144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
/*
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* Copyright 2016-2021 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef EXCEPTION_HXX
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#define EXCEPTION_HXX
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#include <exception>
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#include <string>
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#include <utility>
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/**
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* Throws the specified exception. There is an overload for
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* std::exception_ptr which throws the contained exception instead of
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* the std::exception_ptr itself.
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*/
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template<typename T>
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[[noreturn]]
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inline void
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ThrowException(T &&t)
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{
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throw std::forward<T>(t);
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}
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[[noreturn]]
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inline void
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ThrowException(std::exception_ptr ep)
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{
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std::rethrow_exception(ep);
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}
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/**
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* Create a nested exception, wrapping #ep inside the
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* std::current_exception().
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*/
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template<typename T>
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inline std::exception_ptr
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NestCurrentException(T &&t) noexcept
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{
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try {
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std::throw_with_nested(std::forward<T>(t));
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} catch (...) {
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return std::current_exception();
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}
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}
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/**
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* Create a nested exception, wrapping #ep inside (a copy of) #t.
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*/
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template<typename T>
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inline std::exception_ptr
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NestException(std::exception_ptr ep, T &&t) noexcept
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{
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try {
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std::rethrow_exception(ep);
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} catch (...) {
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return NestCurrentException(std::forward<T>(t));
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}
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}
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/**
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* Find an instance of #T in the nested exception chain, and return a
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* pointer. Returns nullptr if no such instance was found.
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*/
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template<typename T>
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[[gnu::pure]]
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inline const T *
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FindNested(std::exception_ptr ep) noexcept
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{
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try {
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std::rethrow_exception(ep);
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} catch (const T &t) {
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return &t;
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} catch (const std::nested_exception &ne) {
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return FindNested<T>(ne.nested_ptr());
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} catch (...) {
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}
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return nullptr;
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}
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/**
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* Find an instance of #T in the nested exception chain, and rethrow
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* it. Does nothing if no such instance was found.
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*/
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template<typename T>
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inline void
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FindRetrowNested(std::exception_ptr ep)
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{
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try {
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std::rethrow_exception(ep);
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} catch (const T &t) {
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throw;
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} catch (const std::nested_exception &ne) {
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FindRetrowNested<T>(ne.nested_ptr());
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} catch (...) {
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}
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}
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/**
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* Obtain the full concatenated message of an exception and its nested
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* chain.
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*/
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std::string
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GetFullMessage(const std::exception &e,
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const char *fallback="Unknown exception",
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const char *separator="; ") noexcept;
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/**
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* Obtain the full concatenated message of an exception and its nested
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* chain.
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*/
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std::string
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GetFullMessage(std::exception_ptr ep,
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const char *fallback="Unknown exception",
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const char *separator="; ") noexcept;
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#endif
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