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/*
* Copyright 2016-2020 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef EXCEPTION_HXX
#define EXCEPTION_HXX
#include <exception>
#include <string>
#include <utility>
/**
* Throws the specified exception. There is an overload for
* std::exception_ptr which throws the contained exception instead of
* the std::exception_ptr itself.
*/
template<typename T>
[[noreturn]]
inline void
ThrowException(T &&t)
{
throw std::forward<T>(t);
}
[[noreturn]]
inline void
ThrowException(std::exception_ptr ep)
{
std::rethrow_exception(ep);
}
/**
* Create a nested exception, wrapping #ep inside the
* std::current_exception().
*/
template<typename T>
inline std::exception_ptr
NestCurrentException(T &&t) noexcept
{
try {
std::throw_with_nested(std::forward<T>(t));
} catch (...) {
return std::current_exception();
}
}
/**
* Create a nested exception, wrapping #ep inside (a copy of) #t.
*/
template<typename T>
inline std::exception_ptr
NestException(std::exception_ptr ep, T &&t) noexcept
{
try {
std::rethrow_exception(ep);
} catch (...) {
return NestCurrentException(std::forward<T>(t));
}
}
/**
* Find an instance of #T in the nested exception chain, and rethrow
* it. Does nothing of no such instance was found.
*/
template<typename T>
inline void
FindRetrowNested(std::exception_ptr ep)
{
try {
std::rethrow_exception(ep);
} catch (const T &t) {
throw;
} catch (const std::exception &e) {
try {
std::rethrow_if_nested(e);
} catch (...) {
FindRetrowNested<T>(std::current_exception());
}
} catch (const std::nested_exception &ne) {
FindRetrowNested<T>(ne.nested_ptr());
} catch (...) {
}
}
/**
* Obtain the full concatenated message of an exception and its nested
* chain.
*/
std::string
GetFullMessage(const std::exception &e,
const char *fallback="Unknown exception",
const char *separator="; ") noexcept;
/**
* Obtain the full concatenated message of an exception and its nested
* chain.
*/
std::string
GetFullMessage(std::exception_ptr ep,
const char *fallback="Unknown exception",
const char *separator="; ") noexcept;
#endif
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