diff options
Diffstat (limited to 'boost/outcome/experimental/status-code/status_code_ptr.hpp')
| -rw-r--r-- | boost/outcome/experimental/status-code/status_code_ptr.hpp | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/boost/outcome/experimental/status-code/status_code_ptr.hpp b/boost/outcome/experimental/status-code/status_code_ptr.hpp new file mode 100644 index 0000000000..0761fb97d5 --- /dev/null +++ b/boost/outcome/experimental/status-code/status_code_ptr.hpp @@ -0,0 +1,137 @@ +/* Pointer to a SG14 status_code +(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (5 commits) +File Created: Sep 2018 + + +Boost Software License - Version 1.0 - August 17th, 2003 + +Permission is hereby granted, free of charge, to any person or organization +obtaining a copy of the software and accompanying documentation covered by +this license (the "Software") to use, reproduce, display, distribute, +execute, and transmit the Software, and to prepare derivative works of the +Software, and to permit third-parties to whom the Software is furnished to +do so, all subject to the following: + +The copyright notices in the Software and this entire statement, including +the above license grant, this restriction and the following disclaimer, +must be included in all copies of the Software, in whole or in part, and +all derivative works of the Software, unless such copies or derivative +works are solely in the form of machine-executable object code generated by +a source language processor. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT +SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE +FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. +*/ + +#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_STATUS_CODE_PTR_HPP +#define BOOST_OUTCOME_SYSTEM_ERROR2_STATUS_CODE_PTR_HPP + +#include "status_code.hpp" + +BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN + +namespace detail +{ + template <class StatusCode> class indirecting_domain : public status_code_domain + { + template <class DomainType> friend class status_code; + using _base = status_code_domain; + + public: + using value_type = StatusCode *; + using _base::string_ref; + + constexpr indirecting_domain() noexcept : _base(0xc44f7bdeb2cc50e9 ^ typename StatusCode::domain_type().id() /* unique-ish based on domain's unique id */) {} + indirecting_domain(const indirecting_domain &) = default; + indirecting_domain(indirecting_domain &&) = default; // NOLINT + indirecting_domain &operator=(const indirecting_domain &) = default; + indirecting_domain &operator=(indirecting_domain &&) = default; // NOLINT + ~indirecting_domain() = default; + +#if __cplusplus < 201402L && !defined(_MSC_VER) + static inline const indirecting_domain &get() + { + static indirecting_domain v; + return v; + } +#else + static inline constexpr const indirecting_domain &get(); +#endif + + virtual string_ref name() const noexcept override { return typename StatusCode::domain_type().name(); } // NOLINT + protected: + using _mycode = status_code<indirecting_domain>; + virtual bool _do_failure(const status_code<void> &code) const noexcept override // NOLINT + { + assert(code.domain() == *this); + const auto &c = static_cast<const _mycode &>(code); // NOLINT + return typename StatusCode::domain_type()._do_failure(*c.value()); + } + virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override // NOLINT + { + assert(code1.domain() == *this); + const auto &c1 = static_cast<const _mycode &>(code1); // NOLINT + return typename StatusCode::domain_type()._do_equivalent(*c1.value(), code2); + } + virtual generic_code _generic_code(const status_code<void> &code) const noexcept override // NOLINT + { + assert(code.domain() == *this); + const auto &c = static_cast<const _mycode &>(code); // NOLINT + return typename StatusCode::domain_type()._generic_code(*c.value()); + } + virtual string_ref _do_message(const status_code<void> &code) const noexcept override // NOLINT + { + assert(code.domain() == *this); + const auto &c = static_cast<const _mycode &>(code); // NOLINT + return typename StatusCode::domain_type()._do_message(*c.value()); + } +#if defined(_CPPUNWIND) || defined(__EXCEPTIONS) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE) + BOOST_OUTCOME_SYSTEM_ERROR2_NORETURN virtual void _do_throw_exception(const status_code<void> &code) const override // NOLINT + { + assert(code.domain() == *this); + const auto &c = static_cast<const _mycode &>(code); // NOLINT + typename StatusCode::domain_type()._do_throw_exception(*c.value()); + } +#endif + virtual void _do_erased_copy(status_code<void> &dst, const status_code<void> &src, size_t /*unused*/) const override // NOLINT + { + assert(dst.domain() == *this); + assert(src.domain() == *this); + auto &d = static_cast<_mycode &>(dst); // NOLINT + const auto &_s = static_cast<const _mycode &>(src); // NOLINT + const StatusCode &s = *_s.value(); + new(&d) _mycode(in_place, new StatusCode(s)); + } + virtual void _do_erased_destroy(status_code<void> &code, size_t /*unused*/) const noexcept override // NOLINT + { + assert(code.domain() == *this); + auto &c = static_cast<_mycode &>(code); // NOLINT + delete c.value(); // NOLINT + } + }; +#if __cplusplus >= 201402L || defined(_MSC_VER) + template <class StatusCode> constexpr indirecting_domain<StatusCode> _indirecting_domain{}; + template <class StatusCode> inline constexpr const indirecting_domain<StatusCode> &indirecting_domain<StatusCode>::get() { return _indirecting_domain<StatusCode>; } +#endif +} // namespace detail + +/*! Make an erased status code which indirects to a dynamically allocated status code. +This is useful for shoehorning a rich status code with large value type into a small +erased status code like `system_code`, with which the status code generated by this +function is compatible. Note that this function can throw due to `bad_alloc`. +*/ +template <class T, typename std::enable_if<is_status_code<T>::value, bool>::type = true> // +inline status_code<erased<typename std::add_pointer<typename std::decay<T>::type>::type>> make_status_code_ptr(T &&v) +{ + using status_code_type = typename std::decay<T>::type; + return status_code<detail::indirecting_domain<status_code_type>>(in_place, new status_code_type(static_cast<T &&>(v))); +} + +BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END + +#endif |