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Add value list support to mp_second, mp_third. Refs #53.

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Peter Dimov
2023-05-15 15:23:05 +03:00
parent d02f361b1b
commit 90669f2ff4
4 changed files with 84 additions and 0 deletions
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18
include/boost/mp11/list.hpp
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@@ -157,6 +157,15 @@ template<template<class...> class L, class T1, class T2, class... T> struct mp_s
using type = T2;
};
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
template<template<auto...> class L, auto A1, auto A2, auto... A> struct mp_second_impl<L<A1, A2, A...>>
{
using type = mp_value<A2>;
};
#endif
} // namespace detail
template<class L> using mp_second = typename detail::mp_second_impl<L>::type;
@@ -176,6 +185,15 @@ template<template<class...> class L, class T1, class T2, class T3, class... T> s
using type = T3;
};
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
template<template<auto...> class L, auto A1, auto A2, auto A3, auto... A> struct mp_third_impl<L<A1, A2, A3, A...>>
{
using type = mp_value<A3>;
};
#endif
} // namespace detail
template<class L> using mp_third = typename detail::mp_third_impl<L>::type;