frozen::map of std::variant compilation error

[serge-sans-paille]

frozen::map of std::variant compilation error

[serge-sans-paille]

Can you confirm #82 fixes your issue?

[alex31]

Unfortunately, it's not.

I am afraid that the problem is in std::variant, and we do not have frozen::variant.

error message is :
In file included from /home/alex/DEV/STM32/frozen/include/frozen/map.h:28, from /tmp/testFrozen.cpp:3: /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h: In instantiation of ‘constexpr void frozen::bits::cswap(T&, T&) [with T = std::variant<float, frozen::set<int, 2, std::less<int> > >]’: /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:96:8: required from ‘constexpr void frozen::bits::cswap(std::pair<_T1, _T2>&, std::pair<_T1, _T2>&) [with T = frozen::string; U = std::variant<float, frozen::set<int, 2, std::less<int> > >]’ /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:114:8: required from ‘constexpr Iterator frozen::bits::partition(Iterator, Iterator, const Compare&) [with Iterator = std::pair<frozen::string, std::variant<float, frozen::set<int, 2, std::less<int> > > >*; Compare = frozen::impl::CompareKey<std::less<frozen::string> >]’ /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:128:37: required from ‘constexpr void frozen::bits::quicksort(Iterator, Iterator, const Compare&) [with Iterator = std::pair<frozen::string, std::variant<float, frozen::set<int, 2, std::less<int> > > >*; Compare = frozen::impl::CompareKey<std::less<frozen::string> >]’ /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:138:12: required from here /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:89:5: error: use of deleted function ‘std::variant<_Types>& std::variant<_Types>::operator=(const std::variant<_Types>&) [with _Types = {float, frozen::set<int, 2, std::less<int> >}]’ a = b; ~~^~~ In file included from /tmp/testFrozen.cpp:2: /usr/include/c++/8/variant:1083:16: note: ‘std::variant<_Types>& std::variant<_Types>::operator=(const std::variant<_Types>&) [with _Types = {float, frozen::set<int, 2, std::less<int> >}]’ is implicitly deleted because the default definition would be ill-formed: variant& operator=(const variant&) = default; ^~~~~~~~ /usr/include/c++/8/variant:1083:16: error: use of deleted function ‘std::_Enable_copy_move<true, false, true, false, _Tag>& std::_Enable_copy_move<true, false, true, false, _Tag>::operator=(const std::_Enable_copy_move<true, false, true, false, _Tag>&) [with _Tag = std::variant<float, frozen::set<int, 2, std::less<int> > >]’ In file included from /usr/include/c++/8/variant:38, from /tmp/testFrozen.cpp:2: /usr/include/c++/8/bits/enable_special_members.h:244:5: note: declared here operator=(_Enable_copy_move const&) noexcept = delete; ^~~~~~~~ In file included from /home/alex/DEV/STM32/frozen/include/frozen/map.h:28, from /tmp/testFrozen.cpp:3: /home/alex/DEV/STM32/frozen/include/frozen/bits/algorithms.h:90:5: error: use of deleted function ‘std::variant<_Types>& std::variant<_Types>::operator=(const std::variant<_Types>&) [with _Types = {float, frozen::set<int, 2, std::less<int> >}]’ b = tmp; ~~^~~~~

[serge-sans-paille]

Strange, the following now compiles fine on my setup: #include <variant> #include <frozen/map.h> #include <frozen/string.h> #include <frozen/set.h> using test_variant_t = std::variant<float , frozen::set<int, 2> >; constexpr auto conf_dict = frozen::make_map<frozen::string, test_variant_t> ({ {"A", 10.0f} }); int main (void) {} compiled with clang++ a.cpp --std=c++2a -Iinclude Same for gcc 8.2

[alex31]

Sorry, it works, I was thinking that the fix was already in master. Using set_of_set branch, it works !

Thanks a lot !