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use of common, default template type when using nth_type fails on GCC 7 #151

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thirtytwobits opened this issue Jan 20, 2025 · 0 comments

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thirtytwobits commented Jan 20, 2025

In variant constructors (variant.hpp) we use a pattern like:

template<typename U,
    std::size_t Ix = detail::var::best_converting_ctor_index_v<U, Ts...>,
    typename Alt                                                              = nth_type<Ix>,
    std::enable_if_t<std::is_constructible<Alt, U>::value, int>               = 0,
...

On GCC 7 the subsequent uses of Alt fail. Textually replacing Alt with nth_type<Ix> works around this problem.

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