr p);
template<class E> exception_ptr make_exception_ptr(E e);
class nested_exception
{
public:
nested_exception() throw();
nested_exception(const nested_exception&) throw() = default;
nested_exception& operator=(const nested_exception&) throw() = default;
virtual ~nested_exception() = default;
// access functions
void rethrow_nested [[noreturn]] () const;
exception_ptr nested_ptr() const;
};
template <class T> void throw_with_nested [[noreturn]] (T&& t);
template <class E> void rethrow_if_nested(const E& e);
} // std
*/
#include <__config>
#include <cstddef>
#include <type_traits>
#pragma GCC system_header
namespace std // purposefully not using versioning namespace
{
class _LIBCPP_EXCEPTION_ABI exception
{
public:
_LIBCPP_INLINE_VISIBILITY exception() throw() {}
virtual ~exception() throw();
virtual const char* what() const throw();
};
class _LIBCPP_EXCEPTION_ABI bad_exception
: public exception
{
public:
_LIBCPP_INLINE_VISIBILITY bad_exception() throw() {}
virtual ~bad_exception() throw();
virtual const char* what() const throw();
};
typedef void (*unexpected_handler)();
_LIBCPP_VISIBLE unexpected_handler set_unexpected(unexpected_handler) throw();
_LIBCPP_VISIBLE void unexpected();
typedef void (*terminate_handler)();
_LIBCPP_VISIBLE terminate_handler set_terminate(terminate_handler) throw();
_LIBCPP_VISIBLE void terminate() __attribute__((__noreturn__));
_LIBCPP_VISIBLE bool uncaught_exception() throw();
class exception_ptr;
exception_ptr current_exception();
void rethrow_exception(exception_ptr); // noreturn
class exception_ptr
{
void* __ptr_;
public:
exception_ptr() : __ptr_() {}
exception_ptr(nullptr_t) : __ptr_() {}
exception_ptr(const exception_ptr&);
exception_ptr& operator=(const exception_ptr&);
~exception_ptr();
// explicit
operator bool() const {return __ptr_ != nullptr;}
friend bool operator==(const exception_ptr& __x, const exception_ptr& __y)
{return __x.__ptr_ == __y.__ptr_;}
friend bool operator!=(const exception_ptr& __x, const exception_ptr& __y)
{return !(__x == __y);}
friend exception_ptr current_exception();
friend void rethrow_exception(exception_ptr); // noreturn
};
template<class _E>
exception_ptr
make_exception_ptr(_E __e)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
throw __e;
}
catch (...)
{
return current_exception();
}
#endif
}
// nested_exception
class _LIBCPP_EXCEPTION_ABI nested_exception
{
exception_ptr __ptr_;
public:
nested_exception();
// nested_exception(const nested_exception&) throw() = default;
// nested_exception& operator=(const nested_exception&) throw() = default;
virtual ~nested_exception();
// access functions
void rethrow_nested /*[[noreturn]]*/ () const;
exception_ptr nested_ptr() const {return __ptr_;}
};
template <class _Tp>
struct __nested
: public _Tp,
public nested_exception
{
explicit __nested(const _Tp& __t) : _Tp(__t) {}
};
template <class _Tp>
void
#ifdef _LIBCPP_MOVE
throw_with_nested /*[[noreturn]]*/ (_Tp&& __t, typename enable_if<
is_class<typename remove_reference<_Tp>::type>::value &&
!is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
>::type* = 0)
#else
throw_with_nested (_Tp& __t, typename enable_if<
is_class<_Tp>::value && !is_base_of<nested_exception, _Tp>::value
>::type* = 0)
#endif
{
#ifndef _LIBCPP_NO_EXCEPTIONS
throw __nested<typename remove_reference<_Tp>::type>(_STD::forward<_Tp>(__t));
#endif
}
template <class _Tp>
void
#ifdef _LIBCPP_MOVE
throw_with_nested /*[[noreturn]]*/ (_Tp&& __t, typename enable_if<
!is_class<typename remove_reference<_Tp>::type>::value ||
is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
>::type* = 0)
#else
throw_with_nested (_Tp& __t, typename enable_if<
!is_class<_Tp>::value || is_base_of<nested_exception, _Tp>::value
>::type* = 0)
#endif
{
#ifndef _LIBCPP_NO_EXCEPTIONS
throw _STD::forward<_Tp>(__t);
#endif
}
template <class _E>
inline
void
rethrow_if_nested(const _E& __e, typename enable_if<
is_polymorphic<_E>::value
>::type* = 0)
{
const nested_exception* __nep = dynamic_cast<const nested_exception*>(&__e);
if (__nep)
__nep->rethrow_nested();
}
template <class _E>
inline
void
rethrow_if_nested(const _E& __e, typename enable_if<
!is_polymorphic<_E>::value
>::type* = 0)
{
}
} // std
#endif // _LIBCPP_EXCEPTION
|
