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💚 add test cases for hash

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This commit is contained in:
Niels Lohmann
2020-07-15 09:27:01 +02:00
parent 33b0bed7fe
commit 9449dfcc6a
5 changed files with 124 additions and 16 deletions
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24
single_include/nlohmann/json.hpp
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@ -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