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<cctype>

Defines the macros traditionally defined in the Standard C library header <ctype.h>.

#if <TRADITIONAL C HEADERS>
   #include <ctype.h>
namespace std {
   using ::isalnum; 
   using ::isalpha; 
   using ::iscntrl;
   using ::isdigit; 
   using ::isgraph; 
   using ::islower;
   using ::isprint; 
   using ::ispunct; 
   using ::isspace;
   using ::isupper; 
   using ::isxdigit; 
   using ::tolower;
   using ::toupper;
}

#undef isalnum
#undef isalpha
#undef isblank
#undef iscntrl
#undef isdigit
#undef isgraph
#undef islower
#undef isprint
#undef ispunct
#undef isspace
#undef isupper
#undef isxdigit
#undef tolower
#undef toupper

#endif

Remarks

Including this header also ensures that the names declared with external linkage in the Standard C library header are declared in the std namespace. In this implementation, the names may or may not also be declared in the global namespace, depending on the specific translation environment.

See Also

Reference

Standard C++ Library Overview

Thread Safety in the Standard C++ Library

Other Resources

Header Files