std::ctype::toupper
STD：：Ctype：：Touch，STD：：Ctype：：Do[医]触头
| Defined in header | | |
|---|---|---|
| public: CharT toupper( CharT c ) const; | (1) | |
| public: const CharT* toupper( CharT* beg, const CharT* end ) const; | (2) | |
| protected: virtual CharT do_toupper( CharT c ) const; | (3) | |
| protected: virtual const CharT* do_toupper( CharT* beg, const CharT* end ) const; | (4) | |
1，2%29的公共成员函数，调用受保护的虚拟成员函数。do_toupper最派生的类。
3%29转换字符c如果大写窗体由此区域设置定义，则为大写。
4%29对字符数组中的每个字符[beg, end)，如果存在大写形式，则将字符替换为该大写形式。
参数
| c | - | character to convert |
|---|---|---|
| beg | - | pointer to the first character in an array of characters to convert |
| end | - | one past the end pointer for the array of characters to convert |
返回值
1，3%29大写字符或c如果此区域设置没有列出大写形式。
2，4%29end...
注记
这个函数只能执行01：1的字符映射，例如，大写形式%27%27是%28，但有一些例外，即双字符字符串“ss”，它不能由do_toupper...
例
二次
#include <locale>
#include <iostream>
void try_upper(const std::ctype<wchar_t>& f, wchar_t c)
{
wchar_t up = f.toupper(c
if (up != c) {
std::wcout << "Upper case form of \'" << c << "' is " << up << '\n';
} else {
std::wcout << '\'' << c << "' has no upper case form\n";
}
}
int main()
{
std::locale::global(std::locale("en_US.utf8")
std::wcout.imbue(std::locale()
std::wcout << "In US English UTF-8 locale:\n";
auto& f = std::use_facet<std::ctype<wchar_t>>(std::locale()
try_upper(f, L's'
try_upper(f, L'ſ'
try_upper(f, L'ß'
std::wstring str = L"Hello, World!";
std::wcout << "Uppercase form of the string '" << str << "' is ";
f.toupper(&str[0], &str[0] + str.size()
std::wcout << "'" << str << "'\n";
}
二次
产出：
二次
In US English UTF-8 locale:
Upper case form of 's' is S
Upper case form of 'ſ' is S
'ß' has no upper case form
Uppercase form of the string 'Hello, World!' is 'HELLO, WORLD!'
二次
另见
| tolower | invokes do_tolower (public member function) |
|---|---|
| toupper | converts a character to uppercase (function) |
| towupper | converts a wide character to uppercase (function) |
© cppreference.com
在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
