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为什么std :: string实现为char的basic_string而不是unsigned char的

[英]Why is std::string implemented as basic_string of `char` and not `unsigned char`

原文 2017-05-14 11:17:02 5 1 c++/ string

typedef basic_string<char> string;

All the std::string facilities in the standard library are using char . 标准库中的所有std::string工具都使用char 。 Why is that? 这是为什么？ Although all the characters of the ASCII table (128) fit into the range of a char (-128 to 127), many other character encodings are using 8-bits for representation. 尽管ASCII表（128）的所有字符都适合char （-128到127）的范围，但是许多其他字符编码使用8位表示。

What is the advantage of having 'negative' values in a string of chars? 在字符串字符中具有“负”值的好处是什么？

1 个解决方案

字符串文字的类型为const char* ，因此在执行std::string("fooo")时将需要O（n）转换。

字符串文字转换为basic_string <unsigned char> - String literal to basic_string<unsigned char>

将cout与basic_string <unsigned char>一起使用 - Using cout with basic_string<unsigned char>

无符号字符的basic_string值类型 - basic_string of unsigned char Value Type

转换 std::basic_string<Char> 串起来 - Convert std::basic_string<Char> to string

std :: string {aka std :: basic_string <char> 分配给'''char *' - std::string {aka std::basic_string<char>}' to 'char*' in assignment|

将basic_string <unsigned char>转换为basic_string <char>，反之亦然 - Convert basic_string<unsigned char> to basic_string<char> and vice versa

无法从'const std :: __ 1 :: basic_string转换 <char> 到'std :: __ 1 :: basic_string <char> *” - No viable conversion from 'const std::__1::basic_string<char> to 'std::__1::basic_string<char> *'

错误：无法转换 'std::basic_string<char> ' 到 'char' 赋值 - error: cannot convert 'std::basic_string<char>' to 'char' in assignment

ostream和运算符std :: basic_string <char, std::char_traits<char> ，std :: allocator <char> >？ - ostream and operator std::basic_string<char, std::char_traits<char>, std::allocator<char>>?

错误：无法从'std :: string * {aka std :: basic_string转换 <char> *}'为'std :: string {aka std :: basic_string <char> }'| - error: could not convert from 'std::string* {aka std::basic_string<char>*}' to 'std::string {aka std::basic_string<char>}'|

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相关问题 字符串文字转换为basic_string <unsigned char> - String literal to basic_string<unsigned char> 将cout与basic_string <unsigned char>一起使用 - Using cout with basic_string<unsigned char> 无符号字符的basic_string值类型 - basic_string of unsigned char Value Type 转换 std::basic_string<Char> 串起来 - Convert std::basic_string<Char> to string std :: string {aka std :: basic_string <char> 分配给'''char *' - std::string {aka std::basic_string<char>}' to 'char*' in assignment| 将basic_string <unsigned char>转换为basic_string <char>，反之亦然 - Convert basic_string<unsigned char> to basic_string<char> and vice versa 无法从'const std :: __ 1 :: basic_string转换 <char> 到'std :: __ 1 :: basic_string <char> *” - No viable conversion from 'const std::__1::basic_string<char> to 'std::__1::basic_string<char> *' 错误：无法转换 'std::basic_string<char> ' 到 'char' 赋值 - error: cannot convert 'std::basic_string<char>' to 'char' in assignment ostream和运算符std :: basic_string <char, std::char_traits<char> ，std :: allocator <char> >？ - ostream and operator std::basic_string<char, std::char_traits<char>, std::allocator<char>>? 错误：无法从'std :: string * {aka std :: basic_string转换 <char> *}'为'std :: string {aka std :: basic_string <char> }'| - error: could not convert from 'std::string* {aka std::basic_string<char>*}' to 'std::string {aka std::basic_string<char>}'|

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