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openvpn3/openvpn/common/exception.hpp

104 lines
2.8 KiB
C++

//
// exception.hpp
// OpenVPN
//
// Copyright (c) 2012 OpenVPN Technologies, Inc. All rights reserved.
//
#ifndef OPENVPN_COMMON_EXCEPTION_H
#define OPENVPN_COMMON_EXCEPTION_H
#include <string>
#include <sstream>
#include <exception>
#include <boost/system/error_code.hpp>
#ifdef OPENVPN_DEBUG_EXCEPTION
// preprocessor hack to get __FILE__:__LINE__ rendered as a string
# define OPENVPN_STRINGIZE(x) OPENVPN_STRINGIZE2(x)
# define OPENVPN_STRINGIZE2(x) #x
# define OPENVPN_FILE_LINE "/" __FILE__ ":" OPENVPN_STRINGIZE(__LINE__)
#else
# define OPENVPN_FILE_LINE
#endif
namespace openvpn {
template <typename ErrorCode>
inline std::string errinfo(ErrorCode err)
{
boost::system::error_code e(err, boost::system::system_category());
return e.message();
}
// string exception class
class Exception : public std::exception
{
public:
Exception(std::string err) : err_(err) {}
virtual const char* what() const throw() { return err_.c_str(); }
virtual ~Exception() throw() {}
private:
std::string err_;
};
// define a simple custom exception class with no extra info
# define OPENVPN_SIMPLE_EXCEPTION(C) \
class C : public std::exception { \
public: \
virtual const char* what() const throw() { return #C OPENVPN_FILE_LINE; } \
}
// define a simple custom exception class with no extra info that inherits from a custom base
# define OPENVPN_SIMPLE_EXCEPTION_INHERIT(B, C) \
class C : public B { \
public: \
virtual const char* what() const throw() { return #C OPENVPN_FILE_LINE; } \
}
// define a custom exception class that allows extra info
# define OPENVPN_EXCEPTION(C) \
class C : public openvpn::Exception { \
public: \
C() : openvpn::Exception(#C OPENVPN_FILE_LINE) {} \
C(std::string err) : openvpn::Exception(#C OPENVPN_FILE_LINE ": " + err) {} \
}
// define a custom exception class that allows extra info, and inherits from a custom base
# define OPENVPN_EXCEPTION_INHERIT(B, C) \
class C : public B { \
public: \
C() : B(#C OPENVPN_FILE_LINE) {} \
C(std::string err) : B(#C OPENVPN_FILE_LINE ": " + err) {} \
}
// throw an Exception with stringstream concatenation allowed
# define OPENVPN_THROW_EXCEPTION(stuff) \
do { \
std::ostringstream _ovpn_exc; \
_ovpn_exc << stuff; \
throw openvpn::Exception(_ovpn_exc.str()); \
} while (0)
// throw an OPENVPN_EXCEPTION class with stringstream concatenation allowed
# define OPENVPN_THROW(exc, stuff) \
do { \
std::ostringstream _ovpn_exc; \
_ovpn_exc << stuff; \
throw exc(_ovpn_exc.str()); \
} while (0)
// properly rethrow an exception that might be derived from Exception
inline void throw_ref(const std::exception& e)
{
const Exception* ex = dynamic_cast<const Exception*>(&e);
if (ex)
throw *ex;
else
throw e;
}
} // namespace openvpn
#endif // OPENVPN_COMMON_EXCEPTION_H