amorfo77/json
1
0
Fork 0
mirror of https://github.com/nlohmann/json.git synced 2026-08-08 10:13:20 +00:00
Code Issues Packages Projects Releases Wiki Activity

fix: leave the character that terminates a number in the input

Browse Source 
Read the character following a number without consuming it, instead of
consuming it and putting it back. input_stream_adapter now peeks with
sgetc() and only steps over the character when the next one is requested
or when the adapter is destroyed, so releasing it cannot fail - no
putback position is required from the streambuf.

Suggested by gregmarr in #5344.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-08-04 14:39:05 +02:00
parent e4aaf46d38
commit c021a09b08
6 changed files with 184 additions and 119 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/mkdocs/docs/api/operator_gtgt.md
+2 -5
View File
@@ -51,11 +51,8 @@ input >> j3; // j3 == [2]
number was immediately followed by another value: reading `1true` yielded `1` and left the stream at `rue`.
Values had to be separated by whitespace to work around this.
The terminating character is now returned to the stream, so no separator is required. Code that relied on the
extra byte being swallowed will observe it again.
If the stream's `#!cpp std::streambuf` cannot put the character back (its `pbackfail` fails, which does not happen
for `#!cpp std::stringbuf` or `#!cpp std::filebuf`), the character is lost as before.
The terminating character is now only looked at and left in the stream, so no separator is required. Code that
relied on the extra byte being swallowed will observe it again.
Note that reading concatenated values does **not** work for [JSON Lines](../features/parsing/json_lines.md)
(newline-delimited JSON) input -- see that page for why and for the recommended alternative.