UPSTREAM PR #2024: Fix ambiguous FormatConvertImpl when type has both AbslStringify and AbslFormatConvert - #13
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…AbslFormatConvert When a type defines both AbslStringify and AbslFormatConvert, FormatConvertImpl overload resolution was ambiguous, causing a compilation error. Fix by giving AbslStringify priority over AbslFormatConvert when both are defined, consistent with the intended use of AbslStringify as the preferred extension mechanism. Fixes #1966
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Source pull request: abseil/abseil-cpp#2024
When a type defines both
AbslStringifyandAbslFormatConvert, callingabsl::StrFormat("%v", value)caused a compilation error due to ambiguous overload resolution inFormatConvertImpl.This fix gives
AbslStringifypriority overAbslFormatConvertwhen both are defined, by:!HasAbslStringify<T>::valueguard to theAbslFormatConvertoverload ofFormatConvertImplArgumentToConv()to returnvconversion char set when both methods are presentA test is added to verify that
AbslStringifyis called when both methods are defined.Fixes #1966