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exception_ptr_lite.hpp
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exception_ptr_lite.hpp
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// Copyright (C) 2013 Martin Moene <martin.moene@gmail.com>
//
// Use, modification, and distribution is subject to 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)
//
// Note: exception_ptr lite is created to propagate exceptions via Andrei
// Alexandrescu's excpected<T> with compilers that lack C++11's exception
// propagation facility and doing so without adding a dependency on e.g. Boost.
//
// exception_ptr lite is not a full replacement of C++11's exception
// propagation facility. Specifically std::current_exception() is missing,
// so that you cannot intercept an exception in it's original guise.
#ifndef STD11_EXCEPTION_PTR_LITE_H_INCLUDED
#define STD11_EXCEPTION_PTR_LITE_H_INCLUDED
#include <cassert>
#include <ios>
#include <stdexcept>
#include <typeinfo>
#if defined( __clang__ ) // clang
# define STD11_EPL_HAS_STD_SHARED
#elif defined( __GNUC__ ) && __cplusplus >= 201103L // g++ -std=c++11
# define STD11_EPL_HAS_STD_SHARED
#elif defined( _MSC_VER )
# define STD11_EPL_COMPILER_IS_MSVC
# if ( _MSC_VER >= 1200 ) && ( _MSC_VER < 1300 ) // VC6
# define STD11_EPL_COMPILER_IS_MSVC6
# elif ( _MSC_VER >= 1600 ) // VC2010+
# define STD11_EPL_HAS_STD_SHARED
# endif
#endif
//#define STD11_USE_AUTO_PTR
// std::auto_ptr<>
// Without option -fpermissive g++ generates a compilation error because
// the copy-initialiser constructor moves content from its const argument.
#ifdef STD11_USE_AUTO_PTR
# include <memory>
# define STD11_SMART_PTR_NAME auto_ptr
# define STD11_SMART_PTR(T) std::STD11_SMART_PTR_NAME<T>
//#pragma message ("Using std::auto_ptr<>")
#else
# if defined( STD11_EPL_HAS_STD_SHARED )
# include <memory>
# define STD11_SMART_PTR_NAME shared_ptr
# define STD11_SMART_PTR(T) std::STD11_SMART_PTR_NAME<T>
//#pragma message ("Using std::shared_ptr<>")
# elif defined( STD11_EPL_COMPILER_IS_MSVC6 )
// VC6 correction for Boost 1.51 boost/shared_ptr.hpp:
# include <cstdlib>
namespace std { using ::abort; }
# include <boost/shared_ptr.hpp>
# define STD11_SMART_PTR_NAME shared_ptr
# define STD11_SMART_PTR(T) boost::STD11_SMART_PTR_NAME<T>
//#pragma message ("Using boost::shared_ptr<>")
# else
# include <boost/shared_ptr.hpp>
# define STD11_SMART_PTR_NAME shared_ptr
# define STD11_SMART_PTR(T) boost::STD11_SMART_PTR_NAME<T>
//#pragma message ("Using boost::shared_ptr<>")
# endif
#endif
namespace std11
{
/**
* interface for exceptions to be cloned.
*
* This is modelled after the following proposal:
* Beman Dawes. 5 May 2007.
* Cloning and Throwing Dynamically Typed Exceptions (Rev 1)
* (Library-only support for exception propagation from threads)
* http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2229.html
*/
class cloneable
{
public:
typedef STD11_SMART_PTR(cloneable) ptr_type;
virtual ptr_type dynamic_clone() const = 0;
virtual void dynamic_throw() const = 0;
virtual ~cloneable() {}
};
/**
* exception_ptr type.
