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💚 add test cases for hash

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Niels Lohmann 2020-07-15 09:27:01 +02:00
parent 33b0bed7fe
commit 9449dfcc6a
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GPG key ID: 7F3CEA63AE251B69
5 changed files with 124 additions and 16 deletions
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24
include/nlohmann/detail/hash.hpp
View file

@ -8,7 +8,7 @@ namespace nlohmann
namespace detail
{
std::size_t combine(std::size_t seed, std::size_t h)
std::size_t combine(std::size_t seed, std::size_t h) noexcept
{
seed ^= h + 0x9e3779b9 + (seed << 6U) + (seed >> 2U);
return seed;
@ -17,6 +17,11 @@ std::size_t combine(std::size_t seed, std::size_t h)
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;
switch (j.type())
{
case BasicJsonType::value_t::null:
@ -28,7 +33,7 @@ std::size_t hash(const BasicJsonType& j)
auto seed = combine(static_cast<std::size_t>(j.type()), j.size());
for (const auto& element : j.items())
{
const auto h = std::hash<typename BasicJsonType::string_t> {}(element.key());
const auto h = std::hash<string_t> {}(element.key());
seed = combine(seed, h);
seed = combine(seed, hash(element.value()));
}
@ -47,7 +52,7 @@ std::size_t hash(const BasicJsonType& j)
case BasicJsonType::value_t::string:
{
const auto h = std::hash<typename BasicJsonType::string_t> {}(j.template get_ref<const typename BasicJsonType::string_t&>());
const auto h = std::hash<string_t> {}(j.template get_ref<const string_t&>());
return combine(static_cast<std::size_t>(j.type()), h);
}
@ -59,25 +64,27 @@ std::size_t hash(const BasicJsonType& j)
case BasicJsonType::value_t::number_integer:
{
const auto h = std::hash<typename BasicJsonType::number_integer_t> {}(j.template get<typename BasicJsonType::number_integer_t>());
const auto h = std::hash<number_integer_t> {}(j.template get<number_integer_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::number_unsigned:
{
const auto h = std::hash<typename BasicJsonType::number_unsigned_t> {}(j.template get<typename BasicJsonType::number_unsigned_t>());
const auto h = std::hash<number_unsigned_t> {}(j.template get<number_unsigned_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::number_float:
{
const auto h = std::hash<typename BasicJsonType::number_float_t> {}(j.template get<typename BasicJsonType::number_float_t>());
const auto h = std::hash<number_float_t> {}(j.template get<number_float_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::binary:
{
auto seed = combine(static_cast<std::size_t>(j.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())
{
@ -85,9 +92,10 @@ std::size_t hash(const BasicJsonType& j)
}
return seed;
}
}
return 0;
default: // LCOV_EXCL_LINE
JSON_ASSERT(false); // LCOV_EXCL_LINE
}
}
} // namespace detail

24
single_include/nlohmann/json.hpp
View file

@ -4453,7 +4453,7 @@ namespace nlohmann
namespace detail
{
std::size_t combine(std::size_t seed, std::size_t h)
std::size_t combine(std::size_t seed, std::size_t h) noexcept
{
seed ^= h + 0x9e3779b9 + (seed << 6U) + (seed >> 2U);
return seed;
@ -4462,6 +4462,11 @@ std::size_t combine(std::size_t seed, std::size_t h)
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;
switch (j.type())
{
case BasicJsonType::value_t::null:
@ -4473,7 +4478,7 @@ std::size_t hash(const BasicJsonType& j)
auto seed = combine(static_cast<std::size_t>(j.type()), j.size());
for (const auto& element : j.items())
{
const auto h = std::hash<typename BasicJsonType::string_t> {}(element.key());
const auto h = std::hash<string_t> {}(element.key());
seed = combine(seed, h);
seed = combine(seed, hash(element.value()));
}
@ -4492,7 +4497,7 @@ std::size_t hash(const BasicJsonType& j)
case BasicJsonType::value_t::string:
{
const auto h = std::hash<typename BasicJsonType::string_t> {}(j.template get_ref<const typename BasicJsonType::string_t&>());
const auto h = std::hash<string_t> {}(j.template get_ref<const string_t&>());
return combine(static_cast<std::size_t>(j.type()), h);
}
@ -4504,25 +4509,27 @@ std::size_t hash(const BasicJsonType& j)
case BasicJsonType::value_t::number_integer:
{
const auto h = std::hash<typename BasicJsonType::number_integer_t> {}(j.template get<typename BasicJsonType::number_integer_t>());
const auto h = std::hash<number_integer_t> {}(j.template get<number_integer_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::number_unsigned:
{
const auto h = std::hash<typename BasicJsonType::number_unsigned_t> {}(j.template get<typename BasicJsonType::number_unsigned_t>());
const auto h = std::hash<number_unsigned_t> {}(j.template get<number_unsigned_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::number_float:
{
const auto h = std::hash<typename BasicJsonType::number_float_t> {}(j.template get<typename BasicJsonType::number_float_t>());
const auto h = std::hash<number_float_t> {}(j.template get<number_float_t>());
return combine(static_cast<std::size_t>(j.type()), h);
}
case nlohmann::detail::value_t::binary:
{
auto seed = combine(static_cast<std::size_t>(j.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())
{
@ -4530,9 +4537,10 @@ std::size_t hash(const BasicJsonType& j)
}
return seed;
}
}
return 0;
default: // LCOV_EXCL_LINE
JSON_ASSERT(false); // LCOV_EXCL_LINE
}
}
} // namespace detail

