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Avoid an extraneous macro and use a simplified type alias

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This commit is contained in:
Chris Robinson 2019-10-27 00:47:33 -07:00
parent cac4072781
commit 697da8724f
1 changed files with 4 additions and 4 deletions
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8
common/alspan.h
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@ -72,15 +72,16 @@ namespace detail_ {
struct has_size_and_data<T,
void_t<decltype(al::size(std::declval<T>())), decltype(al::data(std::declval<T>()))>>
: std::true_type { };
template<typename T>
using remove_pointer_t = typename std::remove_pointer<T>::type;
} // namespace detail_
#define REQUIRES(...) bool rt_=true, typename std::enable_if<rt_ && (__VA_ARGS__),bool>::type = true
#define USABLE_CONTAINER_DATA(...) \
std::is_convertible<typename std::remove_pointer<decltype(al::data(std::declval<__VA_ARGS__>()))>::type(*)[],element_type(*)[]>::value
#define IS_VALID_CONTAINER(C) \
!detail_::is_span<C>::value && !detail_::is_std_array<C>::value && \
!std::is_array<C>::value && detail_::has_size_and_data<C>::value && \
USABLE_CONTAINER_DATA(C&)
std::is_convertible<detail_::remove_pointer_t<decltype(al::data(std::declval<C&>()))>(*)[],element_type(*)[]>::value
template<typename T, size_t E>
class span {
@ -289,7 +290,6 @@ constexpr inline auto span<T,E>::subspan(size_t offset, size_t count) const -> s
}
#undef IS_VALID_CONTAINER
#undef USABLE_CONTAINER_DATA
#undef REQUIRES
} // namespace al