编程参考 - 在C++移动构造函数声明中使用noexcept

在 C++ 中，noexcept 是用于表示函数不抛出异常的指定符。它既可用于常规函数，也可用于特殊成员函数，包括构造函数和析构函数。使用 noexcept 可以帮助编译器进行优化，提高代码的安全性和正确性。

In C++, noexcept is a specifier used to indicate that a function does not throw exceptions. It can be applied to both regular functions and special member functions, including constructors and destructors. Using noexcept helps the compiler make optimizations and can improve the safety and correctness of the code.

Usage of noexcept

1, Declaring Non-Throwing Functions:

void func() noexcept {

    // Function implementation

}

2, Conditional noexcept:

You can specify that a function is noexcept based on a condition, typically an expression that evaluates to true or false at compile time.

template <typename T>

void func(T t) noexcept(noexcept(t.method())) {

    t.method();

}

In this example, func is declared noexcept if t.method() is noexcept.

3, Move Constructor and Move Assignment Operator:

Declaring move constructors and move assignment operators as noexcept is a common practice, especially if they do not throw exceptions. This allows standard library containers, like std::vector, to use more efficient operations for moving elements.

class MyClass {