function template
<locale>
std::isgraph
template <class charT> bool isgraph (charT c, const locale& loc);
Check if character has graphical representation using locale
Checks whether c has graphical representation using the ctype facet of locale loc, returning the same as if ctype::is is called as
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use_facet < ctype<charT> > (loc).is (ctype_base::graph, c)
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This function template overloads the C function isgraph (defined in <cctype>).
参数
- c
- 要检查的字符。
- loc
- 要使用的 locale。它必须具有 ctype 方面。
模板参数 charT 是字符类型。
返回值
true if indeed c has graphical representation.
否则返回 false。
示例
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// isgraph example (C++)
#include <iostream> // std::cout
#include <fstream> // std::ifstream
#include <locale> // std::locale, std::isgraph
int main ()
{
std::locale loc;
std::ifstream myfile ("myfile.txt");
char c;
while (myfile.good())
{
myfile >> c;
if (std::isgraph(c,loc)) std::cout << c;
}
myfile.close();
return 0;
}
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This example prints out the contents of myfile.txt without spaces and special characters, i.e. only prints out the characters that qualify as isgraph.