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Add value_in_range_of trait

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Florian Albrechtskirchinger 2022-06-08 08:50:54 +02:00
parent b2bbd2b1c8
commit 329e1871f7
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GPG Key ID: 19618CE9B2D4BE6D
3 changed files with 299 additions and 0 deletions
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95
include/nlohmann/detail/meta/type_traits.hpp
View File

@ -577,5 +577,100 @@ T conditional_static_cast(U value)
return value; return value;
} }
template<typename... Types>
using all_integral = conjunction<std::is_integral<Types>...>;
template<typename... Types>
using all_signed = conjunction<std::is_signed<Types>...>;
template<typename... Types>
using all_unsigned = conjunction<std::is_unsigned<Types>...>;
// there's a disjunction trait in another PR; replace when merged
template<typename... Types>
using same_sign = std::integral_constant < bool,
all_signed<Types...>::value || all_unsigned<Types...>::value >;
template<typename OfType, typename T>
using never_out_of_range = std::integral_constant < bool,
(std::is_signed<OfType>::value && (sizeof(T) < sizeof(OfType)))
|| (same_sign<OfType, T>::value && sizeof(OfType) == sizeof(T)) >;
template<typename OfType, typename T,
bool OfTypeSigned = std::is_signed<OfType>::value,
bool TSigned = std::is_signed<T>::value>
struct value_in_range_of_impl2;
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, false, false>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, true, false>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, false, true>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return val >= 0 && static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, true, true>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) >= static_cast<CommonType>(std::numeric_limits<OfType>::min())
&& static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T,
bool NeverOutOfRange = never_out_of_range<OfType, T>::value,
typename = detail::enable_if_t<all_integral<OfType, T>::value>>
struct value_in_range_of_impl1;
template<typename OfType, typename T>
struct value_in_range_of_impl1<OfType, T, false>
{
static constexpr bool test(T val)
{
return value_in_range_of_impl2<OfType, T>::test(val);
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl1<OfType, T, true>
{
static constexpr bool test(T /*val*/)
{
return true;
}
};
template<typename OfType, typename T>
inline constexpr bool value_in_range_of(T val)
{
return value_in_range_of_impl1<OfType, T>::test(val);
}
} // namespace detail } // namespace detail
} // namespace nlohmann } // namespace nlohmann

95
single_include/nlohmann/json.hpp
View File

@ -3768,6 +3768,101 @@ T conditional_static_cast(U value)
return value; return value;
} }
template<typename... Types>
using all_integral = conjunction<std::is_integral<Types>...>;
template<typename... Types>
using all_signed = conjunction<std::is_signed<Types>...>;
template<typename... Types>
using all_unsigned = conjunction<std::is_unsigned<Types>...>;
// there's a disjunction trait in another PR; replace when merged
template<typename... Types>
using same_sign = std::integral_constant < bool,
all_signed<Types...>::value || all_unsigned<Types...>::value >;
template<typename OfType, typename T>
using never_out_of_range = std::integral_constant < bool,
(std::is_signed<OfType>::value && (sizeof(T) < sizeof(OfType)))
|| (same_sign<OfType, T>::value && sizeof(OfType) == sizeof(T)) >;
template<typename OfType, typename T,
bool OfTypeSigned = std::is_signed<OfType>::value,
bool TSigned = std::is_signed<T>::value>
struct value_in_range_of_impl2;
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, false, false>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, true, false>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, false, true>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return val >= 0 && static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl2<OfType, T, true, true>
{
static constexpr bool test(T val)
{
using CommonType = typename std::common_type<OfType, T>::type;
return static_cast<CommonType>(val) >= static_cast<CommonType>(std::numeric_limits<OfType>::min())
&& static_cast<CommonType>(val) <= static_cast<CommonType>(std::numeric_limits<OfType>::max());
}
};
template<typename OfType, typename T,
bool NeverOutOfRange = never_out_of_range<OfType, T>::value,
typename = detail::enable_if_t<all_integral<OfType, T>::value>>
struct value_in_range_of_impl1;
template<typename OfType, typename T>
struct value_in_range_of_impl1<OfType, T, false>
{
static constexpr bool test(T val)
{
return value_in_range_of_impl2<OfType, T>::test(val);
}
};
template<typename OfType, typename T>
struct value_in_range_of_impl1<OfType, T, true>
{
static constexpr bool test(T /*val*/)
{
return true;
}
};
template<typename OfType, typename T>
inline constexpr bool value_in_range_of(T val)
{
return value_in_range_of_impl1<OfType, T>::test(val);
}
} // namespace detail } // namespace detail
} // namespace nlohmann } // namespace nlohmann

