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Niels Lohmann
4001fe68b9
Two bugs for custom number types that compile on develop (found while analysing #3578): - compare_integer_with_float() took the signedness of the integer type from std::is_signed, which is false for class types such as absl::int128 or boost::multiprecision::cpp_int. Any float below zero then compared less than every integer, e.g. json(int128(-5)) < json(-2.5) was false. The signedness now comes from std::numeric_limits, like the digits used for the range bound. - With number_integer_t/number_unsigned_t wider than 64 bits (e.g. __int128), CBOR, MessagePack, and BSON silently truncated integers beyond 64 bits (to_cbor of 2^100 read back as 0), BJData truncated unsigned ones with the 'M' marker and could encode truncated ND-array elements and dimensions, and BON8 did not compile (std::to_string is ambiguous for __int128). The writers now throw out_of_range.407 when an integer does not fit the format's range ([-2^64, 2^64-1] for CBOR, [-2^63, 2^64-1] for MessagePack, int64/uint64 for BSON, int64 for BON8); BJData writes such unsigned values as high-precision numbers, as it already did for signed ones and UBJSON does for both, and falls back to a plain object for the ND-array. The checks use std::numeric_limits digits and compile away when the number types are at most 64 bits wide, so the default types pay nothing (the CBOR, MessagePack, and BSON writers compile to identical code). The new unit-custom-number-types.cpp tests the comparison with a small class-type integer and the writers with __int128 where the standard library supports it as an integral type. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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