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Implement SFINAE friendly iterator_traits and use that instead.

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This commit is contained in:
David Avedissian 2018-11-07 18:39:25 +00:00
parent e3c28afb61
commit f665a92330
5 changed files with 120 additions and 20 deletions
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9
include/nlohmann/detail/meta/type_traits.hpp
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@ -6,6 +6,7 @@
#include <utility> // declval
#include <nlohmann/json_fwd.hpp>
#include <nlohmann/detail/iterators/iterator_traits.hpp>
#include <nlohmann/detail/meta/cpp_future.hpp>
#include <nlohmann/detail/meta/detected.hpp>
#include <nlohmann/detail/macro_scope.hpp>
@ -131,10 +132,10 @@ template <typename T, typename = void>
struct is_iterator_traits : std::false_type {};
template <typename T>
struct is_iterator_traits<std::iterator_traits<T>>
struct is_iterator_traits<iterator_traits<T>>
{
private:
using traits = std::iterator_traits<T>;
using traits = iterator_traits<T>;
public:
static constexpr auto value =
@ -251,7 +252,7 @@ struct is_compatible_array_type_impl <
// Therefore it is detected as a CompatibleArrayType.
// The real fix would be to have an Iterable concept.
not is_iterator_traits<
std::iterator_traits<CompatibleArrayType>>::value >>
iterator_traits<CompatibleArrayType>>::value >>
{
static constexpr bool value =
std::is_constructible<BasicJsonType,
@ -288,7 +289,7 @@ struct is_constructible_array_type_impl <
// Therefore it is detected as a ConstructibleArrayType.
// The real fix would be to have an Iterable concept.
not is_iterator_traits <
std::iterator_traits<ConstructibleArrayType >>::value and
iterator_traits<ConstructibleArrayType >>::value and
(std::is_same<typename ConstructibleArrayType::value_type, typename BasicJsonType::array_t::value_type>::value or
has_from_json<BasicJsonType,