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use C++17 syntax to get rid of recursive template instantiations for concatenating type signatures (#4587)

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Konstantin Bespalov 2023-03-24 06:01:09 +01:00 committed by GitHub
parent 286873ecf7
commit 5bbcba548a
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1 changed files with 13 additions and 0 deletions
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include/pybind11/detail/descr.h
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@ -143,11 +143,24 @@ constexpr descr<N, Ts...> concat(const descr<N, Ts...> &descr) {
return descr; return descr;
} }
#if defined(PYBIND11_CPP17)
template <size_t N1, size_t N2, typename... Ts1, typename... Ts2>
constexpr descr<N1 + N2 + 2, Ts1..., Ts2...> operator,(const descr<N1, Ts1...> &a,
const descr<N2, Ts2...> &b) {
return a + const_name(", ") + b;
}
template <size_t N, typename... Ts, typename... Args>
constexpr auto concat(const descr<N, Ts...> &d, const Args &...args) {
return (d, ..., args);
}
#else
template <size_t N, typename... Ts, typename... Args> template <size_t N, typename... Ts, typename... Args>
constexpr auto concat(const descr<N, Ts...> &d, const Args &...args) constexpr auto concat(const descr<N, Ts...> &d, const Args &...args)
-> decltype(std::declval<descr<N + 2, Ts...>>() + concat(args...)) { -> decltype(std::declval<descr<N + 2, Ts...>>() + concat(args...)) {
return d + const_name(", ") + concat(args...); return d + const_name(", ") + concat(args...);
} }
#endif
template <size_t N, typename... Ts> template <size_t N, typename... Ts>
constexpr descr<N + 2, Ts...> type_descr(const descr<N, Ts...> &descr) { constexpr descr<N + 2, Ts...> type_descr(const descr<N, Ts...> &descr) {