non-local static对象

Non-local static objects are objects that are declared as static within a function or method, but are not local to that function or method. Instead, they have static storage duration, meaning that they exist throughout the entire lifetime of the program.

Non-local static objects are initialized only once, the first time the function or method containing the declaration is called, and they retain their values between subsequent calls. This can be useful for maintaining state across multiple calls of the same function or method.

However, non-local static objects can lead to issues with thread safety and can make it difficult to reason about program behavior, especially in large or complex programs. Therefore, it is generally recommended to use non-local static objects sparingly and to carefully consider the potential consequences before using them.