经典C++(C with Classes)的Call/Return特性，现代语言有哪些? [英] Call/Return feature of classic C++(C with Classes), what modern languages have it?

问题描述

在 C++ 的设计和演变的第 57 页，Stroustrup 博士谈到了一个特性，它最初是 C with Classes 的一部分，但它不是现代 C++(标准 C++)的一部分.该功能称为调用/返回.这是一个例子:

On page 57 of The Design and Evolution of C++, Dr. Stroustrup talks about a feature that was initially part of C with Classes, but it isn't part of modern C++(standard C++). The feature is called call/return. This is an example:

class myclass
{
  call() { /* do something before each call to a function. */ }
  return() { /* do something else after each call to a function. */ }
  ...
};

我觉得这个功能很有趣.是否有任何现代语言具有这种特殊功能?

I find this feature very interesting. Does any modern language have this particular feature?

推荐答案

现代 C++ 的等价物是哨兵对象:在函数的开头构造它，其构造函数实现 call()，并在返回(或异常退出)时，其析构函数实现 return().

The modern C++ equivalent would be a sentry object: construct it at the beginning of a function, with its constructor implementing call(), and upon return (or abnormal exit), its destructor implements return().

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