本地化库
本地环境设施包含字符分类和字符串校对、数值、货币及日期/时间格式化和分析，以及消息取得的国际化支持。本地环境设置控制流 I/O 、正则表达式库和 C++ 标准库的其他组件的行为。
检查字符是否被本地环境分类为图形字符
std::isgraph(std::locale)| template< class charT > |
检查给定字符是否为给定 locale 的 std::ctype 平面分类为图形字符（即可打印字符，除了空格）。
参数
| ch | - | 字符 |
| loc | - | 本地环境 |
返回值
若字符被分类为图形字符则返回 true ，否则返回 false 。
可能的实现
template< class charT >
bool isgraph( charT ch, const std::locale& loc ) {return std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::graph, ch);
}调用示例
#include <iostream>
#include <locale>void try_with(wchar_t c, const char* locale)
{//检查给定字符是否为给定 locale 的 std::ctype 平面分类为图形字符（即可打印字符，除了空格）。std::cout << "isgraph('"<< c<< "', locale(\""<< locale<< "\")) returned "<< std::boolalpha<< std::isgraph(c, std::locale(locale))<< std::endl;
}int main()
{//空格 (0x20, ' ')//换页(0x0c, '\f')//换行(0x0a, '\n')//回车(0x0d, '\r')//水平制表符(0x09, '\t')//垂直制表符(0x0b, '\v')std::cout << std::boolalpha;std::locale locale1; // locale1 是经典 "C" 本地环境的副本std::cout << "locale1.name(): " << locale1.name() << std::endl;std::locale locale2("Chinese (Simplified)_China.936"); // locale2 为本地环境std::cout << "locale2.name(): " << locale2.name() << std::endl;const wchar_t isgraphC = L'\u042f'; // 西里尔大写字母 yatry_with(isgraphC, locale1.name().c_str());try_with(isgraphC, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC2 = '1'; // ASCII '1'try_with(isgraphC2, locale1.name().c_str());try_with(isgraphC2, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC3 = 1; // ASCII 1try_with(isgraphC3, locale1.name().c_str());try_with(isgraphC3, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC4 = 'a'; // ASCII atry_with(isgraphC4, locale1.name().c_str());try_with(isgraphC4, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC5 = ','; // ASCII ','try_with(isgraphC5, locale1.name().c_str());try_with(isgraphC5, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC6 = ' '; // ASCII ' 'try_with(isgraphC6, locale1.name().c_str());try_with(isgraphC6, locale2.name().c_str());std::cout << std::endl;const wchar_t isgraphC7 = '⨌'; //⨌try_with(isgraphC7, locale1.name().c_str());try_with(isgraphC7, locale2.name().c_str());std::cout << std::endl;return 0;
}
输出
locale1.name(): C
locale2.name(): Chinese (Simplified)_China.936
isgraph('1071', locale("C")) returned true
isgraph('1071', locale("Chinese (Simplified)_China.936")) returned trueisgraph('49', locale("C")) returned true
isgraph('49', locale("Chinese (Simplified)_China.936")) returned trueisgraph('1', locale("C")) returned false
isgraph('1', locale("Chinese (Simplified)_China.936")) returned falseisgraph('97', locale("C")) returned true
isgraph('97', locale("Chinese (Simplified)_China.936")) returned trueisgraph('44', locale("C")) returned true
isgraph('44', locale("Chinese (Simplified)_China.936")) returned trueisgraph('32', locale("C")) returned false
isgraph('32', locale("Chinese (Simplified)_China.936")) returned falseisgraph('63', locale("C")) returned true
isgraph('63', locale("Chinese (Simplified)_China.936")) returned true
)
