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Niels Lohmann
1841b4f671
write_bjdata_ndarray() built a 12-entry std::map<string_t, CharType> on
every call just to translate the _ArrayType_ name to a dtype marker
(the only reason binary_writer.hpp included <map>), then mapped dtype
to C++ type twice more: once as a switch for the range-check pass and
once as a separate if/else chain for the write pass, with nothing
checking that the two agreed. The caller also ran three at() lookups,
and the callee called value.at(key) about ten more times for the same
three members.
Replace the map with bjdata_ndarray_type_marker(), a plain string
comparison chain (a C++11 constexpr function cannot contain a switch,
so this mirrors binary_reader's own static table style). Replace the
switch/if-chain pair with one write_bjdata_ndarray_elements() that
switches on dtype once and calls a per-type helper -
write_bjdata_ndarray_element<T>() for the eight integer dtypes and
write_bjdata_ndarray_float_element() for 'd' - with a dry_run flag
selecting the range check or the actual write, so the two passes can
no longer disagree on the type. _ArrayType_, _ArraySize_ and
_ArrayData_ are now looked up once into references, and the four
header marker bytes ('[', '$', '#') are written through to_char_type()
like the rest of the UBJSON/BJData writer.
The 'd' (single-precision) rule is left exactly as before, since #5707
is expected to change it separately.
Verified byte-for-byte identical output before/after for every dtype
(including the Draft 2/Draft 3 'byte' fallback and the use_count/
use_type combinations) via a standalone probe, plus round-tripping
through from_bjdata().
Overlaps #5707, which is expected to touch the 'd' dtype case, and
#5518, which is expected to move the write_bjdata_ndarray() call site.
#5710 item 4
Signed-off-by: Niels Lohmann <mail@nlohmann.me>