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Describe comparison in the no-thread-local docs and CI target

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Comparing two values now bounds its descent with a thread_local counter
just as copying does, so the JSON_NO_THREAD_LOCAL page, the macro
overview and the ci_test_no_thread_local target cover both rather than
copying alone.

Also record what switching the macro on costs a comparison: on the
benchmark documents, comparing two equal values takes 10% to 90% longer.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-08-21 12:25:05 +02:00
parent e8b9ec8ff8
commit 0e9754d772
3 changed files with 16 additions and 15 deletions
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cmake/ci.cmake
+4 -4
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@@ -246,10 +246,10 @@ add_custom_target(ci_test_noglobaludls
# Disable thread-local storage.
###############################################################################
# Without thread-local storage, the copy constructor cannot bound its descent
# and copies every object and array without the call stack. That path is
# otherwise only reached by values nested deeper than the bound, so this target
# is what runs the whole test suite through it.
# Without thread-local storage, copying and comparing cannot bound their
# descent and handle every object and array without the call stack. Those paths
# are otherwise only reached by values nested deeper than the bound, so this
# target is what runs the whole test suite through them.
add_custom_target(ci_test_no_thread_local
COMMAND ${CMAKE_COMMAND}
-DCMAKE_BUILD_TYPE=Debug -GNinja