| 1 | |
|---|---|
| 2 | // Copyright Oliver Kowalke 2013. |
| 3 | // Distributed under the Boost Software License, Version 1.0. |
| 4 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
| 6 | |
| 7 | #include "boost/fiber/exceptions.hpp" |
| 8 | |
| 9 | namespace boost { |
| 10 | namespace fibers { |
| 11 | |
| 12 | class future_error_category : public std::error_category { |
| 13 | public: |
| 14 | const char* name() const noexcept override { |
| 15 | return "fiber-future"; |
| 16 | } |
| 17 | |
| 18 | std::error_condition default_error_condition( int ev) const noexcept override { |
| 19 | switch ( static_cast< future_errc >( ev) ) { |
| 20 | case future_errc::broken_promise: |
| 21 | return std::error_condition{ |
| 22 | static_cast< int >( future_errc::broken_promise), |
| 23 | future_category() }; |
| 24 | case future_errc::future_already_retrieved: |
| 25 | return std::error_condition{ |
| 26 | static_cast< int >( future_errc::future_already_retrieved), |
| 27 | future_category() }; |
| 28 | case future_errc::promise_already_satisfied: |
| 29 | return std::error_condition{ |
| 30 | static_cast< int >( future_errc::promise_already_satisfied), |
| 31 | future_category() }; |
| 32 | case future_errc::no_state: |
| 33 | return std::error_condition{ |
| 34 | static_cast< |
| 35 | int >( future_errc::no_state), |
| 36 | future_category() }; |
| 37 | default: |
| 38 | return std::error_condition{ ev, * this }; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | bool equivalent( std::error_code const& code, int condition) const noexcept override { |
| 43 | return * this == code.category() && |
| 44 | static_cast< int >( default_error_condition( ev: code.value() ).value() ) == condition; |
| 45 | } |
| 46 | |
| 47 | std::string message( int ev) const override { |
| 48 | switch ( static_cast< future_errc >( ev) ) { |
| 49 | case future_errc::broken_promise: |
| 50 | return std::string{ "The associated promise has been destructed prior " |
| 51 | "to the associated state becoming ready."}; |
| 52 | case future_errc::future_already_retrieved: |
| 53 | return std::string{ "The future has already been retrieved from " |
| 54 | "the promise or packaged_task."}; |
| 55 | case future_errc::promise_already_satisfied: |
| 56 | return std::string{ "The state of the promise has already been set."}; |
| 57 | case future_errc::no_state: |
| 58 | return std::string{ "Operation not permitted on an object without " |
| 59 | "an associated state."}; |
| 60 | } |
| 61 | return std::string{ "unspecified future_errc value\n"}; |
| 62 | } |
| 63 | }; |
| 64 | |
| 65 | BOOST_FIBERS_DECL |
| 66 | std::error_category const& future_category() noexcept { |
| 67 | static fibers::future_error_category cat; |
| 68 | return cat; |
| 69 | } |
| 70 | |
| 71 | }} |
| 72 |