109
tests/src/unit-bjdata.cpp
View File

@ -29,6 +29,8 @@ SOFTWARE.
#include "doctest_compatibility.h" #include "doctest_compatibility.h"
#include <climits>
#include <limits>
#include <nlohmann/json.hpp> #include <nlohmann/json.hpp>
using nlohmann::json; using nlohmann::json;
@ -116,6 +118,113 @@ class SaxCountdown
}; };
} // namespace } // namespace
// at some point in the future, a unit test dedicated to type traits might be a good idea
template <typename OfType, typename T, bool MinInRange, bool MaxInRange>
struct trait_test_arg
{
using of_type = OfType;
using type = T;
static constexpr bool min_in_range = MinInRange;
static constexpr bool max_in_range = MaxInRange;
};
TEST_CASE_TEMPLATE_DEFINE("value_in_range_of trait", T, value_in_range_of_test)
{
//using namespace nlohmann::detail; // NOLINT(google-build-using-namespace)
using nlohmann::detail::value_in_range_of;
using of_type = typename T::of_type;
using type = typename T::type;
constexpr bool min_in_range = T::min_in_range;
constexpr bool max_in_range = T::max_in_range;
type val_min = std::numeric_limits<type>::min();
type val_min2 = val_min + 1;
type val_max = std::numeric_limits<type>::max();
type val_max2 = val_max - 1;
REQUIRE(CHAR_BIT == 8);
std::string of_type_str;
if (std::is_unsigned<of_type>::value)
{
of_type_str += "u";
}
of_type_str += "int";
of_type_str += std::to_string(sizeof(of_type) * 8);
INFO("of_type := ", of_type_str);
std::string type_str;
if (std::is_unsigned<type>::value)
{
type_str += "u";
}
type_str += "int";
type_str += std::to_string(sizeof(type) * 8);
INFO("type := ", type_str);
CAPTURE(val_min);
CAPTURE(min_in_range);
CAPTURE(val_max);
CAPTURE(max_in_range);
if (min_in_range)
{
CHECK(value_in_range_of<of_type>(val_min));
CHECK(value_in_range_of<of_type>(val_min2));
}
else
{
CHECK_FALSE(value_in_range_of<of_type>(val_min));
CHECK_FALSE(value_in_range_of<of_type>(val_min2));
}
if (max_in_range)
{
CHECK(value_in_range_of<of_type>(val_max));
CHECK(value_in_range_of<of_type>(val_max2));
}
else
{
CHECK_FALSE(value_in_range_of<of_type>(val_max));
CHECK_FALSE(value_in_range_of<of_type>(val_max2));
}
}
TEST_CASE_TEMPLATE_INVOKE(value_in_range_of_test, \
trait_test_arg<std::int32_t, std::int32_t, true, true>, \
trait_test_arg<std::int32_t, std::uint32_t, true, false>, \
trait_test_arg<std::uint32_t, std::int32_t, false, true>, \
trait_test_arg<std::uint32_t, std::uint32_t, true, true>, \
trait_test_arg<std::int32_t, std::int64_t, false, false>, \
trait_test_arg<std::int32_t, std::uint64_t, true, false>, \
trait_test_arg<std::uint32_t, std::int64_t, false, false>, \
trait_test_arg<std::uint32_t, std::uint64_t, true, false>, \
trait_test_arg<std::int64_t, std::int32_t, true, true>, \
trait_test_arg<std::int64_t, std::uint32_t, true, true>, \
trait_test_arg<std::uint64_t, std::int32_t, false, true>, \
trait_test_arg<std::uint64_t, std::uint32_t, true, true>, \
trait_test_arg<std::int64_t, std::int64_t, true, true>, \
trait_test_arg<std::int64_t, std::uint64_t, true, false>, \
trait_test_arg<std::uint64_t, std::int64_t, false, true>, \
trait_test_arg<std::uint64_t, std::uint64_t, true, true>);
#if SIZE_MAX == 0xffffffff
TEST_CASE_TEMPLATE_INVOKE(value_in_range_of_test, \
trait_test_arg<std::size_t, std::int32_t, false, true>, \
trait_test_arg<std::size_t, std::uint32_t, true, true>, \
trait_test_arg<std::size_t, std::int64_t, false, false>, \
trait_test_arg<std::size_t, std::uint64_t, true, false>);
#else
TEST_CASE_TEMPLATE_INVOKE(value_in_range_of_test, \
trait_test_arg<std::size_t, std::int32_t, false, true>, \
trait_test_arg<std::size_t, std::uint32_t, true, true>, \
trait_test_arg<std::size_t, std::int64_t, false, true>, \
trait_test_arg<std::size_t, std::uint64_t, true, true>);
#endif
TEST_CASE("BJData") TEST_CASE("BJData")
{ {
SECTION("individual values") SECTION("individual values")