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| #pragma once | ||
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| #include <cstddef> // size_t, uint8_t | ||
| #include <functional> // hash | ||
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| namespace nlohmann | ||
| { | ||
| namespace detail | ||
| { | ||
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| // boost::hash_combine | ||
| std::size_t combine(std::size_t seed, std::size_t h) noexcept | ||
| { | ||
| seed ^= h + 0x9e3779b9 + (seed << 6U) + (seed >> 2U); | ||
| return seed; | ||
| } | ||
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| /*! | ||
| @brief hash a JSON value | ||
| The hash function tries to rely on std::hash where possible. Furthermore, the | ||
| type of the JSON value is taken into account to have different hash values for | ||
| null, 0, 0U, and false, etc. | ||
| @tparam BasicJsonType basic_json specialization | ||
| @param j JSON value to hash | ||
| @return hash value of j | ||
| */ | ||
| template<typename BasicJsonType> | ||
| std::size_t hash(const BasicJsonType& j) | ||
| { | ||
| using string_t = typename BasicJsonType::string_t; | ||
| using number_integer_t = typename BasicJsonType::number_integer_t; | ||
| using number_unsigned_t = typename BasicJsonType::number_unsigned_t; | ||
| using number_float_t = typename BasicJsonType::number_float_t; | ||
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| const auto type = static_cast<std::size_t>(j.type()); | ||
| switch (j.type()) | ||
| { | ||
| case BasicJsonType::value_t::null: | ||
| case BasicJsonType::value_t::discarded: | ||
| { | ||
| return combine(type, 0); | ||
| } | ||
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| case BasicJsonType::value_t::object: | ||
| { | ||
| auto seed = combine(type, j.size()); | ||
| for (const auto& element : j.items()) | ||
| { | ||
| const auto h = std::hash<string_t> {}(element.key()); | ||
| seed = combine(seed, h); | ||
| seed = combine(seed, hash(element.value())); | ||
| } | ||
| return seed; | ||
| } | ||
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| case BasicJsonType::value_t::array: | ||
| { | ||
| auto seed = combine(type, j.size()); | ||
| for (const auto& element : j) | ||
| { | ||
| seed = combine(seed, hash(element)); | ||
| } | ||
| return seed; | ||
| } | ||
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| case BasicJsonType::value_t::string: | ||
| { | ||
| const auto h = std::hash<string_t> {}(j.template get_ref<const string_t&>()); | ||
| return combine(type, h); | ||
| } | ||
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| case BasicJsonType::value_t::boolean: | ||
| { | ||
| const auto h = std::hash<bool> {}(j.template get<bool>()); | ||
| return combine(type, h); | ||
| } | ||
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| case BasicJsonType::value_t::number_integer: | ||
| { | ||
| const auto h = std::hash<number_integer_t> {}(j.template get<number_integer_t>()); | ||
| return combine(type, h); | ||
| } | ||
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| case nlohmann::detail::value_t::number_unsigned: | ||
| { | ||
| const auto h = std::hash<number_unsigned_t> {}(j.template get<number_unsigned_t>()); | ||
| return combine(type, h); | ||
| } | ||
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| case nlohmann::detail::value_t::number_float: | ||
| { | ||
| const auto h = std::hash<number_float_t> {}(j.template get<number_float_t>()); | ||
| return combine(type, h); | ||
| } | ||
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| case nlohmann::detail::value_t::binary: | ||
| { | ||
| auto seed = combine(type, j.get_binary().size()); | ||
| const auto h = std::hash<bool> {}(j.get_binary().has_subtype()); | ||
| seed = combine(seed, h); | ||
| seed = combine(seed, j.get_binary().subtype()); | ||
| for (const auto byte : j.get_binary()) | ||
| { | ||
| seed = combine(seed, std::hash<std::uint8_t> {}(byte)); | ||
| } | ||
| return seed; | ||
| } | ||
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| default: // LCOV_EXCL_LINE | ||
| JSON_ASSERT(false); // LCOV_EXCL_LINE | ||
| } | ||
| } | ||
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| } // namespace detail | ||
| } // namespace nlohmann |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,84 @@ | ||
| /* | ||
| __ _____ _____ _____ | ||
| __| | __| | | | JSON for Modern C++ (test suite) | ||
| | | |__ | | | | | | version 3.8.0 | ||
| |_____|_____|_____|_|___| https://github.com/nlohmann/json | ||
| Licensed under the MIT License <http://opensource.org/licenses/MIT>. | ||
| SPDX-License-Identifier: MIT | ||
| Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>. | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
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| #include "doctest_compatibility.h" | ||
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| #include <nlohmann/json.hpp> | ||
| using json = nlohmann::json; | ||
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| #include <set> | ||
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| TEST_CASE("hash") | ||
| { | ||
| // Collect hashes for different JSON values and make sure that they are distinct | ||
| // We cannot compare against fixed values, because the implementation of | ||
| // std::hash may differ between compilers. | ||
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| std::set<std::size_t> hashes; | ||
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| // null | ||
| hashes.insert(std::hash<json> {}(json(nullptr))); | ||
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| // boolean | ||
| hashes.insert(std::hash<json> {}(json(true))); | ||
| hashes.insert(std::hash<json> {}(json(false))); | ||
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| // string | ||
| hashes.insert(std::hash<json> {}(json(""))); | ||
| hashes.insert(std::hash<json> {}(json("foo"))); | ||
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| // number | ||
| hashes.insert(std::hash<json> {}(json(0))); | ||
| hashes.insert(std::hash<json> {}(json(unsigned(0)))); | ||
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| hashes.insert(std::hash<json> {}(json(-1))); | ||
| hashes.insert(std::hash<json> {}(json(0.0))); | ||
| hashes.insert(std::hash<json> {}(json(42.23))); | ||
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| // array | ||
| hashes.insert(std::hash<json> {}(json::array())); | ||
| hashes.insert(std::hash<json> {}(json::array({1, 2, 3}))); | ||
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| // object | ||
| hashes.insert(std::hash<json> {}(json::object())); | ||
| hashes.insert(std::hash<json> {}(json::object({{"foo", "bar"}}))); | ||
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| // binary | ||
| hashes.insert(std::hash<json> {}(json::binary({}))); | ||
| hashes.insert(std::hash<json> {}(json::binary({}, 0))); | ||
| hashes.insert(std::hash<json> {}(json::binary({}, 42))); | ||
| hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}))); | ||
| hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 0))); | ||
| hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 42))); | ||
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| // discarded | ||
| hashes.insert(std::hash<json> {}(json(json::value_t::discarded))); | ||
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| CHECK(hashes.size() == 21); | ||
| } |