151 lines
9.2 KiB
C++
151 lines
9.2 KiB
C++
/* Try operation macros
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(C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (59 commits)
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File Created: July 2017
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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_TRY_HPP
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#define BOOST_OUTCOME_TRY_HPP
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#include "success_failure.hpp"
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namespace std // NOLINT
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{
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namespace experimental
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{
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template <class T, class E> class expected;
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template <class E> class unexpected;
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} // namespace experimental
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} // namespace std
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BOOST_OUTCOME_V2_NAMESPACE_BEGIN
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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BOOST_OUTCOME_TEMPLATE(class T)
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BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<T>().as_failure()))
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inline decltype(auto) try_operation_return_as(T &&v)
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{
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return static_cast<T &&>(v).as_failure();
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}
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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template <class T, class E> inline auto try_operation_return_as(const std::experimental::expected<T, E> &v)
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{
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return std::experimental::unexpected<E>(v.error());
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}
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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template <class T, class E> inline auto try_operation_return_as(std::experimental::expected<T, E> &&v)
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{
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return std::experimental::unexpected<E>(static_cast<std::experimental::expected<T, E> &&>(v).error());
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}
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namespace detail
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{
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BOOST_OUTCOME_TEMPLATE(class T)
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BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<T>().assume_value()))
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inline decltype(auto) try_extract_value(T &&v) { return static_cast<T &&>(v).assume_value(); }
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template <class T, class... Args> inline decltype(auto) try_extract_value(T &&v, Args &&... /*unused*/) { return static_cast<T &&>(v).value(); }
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} // namespace detail
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BOOST_OUTCOME_V2_NAMESPACE_END
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#define BOOST_OUTCOME_TRY_GLUE2(x, y) x##y
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#define BOOST_OUTCOME_TRY_GLUE(x, y) BOOST_OUTCOME_TRY_GLUE2(x, y)
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#define BOOST_OUTCOME_TRY_UNIQUE_NAME BOOST_OUTCOME_TRY_GLUE(_outcome_try_unique_name_temporary, __COUNTER__)
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#define BOOST_OUTCOME_TRY_RETURN_ARG_COUNT(_1_, _2_, _3_, _4_, _5_, _6_, _7_, _8_, count, ...) count
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#define BOOST_OUTCOME_TRY_EXPAND_ARGS(args) BOOST_OUTCOME_TRY_RETURN_ARG_COUNT args
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#define BOOST_OUTCOME_TRY_COUNT_ARGS_MAX8(...) BOOST_OUTCOME_TRY_EXPAND_ARGS((__VA_ARGS__, 8, 7, 6, 5, 4, 3, 2, 1, 0))
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#define BOOST_OUTCOME_TRY_OVERLOAD_MACRO2(name, count) name##count
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#define BOOST_OUTCOME_TRY_OVERLOAD_MACRO1(name, count) BOOST_OUTCOME_TRY_OVERLOAD_MACRO2(name, count)
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#define BOOST_OUTCOME_TRY_OVERLOAD_MACRO(name, count) BOOST_OUTCOME_TRY_OVERLOAD_MACRO1(name, count)
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#define BOOST_OUTCOME_TRY_OVERLOAD_GLUE(x, y) x y
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#define BOOST_OUTCOME_TRY_CALL_OVERLOAD(name, ...) BOOST_OUTCOME_TRY_OVERLOAD_GLUE(BOOST_OUTCOME_TRY_OVERLOAD_MACRO(name, BOOST_OUTCOME_TRY_COUNT_ARGS_MAX8(__VA_ARGS__)), (__VA_ARGS__))
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#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 8
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wparentheses"
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#endif
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#define BOOST_OUTCOME_TRYV2(unique, ...) \
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auto && (unique) = (__VA_ARGS__); \
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if(!(unique).has_value()) \
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return BOOST_OUTCOME_V2_NAMESPACE::try_operation_return_as(static_cast<decltype(unique) &&>(unique))
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#define BOOST_OUTCOME_TRY2(unique, v, ...) \
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BOOST_OUTCOME_TRYV2(unique, __VA_ARGS__); \
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auto && (v) = BOOST_OUTCOME_V2_NAMESPACE::detail::try_extract_value(static_cast<decltype(unique) &&>(unique))
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#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 8
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#pragma GCC diagnostic pop
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#endif
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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#define BOOST_OUTCOME_TRYV(...) BOOST_OUTCOME_TRYV2(BOOST_OUTCOME_TRY_UNIQUE_NAME, __VA_ARGS__)
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#if defined(__GNUC__) || defined(__clang__)
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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#define BOOST_OUTCOME_TRYX(...) \
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({ \
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auto &&res = (__VA_ARGS__); \
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if(!res.has_value()) \
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return BOOST_OUTCOME_V2_NAMESPACE::try_operation_return_as(static_cast<decltype(res) &&>(res)); \
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BOOST_OUTCOME_V2_NAMESPACE::detail::try_extract_value(static_cast<decltype(res) &&>(res)); \
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\
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})
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#endif
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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#define BOOST_OUTCOME_TRYA(v, ...) BOOST_OUTCOME_TRY2(BOOST_OUTCOME_TRY_UNIQUE_NAME, v, __VA_ARGS__)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY8(a, b, c, d, e, f, g, h) BOOST_OUTCOME_TRYA(a, b, c, d, e, f, g, h)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY7(a, b, c, d, e, f, g) BOOST_OUTCOME_TRYA(a, b, c, d, e, f, g)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY6(a, b, c, d, e, f) BOOST_OUTCOME_TRYA(a, b, c, d, e, f)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY5(a, b, c, d, e) BOOST_OUTCOME_TRYA(a, b, c, d, e)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY4(a, b, c, d) BOOST_OUTCOME_TRYA(a, b, c, d)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY3(a, b, c) BOOST_OUTCOME_TRYA(a, b, c)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY2(a, b) BOOST_OUTCOME_TRYA(a, b)
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#define BOOST_OUTCOME_TRY_INVOKE_TRY1(a) BOOST_OUTCOME_TRYV(a)
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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#define BOOST_OUTCOME_TRY(...) BOOST_OUTCOME_TRY_CALL_OVERLOAD(BOOST_OUTCOME_TRY_INVOKE_TRY, __VA_ARGS__)
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#endif
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