977ed18d
 Hu Chunming
提交三方库
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// Copyright Oliver Kowalke 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/fiber/exceptions.hpp"
namespace boost {
namespace fibers {
class future_error_category : public std::error_category {
public:
const char* name() const noexcept override {
return "fiber-future";
}
std::error_condition default_error_condition( int ev) const noexcept override {
switch ( static_cast< future_errc >( ev) ) {
case future_errc::broken_promise:
return std::error_condition{
static_cast< int >( future_errc::broken_promise),
future_category() };
case future_errc::future_already_retrieved:
return std::error_condition{
static_cast< int >( future_errc::future_already_retrieved),
future_category() };
case future_errc::promise_already_satisfied:
return std::error_condition{
static_cast< int >( future_errc::promise_already_satisfied),
future_category() };
case future_errc::no_state:
return std::error_condition{
static_cast<
int >( future_errc::no_state),
future_category() };
default:
return std::error_condition{ ev, * this };
}
}
bool equivalent( std::error_code const& code, int condition) const noexcept override {
return * this == code.category() &&
static_cast< int >( default_error_condition( code.value() ).value() ) == condition;
}
std::string message( int ev) const override {
switch ( static_cast< future_errc >( ev) ) {
case future_errc::broken_promise:
return std::string{ "The associated promise has been destructed prior "
"to the associated state becoming ready." };
case future_errc::future_already_retrieved:
return std::string{ "The future has already been retrieved from "
"the promise or packaged_task." };
case future_errc::promise_already_satisfied:
return std::string{ "The state of the promise has already been set." };
case future_errc::no_state:
return std::string{ "Operation not permitted on an object without "
"an associated state." };
}
return std::string{ "unspecified future_errc value\n" };
}
};
BOOST_FIBERS_DECL
std::error_category const& future_category() noexcept {
static fibers::future_error_category cat;
return cat;
}
}}
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