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Disable errc_t -> arithmetic conversions when initializing result (closes #74)

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Peter Dimov
2021-12-11 01:22:08 +02:00
parent 8c9ceba775
commit 01ce081470
1 changed files with 11 additions and 0 deletions
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11
include/boost/system/result.hpp
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@ -39,6 +39,15 @@ constexpr in_place_value_t in_place_value{};
using in_place_error_t = variant2::in_place_index_t<1>;
constexpr in_place_error_t in_place_error{};
namespace detail
{
template<class T> using remove_cvref = typename std::remove_cv< typename std::remove_reference<T>::type >::type;
template<class... T> using is_errc_t = std::is_same<mp11::mp_list<remove_cvref<T>...>, mp11::mp_list<errc::errc_t>>;
} // namespace detail
// result
template<class T, class E = error_code> class result
@ -65,6 +74,7 @@ public:
// implicit, value
template<class A = T, typename std::enable_if<
std::is_convertible<A, T>::value &&
!(detail::is_errc_t<A>::value && std::is_arithmetic<T>::value) &&
!std::is_constructible<E, A>::value, int>::type = 0>
constexpr result( A&& a )
noexcept( std::is_nothrow_constructible<T, A>::value )
@ -85,6 +95,7 @@ public:
// explicit, value
template<class... A, class En = typename std::enable_if<
std::is_constructible<T, A...>::value &&
!(detail::is_errc_t<A...>::value && std::is_arithmetic<T>::value) &&
!std::is_constructible<E, A...>::value
>::type>
explicit constexpr result( A&&... a )