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Niels Lohmann
ca47dd539d
Listing std::pmr::string as fully supported was an overclaim: it was only ever checked with the default memory resource, which is not what PMR is for. basic_json cannot be given an allocator or a memory resource, so a pmr string inside a value always allocates from std::pmr::get_default_resource(), and assigning an arena-backed string into a value silently drops its resource, because polymorphic_allocator does not propagate on copy construction. Passing polymorphic_allocator as AllocatorType does not compile either. Only the process-global set_default_resource() redirects these allocations. Say so, and separate the row from std::basic_string with a custom stateless allocator, which is unaffected. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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