tmp/tmpj77gq3an/{from.md → to.md}
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| 1 |
+
##### Member functions <a id="saferecl.hp.holder.mem">[[saferecl.hp.holder.mem]]</a>
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``` cpp
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bool empty() const noexcept;
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```
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*Returns:* `true` if and only if `*this` is empty.
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``` cpp
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template<class T> T* protect(const atomic<T*>& src) noexcept;
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```
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*Effects:* Equivalent to:
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``` cpp
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T* ptr = src.load(memory_order::relaxed);
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while (!try_protect(ptr, src)) {}
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return ptr;
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```
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``` cpp
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template<class T> bool try_protect(T*& ptr, const atomic<T*>& src) noexcept;
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```
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*Mandates:* `T` is a hazard-protectable type.
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*Preconditions:* `*this` is not empty.
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*Effects:* Performs the following steps in order:
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| 30 |
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- Initializes a variable `old` of type `T*` with the value of `ptr`.
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- Evaluates `reset_protection(old)`.
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- Assigns the value of `src.load(memory_order::acquire)` to `ptr`.
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- If `old == ptr` is `false`, evaluates `reset_protection()`.
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*Returns:* `old == ptr`.
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``` cpp
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template<class T> void reset_protection(const T* ptr) noexcept;
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```
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*Mandates:* `T` is a hazard-protectable type.
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| 43 |
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*Preconditions:* `*this` is not empty.
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| 45 |
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| 46 |
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*Effects:* If `ptr` is a null pointer value, invokes
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| 47 |
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`reset_protection()`. Otherwise, associates the hazard pointer owned by
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| 48 |
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`*this` with `*ptr`, thereby ending the current protection epoch.
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| 50 |
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*Complexity:* Constant.
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``` cpp
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void reset_protection(nullptr_t = nullptr) noexcept;
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```
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*Preconditions:* `*this` is not empty.
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*Ensures:* The hazard pointer owned by `*this` is unassociated.
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| 60 |
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*Complexity:* Constant.
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| 61 |
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``` cpp
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void swap(hazard_pointer& other) noexcept;
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```
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*Effects:* Swaps the hazard pointer ownership of this object with that
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| 67 |
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of `other`.
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[*Note 1*: The owned hazard pointers, if any, remain unchanged during
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| 70 |
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the swap and continue to be associated with the respective objects that
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| 71 |
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they were protecting before the swap, if any. No protection epochs are
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| 72 |
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ended or initiated. — *end note*]
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| 73 |
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| 74 |
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*Complexity:* Constant.
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| 75 |
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