Fix FMT_COMPILE failure with format_as mapped types (Issue #4794)#4836
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upadhyay74aman wants to merge 3 commits into
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Fix FMT_COMPILE failure with format_as mapped types (Issue #4794)#4836upadhyay74aman wants to merge 3 commits into
upadhyay74aman wants to merge 3 commits into
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phprus
reviewed
Jul 5, 2026
vitaut
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Jul 5, 2026
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This PR fixes an issue where
FMT_COMPILEfails to compile when used with user-defined types formatted viaformat_as.The Changes:
Introduced
compile_has_format_asto check forformat_asoverloads at compile time via ADL.Updated the
formatmethod insidedetail::fieldincompile.hto branch usingif constexpr, casting the argument viaformat_asif the type supports it.Added a regression test to
test/compile-test.ccto ensure compile-timeformat_asevaluation works as expected.Closes #4794