问题描述

我有以下模板函数用于将任何标准类型的数据转储到二进制输出流中.

I have the following template function used to dump data of any standard type into a binary output stream.

template<typename T> static void
dump ( const T& v, ostream& o ) {
    o.write ( reinterpret_cast<const char*>(&v), sizeof(T));
}

除了 reinterpret_cast，我还可以使用 C 风格(const char*).使用 reinterpret_cast 有什么特别的理由吗?我阅读了其他一些帖子，其中 reinterpret_cast 不受欢迎.但是上面的用法是合法的，不能用别的代替吧?

Instead of the reinterpret_cast I could also use a C-style (const char*). Is there any particular reason to use reinterpret_cast? I read a few other posts where reinterpret_cast was frowned upon. But the above usage is legal and cannot be replaced with anything else, right?

推荐答案

C 风格强制转换的问题在于它们在幕后做了很多事情.详细解释见这里:http://anteru.net/2007/12/18/200/

The problem with C-Style casts is that they do a lot under the hood. See here for a detailed explanation: http://anteru.net/2007/12/18/200/

您应该尝试始终使用 C++-casts，从长远来看会让生活更轻松.在这种情况下，C 样式转换的主要问题是您可以编写 (char*)(&v) 而使用 reinterpret_cast，您需要额外的 const_cast，所以更安全一些.此外，您可以使用正则表达式轻松找到 reinterpret_cast，而这对于 C 风格的转换是不可能的.

You should try to always use the C++-casts, makes life easier in the long run. The main problem with C-style casts in this case is that you could have written (char*)(&v) while with reinterpret_cast, you would need an additional const_cast, so it's a bit safer. Plus you can easily find reinterpret_cast with a regex, which is not possible for the C-style casts.

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