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65 lines
2.7 KiB
65 lines
2.7 KiB
// Copyright (c) 2022, The Monero Project
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <boost/variant/variant.hpp>
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#include <cstddef>
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#include <cstdint>
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#include <string>
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#include "serialization/wire/fwd.h"
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namespace wire
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{
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/*! Can hold any non-recursive value. Implements optional field concept
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requirements. If used in a `optional_field`, the `nullptr` type/value
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determines whether the field name is omitted or present in an object. If used
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in a `field` (required), the field name is always present in the object, and
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the value could be `null`/`nil`. */
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struct basic_value
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{
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using variant_type =
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boost::variant<std::nullptr_t, bool, std::uintmax_t, std::intmax_t, double, std::string>;
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variant_type value;
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// concept requirements for optional fields
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explicit operator bool() const noexcept { return value != variant_type{nullptr}; }
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basic_value& emplace() noexcept { return *this; }
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basic_value& operator*() noexcept { return *this; }
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const basic_value& operator*() const noexcept { return *this; }
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void reset();
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};
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void read_bytes(reader& source, basic_value& dest);
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void write_bytes(writer& dest, const basic_value& source);
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} // wire
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