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Use variant_alternative_t directly for references

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This commit is contained in:
Peter Dimov
2019-02-21 22:42:21 +02:00
parent d8cd270268
commit 34933c35bd
1 changed files with 3 additions and 3 deletions
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6
include/boost/variant2/variant.hpp
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@ -1544,13 +1544,13 @@ template<class F> struct Qret
template<class L> using front_if_same = mp11::mp_if<mp11::mp_apply<mp11::mp_same, L>, mp11::mp_front<L>>;
template<class V, class N, class T = variant_alternative_t<N::value, typename std::remove_reference<V>::type>> using apply_cv_ref_ = mp11::mp_if<std::is_reference<V>, T&, T>;
template<class N, class V> using var_alt = variant_alternative_t<N::value, V>;
#if BOOST_WORKAROUND( BOOST_MSVC, < 1920 )
template<class V> struct apply_cv_ref_impl
{
template<class T> using _f = apply_cv_ref_<V, T>;
template<class N> using _f = var_alt<N, V>;
using L = mp11::mp_iota<variant_size<V>>;
@ -1561,7 +1561,7 @@ template<class V> using apply_cv_ref = typename apply_cv_ref_impl<V>::type;
#else
template<class V> using apply_cv_ref = mp11::mp_transform_q<mp11::mp_bind_front<apply_cv_ref_, V>, mp11::mp_iota<variant_size<V>>>;
template<class V> using apply_cv_ref = mp11::mp_transform_q<mp11::mp_bind_back<var_alt, V>, mp11::mp_iota<variant_size<V>>>;
#endif