std::ctype| Member functions |
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| Member functions of ctype<char> |
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bool is( mask m,char c)const; | (1) | |
constchar* is(constchar* low,constchar* high, mask* vec)const; | (2) | |
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1) Checks if the characterc is classified by the maskm according to the classification table returned by the member functiontable(). Effectively calculatestable()[(unsignedchar)c]& m.
2) For every character in the character array[low, high), reads its full classification mask from the classification table returned by the member functiontable() (that is, evaluatestable()[(unsignedchar)*p] and stores it in the corresponding element of the array pointed to byvec.
If(unsignedchar)c>=std::ctype<char>::table_size, then an implementation-defined value is substituted instead oftable()[(unsignedchar)c], possibly different for different values ofc.
[edit]Parameters
| c | - | character to classify |
| m | - | mask to use for classifying a single character |
| low | - | pointer to the first character in an array of characters to classify |
| high | - | one past the end pointer for the array of characters to classify |
| vec | - | pointer to the first element of the array of masks to fill |
[edit]Return value
1)true ifc is classified bym intable(),false otherwise.
2)high
Unlike the primary templatestd::ctype, this specialization does not perform a virtual function call when classifying characters. To customize the behavior, a derived class may provide a non-default classification table to the base class constructor.
[edit]Example
| This section is incomplete
Reason: no example |
[edit]Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
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| LWG 28 | C++98 | overload (2) copied the values fromvec intotable(),
which is the reverse of the intended behavior | corrected |
[edit]See also
| classifies a character or a character sequence
(virtual protected member function ofstd::ctype<CharT>)[edit] |
