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nlohmann committed 2026-11-10 06:10:03 +00:00
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api/macros/json_disable_stream_bulk_scan.md
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@@ -48,8 +48,8 @@ The default value is `0`: streams are scanned in bulk.
!!! note "Performance"
Parsing from a `std::ifstream` or `std::istringstream` is typically 1.5 to 2 times as fast as before, and reading
many small values from one stream with `operator>>` 1.4 to 4 times as fast. Parsing from a stream is then within
about 10 to 20 % of first reading the whole file into a `std::string` and parsing that.
many small values from one stream with `operator>>` 1.4 to 4 times as fast. Parsing from a stream then takes about
1.15 to 1.45 times as long as first reading the whole file into a `std::string` and parsing that.
A stream buffer without a get area (one that only overrides `underflow()` and `uflow()` and hands out every
character from there) offers nothing to scan in bulk, so it is read one character at a time as before.