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C++20: require implicit conversion for hana::is_convertible by static_cast #492

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C++20: require implicit conversion for hana::is_convertible by static_cast #492

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11621ac
Require implicit conversion for hana::is_convertible by static_cast
ecatmur Aug 9, 2021
d0103cf
Merge branch 'master' into is-constructible-cpp20
ecatmur Jul 19, 2022
44e9235
Merge branch 'master' into is-constructible-cpp20
ecatmur Aug 8, 2023
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11 changes: 9 additions & 2 deletions include/boost/hana/core/to.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,8 @@ namespace boost { namespace hana {
};

template <typename To, typename From>
struct maybe_static_cast<To, From, decltype((void)
static_cast<To>(std::declval<From>())
struct maybe_static_cast<To, From, decltype(
std::declval<void(&)(To)>()(std::declval<From>())
)> {
template <typename X>
static constexpr To apply(X&& x)
Expand All @@ -63,6 +63,13 @@ namespace boost { namespace hana {
: convert_detail::maybe_static_cast<To, From>
{ };

template <typename To, typename From>
struct to_impl<To, From, when<std::is_void<To>::value>> {
template <typename X>
static constexpr X apply(X&&)
{ return; }
};

template <typename To>
struct to_impl<To, To> : embedding<> {
template <typename X>
Expand Down