std::ctype::toupper
Defined in header <locale> | ? | ? |
|---|---|---|
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'?');
try_upper(f, L'?');
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 '?' is S
'?' 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) |
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