为什么要使用C ++在C ++字符串？ [英] Why use c strings in c++?

问题描述

有没有什么好的理由++使用C字符串用C时下？我的课本使用它们在某些点的例子，我真的觉得它会更容易只使用一个std :: string的。

Is there any good reason to use C-strings in C++ nowadays? My textbook uses them in examples at some points, and I really feel like it would be easier just to use a std::string.

推荐答案

我不得不使用它们的唯一理由是与用C风格的字符串第三方库连接时。也可能有深奥的情况下，您会使用性能方面的原因C形式的字符串，但更多的，往往不是在使用C ++字符串的方法可能是更快，因为内联和专业化等。

The only reasons I've had to use them is when interfacing with 3rd party libraries that use C style strings. There might also be esoteric situations where you would use C style strings for performance reasons, but more often than not, using methods on C++ strings is probably faster due to inlining and specialization, etc.

您可以使用 c_str（ ） 与排序的API时，但你应该知道，*返回的char是常量，你不应该修改通过该指针字符串的方法在许多情况下。在这些类型的情况下，你仍然可以使用矢量＆lt;＆烧焦GT;相反，至少变得更容易的内存管理的好处。

You can use the c_str() method in many cases when working with those sort of APIs, but you should be aware that the char * returned is const, and you should not modify the string via that pointer. In those sort of situations, you can still use a vector<char> instead, and at least get the benefit of easier memory management.

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