tmp/tmpgvps4tk6/{from.md → to.md}
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### Specializations for floating-point types <a id="atomics.ref.float">[[atomics.ref.float]]</a>
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There are specializations of the `atomic_ref` class template for
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floating-point types
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provides additional atomic operations appropriate to floating-point
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types.
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``` cpp
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namespace std {
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template<> struct atomic_ref<floating-point> {
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private:
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floating-point* ptr;
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public:
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using value_type = floating-point;
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using difference_type = value_type;
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static constexpr size_t required_alignment = implementation-defined // required alignment for atomic_ref type's operations;
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static constexpr bool is_always_lock_free = implementation-defined // whether a given atomic_ref type's operations are always lock free;
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bool is_lock_free() const noexcept;
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explicit atomic_ref(floating-point&);
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atomic_ref(const atomic_ref&) noexcept;
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atomic_ref& operator=(const atomic_ref&) = delete;
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void store(floating-point, memory_order = memory_order::seq_cst) const noexcept;
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floating-point operator=(floating-point) const noexcept;
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floating-point load(memory_order = memory_order::seq_cst) const noexcept;
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operator floating-point() const noexcept;
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floating-point exchange(floating-point,
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memory_order = memory_order::seq_cst) const noexcept;
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bool compare_exchange_weak(floating-point&, floating-point,
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memory_order, memory_order) const noexcept;
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bool compare_exchange_strong(floating-point&, floating-point,
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memory_order, memory_order) const noexcept;
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bool compare_exchange_weak(floating-point&, floating-point,
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memory_order = memory_order::seq_cst) const noexcept;
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bool compare_exchange_strong(floating-point&, floating-point,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point fetch_add(floating-point,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point fetch_sub(floating-point,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point operator+=(floating-point) const noexcept;
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floating-point operator-=(floating-point) const noexcept;
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void wait(floating-point, memory_order = memory_order::seq_cst) const noexcept;
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void notify_one() const noexcept;
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void notify_all() const noexcept;
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};
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}
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```
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Descriptions are provided below only for members that differ from the
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primary template.
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The following operations perform arithmetic computations. The
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operator, and computation
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[[atomic.types.int.comp]].
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``` cpp
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floating-point fetch_key(floating-point operand,
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memory_order order = memory_order::seq_cst) const noexcept;
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```
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*Effects:* Atomically replaces the value referenced by `*ptr` with the
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result of the computation applied to the value referenced by `*ptr` and
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@@ -76,19 +77,19 @@ operations [[intro.races]].
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the effects.
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*Remarks:* If the result is not a representable value for its
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type [[expr.pre]], the result is unspecified, but the operations
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otherwise have no undefined behavior. Atomic arithmetic operations on
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*`floating-point`* should conform to the
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`std::numeric_limits<`*`floating-point`*`>` traits associated with
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floating-point type [[limits.syn]]. The floating-point
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environment [[cfenv]] for atomic arithmetic operations on
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*`floating-point`* may be different than the calling thread’s
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floating-point environment.
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``` cpp
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floating-point operator op=(floating-point operand) const noexcept;
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```
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*Effects:* Equivalent to:
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`return fetch_`*`key`*`(operand) `*`op`*` operand;`
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#### Specializations for floating-point types <a id="atomics.ref.float">[[atomics.ref.float]]</a>
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There are specializations of the `atomic_ref` class template for all
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cv-unqualified floating-point types. For each such type
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`floating-point-type`, the specialization `atomic_ref<floating-point>`
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provides additional atomic operations appropriate to floating-point
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types.
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``` cpp
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namespace std {
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template<> struct atomic_ref<floating-point-type> {
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private:
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floating-point-type* ptr; // exposition only
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+
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public:
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using value_type = floating-point-type;
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using difference_type = value_type;
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static constexpr size_t required_alignment = implementation-defined // required alignment for atomic_ref type's operations;
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static constexpr bool is_always_lock_free = implementation-defined // whether a given atomic_ref type's operations are always lock free;
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bool is_lock_free() const noexcept;
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explicit atomic_ref(floating-point-type&);
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atomic_ref(const atomic_ref&) noexcept;
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atomic_ref& operator=(const atomic_ref&) = delete;
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void store(floating-point-type, memory_order = memory_order::seq_cst) const noexcept;
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floating-point-type operator=(floating-point-type) const noexcept;
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floating-point-type load(memory_order = memory_order::seq_cst) const noexcept;
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operator floating-point-type() const noexcept;
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floating-point-type exchange(floating-point-type,
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memory_order = memory_order::seq_cst) const noexcept;
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bool compare_exchange_weak(floating-point-type&, floating-point-type,
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memory_order, memory_order) const noexcept;
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bool compare_exchange_strong(floating-point-type&, floating-point-type,
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memory_order, memory_order) const noexcept;
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bool compare_exchange_weak(floating-point-type&, floating-point-type,
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memory_order = memory_order::seq_cst) const noexcept;
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bool compare_exchange_strong(floating-point-type&, floating-point-type,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point-type fetch_add(floating-point-type,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point-type fetch_sub(floating-point-type,
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memory_order = memory_order::seq_cst) const noexcept;
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floating-point-type operator+=(floating-point-type) const noexcept;
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floating-point-type operator-=(floating-point-type) const noexcept;
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void wait(floating-point-type, memory_order = memory_order::seq_cst) const noexcept;
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void notify_one() const noexcept;
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void notify_all() const noexcept;
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};
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}
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```
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Descriptions are provided below only for members that differ from the
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primary template.
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The following operations perform arithmetic computations. The
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correspondence among key, operator, and computation is specified in
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[[atomic.types.int.comp]].
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``` cpp
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floating-point-type fetch_key(floating-point-type operand,
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memory_order order = memory_order::seq_cst) const noexcept;
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```
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*Effects:* Atomically replaces the value referenced by `*ptr` with the
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result of the computation applied to the value referenced by `*ptr` and
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the effects.
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*Remarks:* If the result is not a representable value for its
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type [[expr.pre]], the result is unspecified, but the operations
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otherwise have no undefined behavior. Atomic arithmetic operations on
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+
*`floating-point-type`* should conform to the
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+
`std::numeric_limits<`*`floating-point-type`*`>` traits associated with
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+
the floating-point type [[limits.syn]]. The floating-point
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environment [[cfenv]] for atomic arithmetic operations on
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+
*`floating-point-type`* may be different than the calling thread’s
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floating-point environment.
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``` cpp
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floating-point-type operator op=(floating-point-type operand) const noexcept;
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```
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*Effects:* Equivalent to:
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`return fetch_`*`key`*`(operand) `*`op`*` operand;`
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