异常处理中的C++ Else语句

Question

我想知道是否有一个else语句,比如在python中,当附加到try-catch结构时,如果没有抛出/捕获异常,则使其中的代码块只能执行.

例如:

try {
    //code here
} catch(...) {
    //exception handling here
} ELSE {
    //this should execute only if no exceptions occurred
}

Answer 1

c++ 中不存在elsefortry块的概念。可以使用标志来模拟它：

{
    bool exception_caught = true;
    try
    {
        // Try block, without the else code:
        do_stuff_that_might_throw_an_exception();
        exception_caught = false; // This needs to be the last statement in the try block
    }
    catch (Exception& a)
    {
        // Handle the exception or rethrow, but do not touch exception_caught.
    }
    // Other catches elided.

    if (! exception_caught)
    {
        // The equivalent of the python else block goes here.
        do_stuff_only_if_try_block_succeeded();

    }
}

该do_stuff_only_if_try_block_succeeded()代码被执行只有在try块的执行没有抛出异常。请注意，如果 do_stuff_only_if_try_block_succeeded()确实抛出异常，则不会捕获该异常。这两个概念模仿了 pythontry ... catch ... else概念的意图。

Answer 2

为什么不把它放在try块的末尾？