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try vc2015 countof ut

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mutouyun 2022-03-01 12:03:34 +08:00
parent da22d0f7b2
commit c4029bcde9
1 changed files with 8 additions and 11 deletions
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19
src/libipc/utility/countof.h
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@ -17,11 +17,6 @@ LIBIPC_NAMESPACE_BEG_
* @see https://en.cppreference.com/w/cpp/iterator/size * @see https://en.cppreference.com/w/cpp/iterator/size
*/ */
template <typename T, std::size_t N>
constexpr std::size_t countof(T const (&)[N]) noexcept {
return N;
}
namespace detail { namespace detail {
template <typename C, typename = void> template <typename C, typename = void>
@ -48,13 +43,18 @@ template <typename C, bool = countof_trait_has_size<C>::value
, bool = countof_trait_has_Size<C>::value> , bool = countof_trait_has_Size<C>::value>
struct countof_trait; struct countof_trait;
template <typename T, std::size_t N>
struct countof_trait<T[N], false, false> {
constexpr static auto countof(T const (&)[N]) noexcept {
return N;
}
};
template <typename C, bool B> template <typename C, bool B>
struct countof_trait<C, true, B> { struct countof_trait<C, true, B> {
constexpr static auto countof(C const &c) noexcept(noexcept(c.size())) { constexpr static auto countof(C const &c) noexcept(noexcept(c.size())) {
return c.size(); return c.size();
} }
using return_t = decltype(countof_trait::countof(std::declval<C>()));
enum : bool { noexcept_value = noexcept(countof_trait::countof(std::declval<C>())) };
}; };
template <typename C> template <typename C>
@ -62,15 +62,12 @@ struct countof_trait<C, false, true> {
constexpr static auto countof(C const &c) noexcept(noexcept(c.Size())) { constexpr static auto countof(C const &c) noexcept(noexcept(c.Size())) {
return c.Size(); return c.Size();
} }
using return_t = decltype(countof_trait::countof(std::declval<C>()));
enum : bool { noexcept_value = noexcept(countof_trait::countof(std::declval<C>())) };
}; };
} // namespace detail } // namespace detail
template <typename C, typename R = detail::countof_trait<C>> template <typename C, typename R = detail::countof_trait<C>>
constexpr auto countof(C const &c) noexcept(R::noexcept_value) constexpr auto countof(C const &c) noexcept(noexcept(R::countof(c))) {
-> typename R::return_t {
return R::countof(c); return R::countof(c);
} }