是否（条件）尝试{...}在C ++中合法？ [英] Is if (condition) try {...} legal in C++?

问题描述

例如：

if (true) try
{
    // works as expected with both true and false, but is it legal?
}
catch (...)
{
    // ...
}

换句话说，在if条件之后放置try-block 是否合法？

In other words, is it legal to put the try-block right after the if condition?

推荐答案

try 块的语法（这是一个语句）

The syntax of a try block (which is a statement in C++) is

try compound-statement handler-sequence

而如果是：

attr(optional) if ( condition ) statement_true      
attr(optional) if ( condition ) statement_true else statement_false     

其中：

statement-true - 任何语句（通常是复合语句），如果条件求值为true，
执行
statement-false - 任何
语句（通常是复合语句），这是执行如果条件
评估为false

statement-true - any statement (often a compound statement), which is executed if condition evaluates to true
statement-false - any statement (often a compound statement), which is executed if condition evaluates to false

所以是的，你的代码是 C ++ 。

So yes, your code is legal code in C++.

statement_true 在你的情况下是一个 try block。

statement_true in your case is a try block.

在合法性方面，它类似于：

In legality, it is similar to:

if (condition) for(...) {
    ...
}

但您的代码不是很可读，并且当添加 else 时，可能会成为某些C ++陷阱的受害者。所以，建议在之后添加 {...} ，如果在你的情况下。

But your code is not very readable and can be the victim of some C++ pitfalls when an else is added. So, it is advisable to add explicit {...} after if in your case.

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