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// Copyright (C) 2016 Canonical Ltd.
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// This library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef ICHNAEA_RESPONSE_H_
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#define ICHNAEA_RESPONSE_H_
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#include <ichnaea/error.h>
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#include <boost/variant.hpp>
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#include <type_traits>
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/// @brief Repsonse models a typed variant that either contains the Result of
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/// an operation xor an error if the operation fails.
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template<typename Result>
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/// @brief NotAnError is thrown if error() is invoked on a Response<T>
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/// instance that contains a result.
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struct NotAnError : public std::runtime_error
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NotAnError() : std::runtime_error{"Not an error"}
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/// @brief Response initializes a new instance with result such
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/// that subsequent invocations of is_error() return false.
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explicit Response(const Result& result)
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: result_or_error{result}
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/// @brief Response initializes a new instance with error such
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/// that subsequent invocations of is_error() return true.
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explicit Response(const Error& error)
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: result_or_error{error}
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/// @brief is_error returns true if the instance contains an error.
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return 1 == result_or_error.which();
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/// @brief error returns the error response or throws NotAnError
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/// if no error is contained in the instance.
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const Error& error() const
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return boost::get<Error>(result_or_error);
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/// @brief result returns the Result instance. Throws the contained
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/// error if this is an error response.
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const Result& result() const
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return boost::get<Result>(result_or_error);
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boost::variant<Result, Error> result_or_error;
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#endif // ICHNAEA_RESPONSE_H_
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3rd-party/ichnaea/include/ichnaea/response.h
