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future.cpp
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64 lines (53 loc) · 1.83 KB
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// (C) Copyright 2012 Vicente J. Botet Escriba
// Use, modification and distribution are subject to 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/thread/detail/config.hpp>
#ifndef BOOST_NO_EXCEPTIONS
#include <boost/thread/futures/future_error_code.hpp>
#include <string>
namespace boost
{
namespace thread_detail
{
class future_error_category :
public boost::system::error_category
{
public:
virtual const char* name() const BOOST_NOEXCEPT;
virtual std::string message(int ev) const;
};
const char*
future_error_category::name() const BOOST_NOEXCEPT
{
return "future";
}
std::string
future_error_category::message(int ev) const
{
switch (BOOST_SCOPED_ENUM_NATIVE(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");
}
future_error_category future_error_category_var;
}
BOOST_THREAD_DECL
const system::error_category&
future_category() BOOST_NOEXCEPT
{
return thread_detail::future_error_category_var;
}
}
#endif