Fix is_formattable for tuple-like types. #2940
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jehelset
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phprus
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Jun 18, 2022
vitaut
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Jun 19, 2022
include/fmt/ranges.h
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| static decltype(check2( | ||
| index_sequence<I...>{}, | ||
| integer_sequence< | ||
| bool, (fmt::is_formattable<typename std::tuple_element<I, T>::type, |
test/ranges-test.cc
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| enum class noformatenum{b}; | ||
| struct noformatstruct{}; |
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Only one unformattable type is needed. Please reuse existing unformattable struct (you might need to move it outside of conditional compilation block).
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Thank you! |
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Fixes #2939.
Added a
is_tuple_formattablehelper value-trait to compute the formattability of the element-types of a tuple. Tried to make it look likeis_tuple_likeandis_tuple_like_.Made the
xchar_test.format_mapconditional. This test formats a map, whose value-type isstd::pair<const std::wstring,int>. Because tuple-likes now also take the formattability of element-types into account, and becauseis_formattable<std::wstring>was false locally, this test no longer compiled. I was surprised that something that is not formattable could be formatted in the first place, and chose flight rather than fight.