allow forward declaration of has_ traits

[grisumbras]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://1142.json.prtest2.cppalliance.org/libs/json/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-02-06 19:03:03 UTC

[cppalliance-bot]

GCOVR code coverage report https://1142.json.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://1142.json.prtest2.cppalliance.org/genhtml/index.html
Coverage Diff Report https://1142.json.prtest2.cppalliance.org/diff-report/index.html

Build time: 2026-02-06 19:21:28 UTC

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/1142/pullrequest.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.67%. Comparing base (6238e35) to head (fe6fc5e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1142   +/-   ##
========================================
  Coverage    93.67%   93.67%           
========================================
  Files           91       91           
  Lines         9153     9153           
========================================
  Hits          8574     8574           
  Misses         579      579           

Files with missing lines	Coverage Δ
include/boost/json/value_from.hpp	100.00% <ø> (ø)
include/boost/json/value_to.hpp	100.00% <ø> (ø)

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[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/1142/pullrequest.html