1
test/CMakeLists.txt
View file

@ -112,6 +112,7 @@ set(files
src/unit-deserialization.cpp
src/unit-element_access1.cpp
src/unit-element_access2.cpp
src/unit-hash.cpp
src/unit-inspection.cpp
src/unit-items.cpp
src/unit-iterators1.cpp

1
test/Makefile
View file

@ -10,6 +10,7 @@ SOURCES = src/unit.cpp \
src/unit-algorithms.cpp \
src/unit-allocator.cpp \
src/unit-alt-string.cpp \
src/unit-assert_macro.cpp \
src/unit-bson.cpp \
src/unit-capacity.cpp \
src/unit-cbor.cpp \

90
test/src/unit-hash.cpp Normal file
View file

@ -0,0 +1,90 @@
/*
__ _____ _____ _____
__| | __| | | | 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.
*/
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
using json = nlohmann::json;
TEST_CASE("hash")
{
SECTION("null")
{
CHECK(std::hash<json> {}(json(nullptr)) == 2654435769U);
}
SECTION("boolean")
{
CHECK(std::hash<json> {}(json(true)) == 2654436031U);
CHECK(std::hash<json> {}(json(false)) == 2654436030U);
}
SECTION("string")
{
CHECK(std::hash<json> {}(json("")) == 11160318156688833227U);
CHECK(std::hash<json> {}(json("foo")) == 910203211069189493U);
}
SECTION("number")
{
CHECK(std::hash<json> {}(json(int(0))) == 2654436095U);
CHECK(std::hash<json> {}(json(unsigned(0))) == 2654436156U);
CHECK(std::hash<json> {}(json(-1)) == 2654436092U);
CHECK(std::hash<json> {}(json(0.0)) == 2654436221U);
CHECK(std::hash<json> {}(json(42.23)) == 4631140164097181104U);
}
SECTION("array")
{
CHECK(std::hash<json> {}(json::array()) == 2654435899U);
CHECK(std::hash<json> {}(json::array({1, 2, 3})) == 717272658337467U);
}
SECTION("object")
{
CHECK(std::hash<json> {}(json::object()) == 2654435832U);
CHECK(std::hash<json> {}(json::object({{"foo", "bar"}})) == 4042265434648078139U);
}
SECTION("binary")
{
CHECK(std::hash<json> {}(json::binary({})) == 11093832941624U);
CHECK(std::hash<json> {}(json::binary({}, 0)) == 11093832941691U);
CHECK(std::hash<json> {}(json::binary({}, 42)) == 11093832941581U);
CHECK(std::hash<json> {}(json::binary({1, 2, 3})) == 3005324138949694928U);
CHECK(std::hash<json> {}(json::binary({1, 2, 3}, 0)) == 3005324138988516582U);
CHECK(std::hash<json> {}(json::binary({1, 2, 3}, 42)) == 3005324138986241627U);
}
SECTION("discarded")
{
CHECK(std::hash<json> {}(json(json::value_t::discarded)) == 2654436338U);
}
}