61 lines
4.3 KiB
C++
61 lines
4.3 KiB
C++
/* Policies for result and outcome
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(C) 2018-2022 Niall Douglas <http://www.nedproductions.biz/> (4 commits)
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File Created: Sep 2018
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BOOST_OUTCOME_POLICY_FAIL_TO_COMPILE_OBSERVERS_HPP
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#define BOOST_OUTCOME_POLICY_FAIL_TO_COMPILE_OBSERVERS_HPP
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#include "base.hpp"
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BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
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#define BOOST_OUTCOME_FAIL_TO_COMPILE_OBSERVERS_MESSAGE \
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"Attempt to wide observe value, error or " \
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"exception for a basic_result/basic_outcome given an EC or EP type which is not void, and for whom " \
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"trait::is_error_code_available<EC>, trait::is_exception_ptr_available<EC>, and trait::is_exception_ptr_available<EP> " \
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"are all false. Please specify a NoValuePolicy to tell basic_result/basic_outcome what to do, or else use " \
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"a more specific convenience type alias such as unchecked<T, E> to indicate you want the wide " \
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"observers to be narrow, or checked<T, E> to indicate you always want an exception throw etc."
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namespace policy
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{
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struct fail_to_compile_observers : base
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{
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template <class Impl> static constexpr void wide_value_check(Impl && /* unused */) { static_assert(!std::is_same<Impl, Impl>::value, BOOST_OUTCOME_FAIL_TO_COMPILE_OBSERVERS_MESSAGE); }
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template <class Impl> static constexpr void wide_error_check(Impl && /* unused */) { static_assert(!std::is_same<Impl, Impl>::value, BOOST_OUTCOME_FAIL_TO_COMPILE_OBSERVERS_MESSAGE); }
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template <class Impl> static constexpr void wide_exception_check(Impl && /* unused */) { static_assert(!std::is_same<Impl, Impl>::value, BOOST_OUTCOME_FAIL_TO_COMPILE_OBSERVERS_MESSAGE); }
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};
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} // namespace policy
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#undef BOOST_OUTCOME_FAIL_TO_COMPILE_OBSERVERS_MESSAGE
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BOOST_OUTCOME_V2_NAMESPACE_END
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#endif
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