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[ constructors ] prevent empty optional access

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optional types being taken in were forwarding their values without checking, resulting in segfaults on optional<U> -> optional<T> conversions. This fixes those problems in the constructors.
This commit is contained in:
The Phantom Derpstorm
2019-02-13 09:00:07 -05:00
committed by GitHub
parent 5d3d6c399a
commit 1de2f2a49c
1 changed files with 12 additions and 4 deletions
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8
tl/optional.hpp
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@@ -1190,16 +1190,20 @@ public:
class U, detail::enable_from_other<T, U, const U &> * = nullptr,
detail::enable_if_t<std::is_convertible<const U &, T>::value> * = nullptr>
optional(const optional<U> &rhs) {
if (rhs.has_value()) {
this->construct(*rhs);
}
}
/// \exclude
template <class U, detail::enable_from_other<T, U, const U &> * = nullptr,
detail::enable_if_t<!std::is_convertible<const U &, T>::value> * =
nullptr>
explicit optional(const optional<U> &rhs) {
if (rhs.has_value()) {
this->construct(*rhs);
}
}
/// Converting move constructor.
/// \synopsis template <class U> optional(optional<U> &&rhs);
@@ -1207,16 +1211,20 @@ public:
class U, detail::enable_from_other<T, U, U &&> * = nullptr,
detail::enable_if_t<std::is_convertible<U &&, T>::value> * = nullptr>
optional(optional<U> &&rhs) {
if (rhs.has_value()) {
this->construct(std::move(*rhs));
}
}
/// \exclude
template <
class U, detail::enable_from_other<T, U, U &&> * = nullptr,
detail::enable_if_t<!std::is_convertible<U &&, T>::value> * = nullptr>
explicit optional(optional<U> &&rhs) {
if (rhs.has_value()) {
this->construct(std::move(*rhs));
}
}
/// Destroys the stored value if there is one.
~optional() = default;