*/
typedef cloneable::ptr_type exception_ptr;
#define STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( E ) \
class E : public virtual cloneable \
{ \
public: \
~E() throw() {} \
\
E( std::E const & e ) : ex( new std::E(e) ) {} \
\
E( E const & other ) : ex( other.ex ) {} \
\
ptr_type dynamic_clone() const { return ptr_type( new E(*this) ); } \
\
void dynamic_throw() const { throw *ex; } \
\
private: \
STD11_SMART_PTR(std::E) ex; \
};
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( exception )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( logic_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( invalid_argument )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( domain_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( length_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( out_of_range )
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( future_error ) // C++11
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_optional_access ) //(C++14)
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( runtime_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( range_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( overflow_error )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( underflow_error )
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( system_error ) // (C++11)
// NTS: macro doesn't support ::
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( ios_base::failure ) // (derived from runtime_error since C++11 )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_typeid )
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_cast )
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_weak_ptr ) // (C++11)
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_function_call ) // (C++11)
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_alloc )
//STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_array_new_length ) // (C++11)
STD11_DEFINE_DYNAMIC_EXCEPTION_TYPE( bad_exception )
/**
* default conversion shim:
*/
inline cloneable const &
make_cloneable( cloneable const & e )
{
return e;
}
/**
* define conversion shims for a standard exception:
*/
#define STD11_DEFINE_MAKE_CLONEABLE(E) \
inline E \
make_cloneable( std::E const & e ) \
{ \
return E( e ); \
}
STD11_DEFINE_MAKE_CLONEABLE( exception )
STD11_DEFINE_MAKE_CLONEABLE( logic_error )
STD11_DEFINE_MAKE_CLONEABLE( invalid_argument )
STD11_DEFINE_MAKE_CLONEABLE( domain_error )
STD11_DEFINE_MAKE_CLONEABLE( length_error )
STD11_DEFINE_MAKE_CLONEABLE( out_of_range )
//STD11_DEFINE_MAKE_CLONEABLE( future_error ) // C++11
//STD11_DEFINE_MAKE_CLONEABLE( bad_optional_access ) //(C++14)
STD11_DEFINE_MAKE_CLONEABLE( runtime_error )
STD11_DEFINE_MAKE_CLONEABLE( range_error )
STD11_DEFINE_MAKE_CLONEABLE( overflow_error )
STD11_DEFINE_MAKE_CLONEABLE( underflow_error )
//STD11_DEFINE_MAKE_CLONEABLE( system_error ) // (C++11)
// NTS: macro doesn't support ::
//STD11_DEFINE_MAKE_CLONEABLE( ios_base::failure ) // (derived from runtime_error since C++11)
STD11_DEFINE_MAKE_CLONEABLE( bad_typeid )
STD11_DEFINE_MAKE_CLONEABLE( bad_cast )
//STD11_DEFINE_MAKE_CLONEABLE( bad_weak_ptr ) // (C++11)
//STD11_DEFINE_MAKE_CLONEABLE( bad_function_call ) // (C++11)
STD11_DEFINE_MAKE_CLONEABLE( bad_alloc )
//STD11_DEFINE_MAKE_CLONEABLE( bad_array_new_length ) // (C++11)
STD11_DEFINE_MAKE_CLONEABLE( bad_exception )
/**
* make_exception_ptr given a standard or user-defined exception.
*/
template <typename E>
inline exception_ptr
make_exception_ptr( E const & e )
{
// no need to throw as we don't have a fully implemented current_exception()
return make_cloneable( e ).dynamic_clone();
}
/**
* rethrow_exception given in p.
*/
inline void
rethrow_exception( exception_ptr p )
{
assert( p.get() != NULL );
p->dynamic_throw();
}
/**
* current_exception (lite) only supports standard exceptions.
*/
inline exception_ptr
current_exception()
{
try
{
throw ;
}
catch ( std::bad_exception const & e ) { return make_exception_ptr( e ); }
catch ( std::bad_alloc const & e ) { return make_exception_ptr( e ); }
catch ( std::bad_cast const & e ) { return make_exception_ptr( e ); }
catch ( std::bad_typeid const & e ) { return make_exception_ptr( e ); }
catch ( std::ios_base::failure const & e ) { return make_exception_ptr( e ); }
catch ( std::underflow_error const & e ) { return make_exception_ptr( e ); }
catch ( std::overflow_error const & e ) { return make_exception_ptr( e ); }
catch ( std::range_error const & e ) { return make_exception_ptr( e ); }
catch ( std::runtime_error const & e ) { return make_exception_ptr( e ); }
catch ( std::out_of_range const & e ) { return make_exception_ptr( e ); }
catch ( std::length_error const & e ) { return make_exception_ptr( e ); }
catch ( std::domain_error const & e ) { return make_exception_ptr( e ); }
catch ( std::invalid_argument const & e ) { return make_exception_ptr( e ); }
catch ( std::logic_error const & e ) { return make_exception_ptr( e ); }
catch ( std::exception const & e ) { return make_exception_ptr( e ); }
catch (...)
{
return make_exception_ptr(
std::runtime_error( "std::current_exception(): unknown exception" ) );
}
}
} // namespace std11
#endif // STD11_EXCEPTION_PTR_LITE_H_INCLUDED