protected virtual member function
<locale>
std::ctype::do_narrow
| 单个字符 (1) | char do_narrow (char_type c, char dfault) const; |
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| 序列 (2) | const char_type* do_narrow (const char_type* low, const char_type* high, char dfault, char* to) const; |
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Narrow character(s) [virtual]
Virtual protected member function called by ctype::narrow to transform characters of the type managed by the facet into their char equivalents.
Polymorphic derived classes can overwrite the behavior of this function.
See ctype::narrow for its default behavior in ctype.