Library: Localization
Function
Locale convenience function that determines if a character is a space
#include <locale> namespace std { template <class charT> bool isspace(charT c, const locale& loc); }
The isspace() function returns true if the character passed as a parameter is a space character. Otherwise, the function returns false. The check is made using the ctype facet from the locale parameter.
ctype, locale, isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isupper(), isxdigit()
ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 22.1.3.1