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Disable std::hash<gsl::not_null<T>> if std::hash<T> is not enabled. (#1109)

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Resolves #914
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Dmitry Kobets 2023-05-10 11:25:04 -07:00 committed by GitHub
parent 5dc7fae119
commit 4b5b5a1ed5
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1 changed files with 17 additions and 7 deletions
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24
include/gsl/pointers
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@ -215,14 +215,28 @@ not_null<T> operator+(const not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
not_null<T> operator+(std::ptrdiff_t, const not_null<T>&) = delete;
template <class T, class U = decltype(std::declval<const T&>().get()), bool = std::is_default_constructible<std::hash<U>>::value>
struct not_null_hash
{
std::size_t operator()(const T& value) const { return std::hash<U>{}(value.get()); }
};
template <class T, class U>
struct not_null_hash<T, U, false>
{
not_null_hash() = delete;
not_null_hash(const not_null_hash&) = delete;
not_null_hash& operator=(const not_null_hash&) = delete;
};
} // namespace gsl
namespace std
{
template <class T>
struct hash<gsl::not_null<T>>
struct hash<gsl::not_null<T>> : gsl::not_null_hash<gsl::not_null<T>>
{
std::size_t operator()(const gsl::not_null<T>& value) const { return hash<T>{}(value.get()); }
};
} // namespace std
@ -323,12 +337,8 @@ strict_not_null(T) -> strict_not_null<T>;
namespace std
{
template <class T>
struct hash<gsl::strict_not_null<T>>
struct hash<gsl::strict_not_null<T>> : gsl::not_null_hash<gsl::strict_not_null<T>>
{
std::size_t operator()(const gsl::strict_not_null<T>& value) const
{
return hash<T>{}(value.get());
}
};
} // namespace std