vector-of-bool
6 年之前
+ 14
- 7
src/dds/util/tl.hpp
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| @@ -11,7 +11,10 @@ template <std::size_t I, | |||
| typename B = std::nullptr_t, | |||
| typename C = std::nullptr_t, | |||
| typename D = std::nullptr_t> | |||
| decltype(auto) nth_arg(A&& a = nullptr, B&& b = nullptr, C&& c = nullptr, D&& d = nullptr) { | |||
| decltype(auto) nth_arg(A&& a[[maybe_unused]] = nullptr, | |||
| B&& b[[maybe_unused]] = nullptr, | |||
| C&& c[[maybe_unused]] = nullptr, | |||
| D&& d[[maybe_unused]] = nullptr) { | |||
| if constexpr (I == 0) { | |||
| return (A &&) a; | |||
| } else if constexpr (I == 1) { | |||
| @@ -27,12 +30,16 @@ decltype(auto) nth_arg(A&& a = nullptr, B&& b = nullptr, C&& c = nullptr, D&& d | |||
| // Based on https://github.com/Quincunx271/TerseLambda | |||
| #define DDS_CTL(...) \ | |||
| (auto&&... _args_)->auto { \ | |||
| [[maybe_unused]] auto&& _1 = ::dds::detail::nth_arg<0>((decltype(_args_)&&)(_args_)...); \ | |||
| [[maybe_unused]] auto&& _2 = ::dds::detail::nth_arg<1>((decltype(_args_)&&)(_args_)...); \ | |||
| [[maybe_unused]] auto&& _3 = ::dds::detail::nth_arg<2>((decltype(_args_)&&)(_args_)...); \ | |||
| [[maybe_unused]] auto&& _4 = ::dds::detail::nth_arg<3>((decltype(_args_)&&)(_args_)...); \ | |||
| static_assert(sizeof...(_args_) <= 4); \ | |||
| (auto&&... tl_args)->auto { \ | |||
| [[maybe_unused]] auto&& _1 = ::dds::detail::nth_arg<0, decltype(tl_args)...>( \ | |||
| static_cast<decltype(tl_args)&&>(tl_args)...); \ | |||
| [[maybe_unused]] auto&& _2 = ::dds::detail::nth_arg<1, decltype(tl_args)...>( \ | |||
| static_cast<decltype(tl_args)&&>(tl_args)...); \ | |||
| [[maybe_unused]] auto&& _3 = ::dds::detail::nth_arg<2, decltype(tl_args)...>( \ | |||
| static_cast<decltype(tl_args)&&>(tl_args)...); \ | |||
| [[maybe_unused]] auto&& _4 = ::dds::detail::nth_arg<3, decltype(tl_args)...>( \ | |||
| static_cast<decltype(tl_args)&&>(tl_args)...); \ | |||
| static_assert(sizeof...(tl_args) <= 4); \ | |||
| return (__VA_ARGS__); \ | |||
| } | |||
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