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72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
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// Copyright Oliver Kowalke 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "boost/fiber/exceptions.hpp"
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namespace boost {
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namespace fibers {
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class future_error_category : public std::error_category {
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public:
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virtual const char* name() const noexcept {
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return "future";
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}
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virtual std::error_condition default_error_condition( int ev) const noexcept {
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switch ( ev) {
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case 1: return std::error_condition(
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static_cast< int >( future_errc::broken_promise),
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future_category() );
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case 2: return std::error_condition(
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static_cast< int >( future_errc::future_already_retrieved),
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future_category() );
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case 3: return std::error_condition(
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static_cast< int >( future_errc::promise_already_satisfied),
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future_category() );
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case 4: return std::error_condition(
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static_cast<
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int >( future_errc::no_state),
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future_category() );
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default:
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return std::error_condition(
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static_cast<
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int >( future_errc::unknown),
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future_category() );
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}
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}
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virtual bool equivalent( std::error_code const& code, int condition) const noexcept {
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return * this == code.category() &&
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static_cast< int >( default_error_condition( code.value() ).value() ) == condition;
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}
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virtual std::string message( int ev) const {
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switch ( static_cast< future_errc >( ev) ) {
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case future_errc::unknown:
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return std::string("Unknown error");
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case future_errc::broken_promise:
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return std::string("The associated promise has been destructed prior "
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"to the associated state becoming ready.");
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case future_errc::future_already_retrieved:
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return std::string("The future has already been retrieved from "
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"the promise or packaged_task.");
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case future_errc::promise_already_satisfied:
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return std::string("The state of the promise has already been set.");
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case future_errc::no_state:
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return std::string("Operation not permitted on an object without "
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"an associated state.");
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}
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return std::string("unspecified future_errc value\n");
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}
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};
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std::error_category const& future_category() noexcept {
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static fibers::future_error_category cat;
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return cat;
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}
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}}
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