c++ - 为什么VC++引入非标准关键字: __leave?

Question

根据 MSDN :

The __leave statement is more efficient because it does not cause stack unwinding.

以我的理解，就是说:“这样一个普通的代码片段是危险的!”

struct A
{
    int* p;

    A() : p(new int) {}
    ~A() { delete p; }
};

void f()
{
    __try
    {
        A a;
        ... // Doing somthing
        if (the thing has gone bad) __leave;
        ... // Continue
    }
    __finally
    {}
}

在 C++ 项目中完全避免 __leave 是最佳实践吗？

Answer 1

http://msdn.microsoft.com/en-us/library/yb3kz605.aspx

说:

For C++ programs, C++ exception handling should be used instead of structured exception handling. For more information, see Exception Handling in the C++ Language Reference.

编辑:此外，通常最好不要使用编译器特定的功能。