std::atomic_double
时间: 2023-11-07 09:50:24 浏览: 49
std::atomic<double> 是C++中提供的一个原子类型,用于支持多线程环境下的原子操作。它可以保证对于该类型的操作是原子的,即不会被其他线程中断或干扰。
在使用 std::atomic<double> 时,可以通过成员函数来进行原子操作,比如加载(load)、存储(store)、交换(swap)等。例如:
```cpp
#include <atomic>
std::atomic<double> myAtomicDouble;
void updateAtomicDouble(double newValue) {
myAtomicDouble.store(newValue);
}
double getAtomicDouble() {
return myAtomicDouble.load();
}
```
在上面的示例中,`store`函数用于存储一个新值到 `myAtomicDouble` 中,而`load`函数用于获取当前的值。
需要注意的是,std::atomic<double> 的使用需要考虑内存模型和同步问题。正确地使用原子操作可以确保线程安全,避免数据竞争等问题。
相关问题
std::atomic_store
std::atomic_store is a function in the C++ standard library that allows you to atomically store a value into an atomic object. It ensures that the operation is performed as a single, indivisible operation, without any intermediate states visible to other threads.
The syntax for std::atomic_store is as follows:
```cpp
void atomic_store(std::atomic<T>* obj, const T& value);
```
Here, `obj` is a pointer to an std::atomic object, and `value` is the new value to be stored.
For example, let's say we have an atomic integer `std::atomic<int> count` and we want to store the value 10 atomically:
```cpp
std::atomic<int> count;
std::atomic_store(&count, 10);
```
In this case, the value 10 would be stored into `count` atomically, ensuring that no other thread can observe intermediate states during the operation.
It's important to note that std::atomic_store only performs the store operation and does not return any value. If you need to retrieve the previous value, you can use std::atomic_exchange instead.
std::atomic_bool
std::atomic_bool是C++11中的一个原子布尔类型。它提供了原子的读写操作,以及其他一些原子操作函数,如exchange、compare_exchange等。std::atomic_bool的使用方式类似于普通的布尔变量,但具有原子性,可以安全地在多个线程间使用。可以使用赋值运算符=来设置std::atomic_bool的值,可以使用load函数来读取std::atomic_bool的值。此外,std::atomic_bool还提供了test_and_set和clear函数来对std::atomic_bool进行原子的设置和清除操作。<em>1</em><em>2</em><em>3</em>
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