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Prevent SimpleGeneratorRef from being used as the copy constructor.

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This commit is contained in:
John McCall
2023-06-29 19:33:16 -04:00
parent e14f2bc0c7
commit cc5854bd91
1 changed files with 19 additions and 1 deletions
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20
include/swift/Basic/Generators.h
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@@ -146,6 +146,10 @@ public:
}
};
namespace generator_details {
template <class T> struct is_simple_generator_ref;
}
/// An abstracting reference to an existing generator.
///
/// The implementation of this type holds the reference to the existing
@@ -182,7 +186,8 @@ public:
constexpr SimpleGeneratorRef() : vtable(nullptr), pointer(nullptr) {}
template <class G>
constexpr SimpleGeneratorRef(G &generator)
constexpr SimpleGeneratorRef(G &generator,
typename std::enable_if<!generator_details::is_simple_generator_ref<G>::value, bool>::type = false)
: vtable(&VTableImpl<G>::vtable), pointer(&generator) {}
/// Test whether this generator ref was initialized with a
@@ -212,6 +217,19 @@ public:
}
};
namespace generator_details {
template <class T>
struct is_simple_generator_ref<SimpleGeneratorRef<T>> {
static constexpr bool value = true;
};
template <class T>
struct is_simple_generator_ref {
static constexpr bool value = false;
};
}
} // end namespace swift
#endif