std::pmr support

[Clinkz24]

May I ask, is support for std::pmr available now? If not, is there any plan to support it in the future?

[nlohmann]

You can change the types in the basic_json template:

using pmr_string = std::pmr::string;

template <class T>
using pmr_vector = std::pmr::vector<T>;

template <class K, class V, class Cmp = std::less<K>>
using pmr_map = std::pmr::map<K, V, Cmp>;

using pmr_json = nlohmann::basic_json<
    pmr_map,                      // object container template
    pmr_vector,                   // array container template
    pmr_string,                   // string type
    bool,                         // boolean
    std::int64_t,                 // signed integer
    std::uint64_t,                // unsigned integer
    double,                       // floating point
    std::pmr::polymorphic_allocator // allocator template (used by containers/strings)
>;

This is untested though. Would be great if you could share your experience.