std::basic_ios<CharT,Traits>:: narrow
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C++98/26*
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(C++23)
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C++98/26*
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C++98/26*
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C++98/26*
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(C++11)
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basic_ios::narrow
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(C++11)
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char
narrow
(
char_type c,
char
dfault
)
const
;
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将当前区域设置特定的字符
c
转换为其标准等效形式。如有需要，结果会从
char_type
转换为
char
。如果无法执行转换，函数将返回
dfault
。
等效地调用 std:: use_facet < std:: ctype < char_type > > ( getloc ( ) ) . narrow ( c, dfault ) ; 。
参数
| c | - | 要转换的字符 |
| dfault | - | 转换失败时返回的字符 |
返回值
字符被转换为其标准等价形式后再转为 char 类型。若转换失败则返回 dfault 值。
参见
|
扩展字符
(公开成员函数) |
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调用
do_narrow
(
std::ctype<CharT>
的公开成员函数)
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若可能则将宽字符窄化为单字节窄字符
(函数) |