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Do not consider types with explicit operator bool (such as result itself) constructible from bool for the purposes of result construction. Refs #104.

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Peter Dimov
2023-01-22 02:07:28 +02:00
parent 805b260a7a
commit c92d50abbd
1 changed files with 8 additions and 4 deletions
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12
include/boost/system/result.hpp
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@ -85,6 +85,10 @@ template<class T> using remove_cvref = typename std::remove_cv< typename std::re
template<class... T> using is_errc_t = std::is_same<mp11::mp_list<remove_cvref<T>...>, mp11::mp_list<errc::errc_t>>;
template<class T, class... A> struct is_constructible: std::is_constructible<T, A...> {};
template<class A> struct is_constructible<bool, A>: std::is_convertible<A, bool> {};
template<class A> struct is_constructible<bool const, A>: std::is_convertible<A, bool> {};
} // namespace detail
// result
@ -141,9 +145,9 @@ public:
// explicit, value
template<class... A, class En = typename std::enable_if<
std::is_constructible<T, A...>::value &&
detail::is_constructible<T, A...>::value &&
!(detail::is_errc_t<A...>::value && std::is_arithmetic<T>::value) &&
!std::is_constructible<E, A...>::value &&
!detail::is_constructible<E, A...>::value &&
sizeof...(A) >= 1
>::type>
explicit constexpr result( A&&... a )
@ -154,8 +158,8 @@ public:
// explicit, error
template<class... A, class En2 = void, class En = typename std::enable_if<
!std::is_constructible<T, A...>::value &&
std::is_constructible<E, A...>::value &&
!detail::is_constructible<T, A...>::value &&
detail::is_constructible<E, A...>::value &&
sizeof...(A) >= 1
>::type>
explicit constexpr result( A&&... a )