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Niels Lohmann
13019f7fe5
An integer token does not need token_buffer: the number_integer and
number_unsigned SAX callbacks take only the value, and the overflow
diagnostic rebuilds the text from the input via get_token_string(). Convert
straight from the input buffer and materialize the token only for the
floating-point tail, which still needs a NUL-terminated buffer for strtod.
JSON_DIAGNOSTIC_POSITIONS derives a number's start position from
get_string().size(), so the copy is kept when that is enabled.
The integer dispatch is factored into convert_integer() and shared with
convert_number(), so both scanners keep using one implementation.
Integer-heavy input, 400k values, -O3:
parse accept
gcc 16 +14% +23%
clang +15% +22%
Signed-off-by: Niels Lohmann <mail@nlohmann.me>