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[classification]
# 28 Text processing library [[text]](./#text)
## 28.3 Localization library [[localization]](localization#classification)
### 28.3.3 Locales [[locales]](locales#classification)
#### 28.3.3.3 Convenience interfaces [[locale.convenience]](locale.convenience#classification)
#### 28.3.3.3.1 Character classification [classification]
[🔗](#lib:isspace)
`template<class charT> bool isspace (charT c, const locale& loc);
template<class charT> bool isprint (charT c, const locale& loc);
template<class charT> bool iscntrl (charT c, const locale& loc);
template<class charT> bool isupper (charT c, const locale& loc);
template<class charT> bool islower (charT c, const locale& loc);
template<class charT> bool isalpha (charT c, const locale& loc);
template<class charT> bool isdigit (charT c, const locale& loc);
template<class charT> bool ispunct (charT c, const locale& loc);
template<class charT> bool isxdigit(charT c, const locale& loc);
template<class charT> bool isalnum (charT c, const locale& loc);
template<class charT> bool isgraph (charT c, const locale& loc);
template<class charT> bool isblank (charT c, const locale& loc);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1240)
Each of these functions is*F* returns the result of the expression:use_facet<ctype<charT>>(loc).is(ctype_base::*F*, c) where *F* is the ctype_base​::​mask value
corresponding to that function ([[category.ctype]](category.ctype "28.3.4.2 The ctype category"))[.](#1.sentence-1)[216](#footnote-216 "When used in a loop, it is faster to cache the ctype&lt;> facet and use it directly, or use the vector form of ctype&lt;>​::​is.")
[216)](#footnote-216)[216)](#footnoteref-216)
When used in a loop,
it is faster to cache the ctype<> facet and use it directly, or
use the vector form of ctype<>​::​is[.](#footnote-216.sentence-1)