tmp/tmpwr2a1p_f/{from.md → to.md}
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| 1 |
+
#### General <a id="atomics.types.generic.general">[[atomics.types.generic.general]]</a>
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| 3 |
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``` cpp
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+
namespace std {
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template<class T> struct atomic {
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using value_type = T;
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static constexpr bool is_always_lock_free = implementation-defined // whether a given atomic type's operations are always lock free;
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bool is_lock_free() const volatile noexcept;
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bool is_lock_free() const noexcept;
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// [atomics.types.operations], operations on atomic types
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constexpr atomic() noexcept(is_nothrow_default_constructible_v<T>);
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constexpr atomic(T) noexcept;
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atomic(const atomic&) = delete;
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atomic& operator=(const atomic&) = delete;
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atomic& operator=(const atomic&) volatile = delete;
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T load(memory_order = memory_order::seq_cst) const volatile noexcept;
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T load(memory_order = memory_order::seq_cst) const noexcept;
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operator T() const volatile noexcept;
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operator T() const noexcept;
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void store(T, memory_order = memory_order::seq_cst) volatile noexcept;
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void store(T, memory_order = memory_order::seq_cst) noexcept;
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T operator=(T) volatile noexcept;
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T operator=(T) noexcept;
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T exchange(T, memory_order = memory_order::seq_cst) volatile noexcept;
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T exchange(T, memory_order = memory_order::seq_cst) noexcept;
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bool compare_exchange_weak(T&, T, memory_order, memory_order) volatile noexcept;
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bool compare_exchange_weak(T&, T, memory_order, memory_order) noexcept;
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bool compare_exchange_strong(T&, T, memory_order, memory_order) volatile noexcept;
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bool compare_exchange_strong(T&, T, memory_order, memory_order) noexcept;
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| 34 |
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bool compare_exchange_weak(T&, T, memory_order = memory_order::seq_cst) volatile noexcept;
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| 35 |
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bool compare_exchange_weak(T&, T, memory_order = memory_order::seq_cst) noexcept;
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| 36 |
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bool compare_exchange_strong(T&, T, memory_order = memory_order::seq_cst) volatile noexcept;
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| 37 |
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bool compare_exchange_strong(T&, T, memory_order = memory_order::seq_cst) noexcept;
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| 38 |
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void wait(T, memory_order = memory_order::seq_cst) const volatile noexcept;
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void wait(T, memory_order = memory_order::seq_cst) const noexcept;
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| 41 |
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void notify_one() volatile noexcept;
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| 42 |
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void notify_one() noexcept;
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| 43 |
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void notify_all() volatile noexcept;
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| 44 |
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void notify_all() noexcept;
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| 45 |
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};
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}
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| 47 |
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```
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The template argument for `T` shall meet the *Cpp17CopyConstructible*
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and *Cpp17CopyAssignable* requirements. The program is ill-formed if any
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of
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| 52 |
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| 53 |
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- `is_trivially_copyable_v<T>`,
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| 54 |
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- `is_copy_constructible_v<T>`,
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| 55 |
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- `is_move_constructible_v<T>`,
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| 56 |
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- `is_copy_assignable_v<T>`, or
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| 57 |
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- `is_move_assignable_v<T>`
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| 58 |
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is `false`.
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| 60 |
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| 61 |
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[*Note 1*: Type arguments that are not also statically initializable
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| 62 |
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can be difficult to use. — *end note*]
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| 63 |
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The specialization `atomic<bool>` is a standard-layout struct.
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| 65 |
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[*Note 2*: The representation of an atomic specialization need not have
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| 67 |
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the same size and alignment requirement as its corresponding argument
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| 68 |
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type. — *end note*]
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| 69 |
+
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