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refactor is_compatible_integer_type

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This commit is contained in:
Théo DELRIEU 2018-09-05 16:56:45 +02:00
parent 13760857ff
commit 77967e6548
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2 changed files with 26 additions and 24 deletions
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25
include/nlohmann/detail/meta/type_traits.hpp
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@ -137,31 +137,32 @@ template <typename BasicJsonType, typename CompatibleArrayType>
struct is_compatible_array_type
: is_compatible_array_type_impl<BasicJsonType, CompatibleArrayType> {};
template<bool, typename, typename>
template <typename RealIntegerType, typename CompatibleNumberIntegerType,
typename = void>
struct is_compatible_integer_type_impl : std::false_type {};
template<typename RealIntegerType, typename CompatibleNumberIntegerType>
struct is_compatible_integer_type_impl<true, RealIntegerType, CompatibleNumberIntegerType>
template <typename RealIntegerType, typename CompatibleNumberIntegerType>
struct is_compatible_integer_type_impl <
RealIntegerType, CompatibleNumberIntegerType,
enable_if_t<std::is_integral<RealIntegerType>::value and
std::is_integral<CompatibleNumberIntegerType>::value and
not std::is_same<bool, CompatibleNumberIntegerType>::value >>
{
// is there an assert somewhere on overflows?
using RealLimits = std::numeric_limits<RealIntegerType>;
using CompatibleLimits = std::numeric_limits<CompatibleNumberIntegerType>;
static constexpr auto value =
std::is_constructible<RealIntegerType, CompatibleNumberIntegerType>::value and
std::is_constructible<RealIntegerType,
CompatibleNumberIntegerType>::value and
CompatibleLimits::is_integer and
RealLimits::is_signed == CompatibleLimits::is_signed;
};
template<typename RealIntegerType, typename CompatibleNumberIntegerType>
template <typename RealIntegerType, typename CompatibleNumberIntegerType>
struct is_compatible_integer_type
{
static constexpr auto value =
is_compatible_integer_type_impl <
std::is_integral<CompatibleNumberIntegerType>::value and
not std::is_same<bool, CompatibleNumberIntegerType>::value,
RealIntegerType, CompatibleNumberIntegerType > ::value;
};
: is_compatible_integer_type_impl<RealIntegerType,
CompatibleNumberIntegerType> {};
// trait checking if JSONSerializer<T>::from_json(json const&, udt&) exists
template<typename BasicJsonType, typename T>