C++ std::string 和 std::basic_string 有什么区别？为什么两者都需要？
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What's the difference between std::string and std::basic_string? And why are both needed?
提问by Benj
What's the difference between std::stringand std::basic_string? And why are both needed?
std::string和 和有std::basic_string什么区别？为什么两者都需要？
采纳答案by CB Bailey
std::basic_stringis a class template for making strings out of character types, std::stringis a typedeffor a specialization of that class template for char. Yes they are both needed (or at least required by the standard).
std::basic_string是用于从字符类型中生成字符串的类模板，std::string是typedef用于char. 是的，它们都是需要的（或者至少是标准要求的）。
回答by pmr
std::stringis an instantiation of std::basic_string<T>:
std::string是一个实例化std::basic_string<T>：
typedef std::basic_string<char> string
std::basic_stringis necessary to have a similar interface for all type of strings (wstringfor example).
std::basic_string必须为所有类型的字符串（wstring例如）提供类似的接口。
回答by Zanson
A std::stringis an instantiation of the std::basic_stringtemplate with a type of char. You need both so that you can make strings of things besides char, such a std::basic_string<wchar_t>for a string of wide characters. Or if you want a string with 32 bit elements, std::basic_string<unsigned int>.
Astd::string是std::basic_string模板的实例化，类型为char。您需要两者，以便您可以制作除 之外的字符串char，例如std::basic_string<wchar_t>用于宽字符的字符串。或者，如果您想要一个包含 32 位元素的字符串，std::basic_string<unsigned int>.
