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isdigit

ロケールの要素が数値であるかどうかをテストします。

template<Class CharType>
   bool isdigit(
      CharType _Ch, 
      const locale& _Loc
   )

パラメーター

  • _Ch
    テストする要素。

  • _Loc
    テストされる要素を含むロケール。

戻り値

テストされる要素が数値の場合true ; ある false

解説

このテンプレート関数は use_facet<ctype<CharType>> を返します (_Loc)。です。 (ctype<CharTypeの >::digit、_Ch)。

使用例

// locale_is_digit.cpp
// compile with: /EHsc
#include <locale>
#include <iostream>

using namespace std;

int main( )   
{
   locale loc ( "German_Germany" );
   bool result1 = isdigit ( 'L', loc );
   bool result2 = isdigit ( '@', loc );
   bool result3 = isdigit ( '3', loc );

   if ( result1 )
      cout << "The character 'L' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character 'L' in the locale is "
           << " not a numeric character." << endl;

   if ( result2 )
      cout << "The character '@' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character '@' in the locale is "
           << " not a numeric character." << endl;

   if ( result3 )
      cout << "The character '3' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character '3' in the locale is "
           << " not a numeric character." << endl;
}

出力

The character 'L' in the locale is  not a numeric character.
The character '@' in the locale is  not a numeric character.
The character '3' in the locale is a numeric character.

必要条件

ヘッダー: <locale>

名前空間: std