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Книга: Standard Template Library Programmer

char_traits

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Description
Example
Definition
Template parameters
Model of
Type requirements
Public base classes
Members
New members
See also

char_traits

Category: utilities

Component type: type

Description

The char_traits class is the default Character Traits class used by the library; it is the only predefined Character Traits class.

Example

The char_traits class is of no use by itself. It is used as a template parameter of other classes, such as the basic_string template.

Definition

Defined in the standard header string.

Template parameters

Parameter	Description
charT	char_traits 's value type, i.e.char_traits<>::char_type.

Model of

Character Traits

Type requirements

charT is either char or wchar_t.

(All of char_traits 's member functions are defined for arbitrary types, but some of char_traits 's members must be explicitly specialized if char_traits is to be useful for other types than char and wchar_t.)

Public base classes

None.

Members

All of char_traits 's members are static. There is never any reason to create an object of type char_traits.

Member	Where defined	Description
`char_type`	Character Traits	char_traits's value type: charT.
`int_type`	Character Traits	char_traits's int type.
`pos_type`	Character Traits	char_traits's position type.
`off_type`	Character Traits	char_traits's offset type
`state_type`	Character Traits	char_traits's state type.
`static void assign(char_type& c1, const char_type& c2)`	Character Traits	Assigns c2 to c1.
`static bool eq(const char_type& c1, const char_type& c2)`	Character Traits	Character equality.
`static bool lt(const char_type& c1, const char_type& c2)`	Character Traits	Returns true if c1 is less than c2.
`static int compare(const char_type* p1, const char_type* p2, size_t n)`	Character Traits	Three-way lexicographical comparison, much like strncmp.
`static size_t length(const char* p)`	Character Traits	Returns length of a null-terminated array of characters.
`static const char_type* find(const char_type* p, size_t n, const char_type& c)`	Character Traits	Finds c in [p, p+n) , returning 0 if not found.
`static char_type* move(char_type* s, const char_type* p, size_t n)`	Character Traits	Copies characters from [p, p+n) to the (possibly overlapping) range [s, s+n).
`static char_type* copy(char_type* s, const char_type* p, size_t n)`	Character Traits	Copies characters from [p, p+n) to the (non-overlapping) range [s, s+n).
`static char_type* assign(char_type* s, size_t n, char_type c)`	Character Traits	Assigns the value c to every element in the range [s, s+n).
`static int_type eof()`	Character Traits	Returns the value used as an EOF indicator.
`static int_type not_eof(const int_type& c)`	Character Traits	Returns a value that is not equal to eof() . Returns c unless c is equal to eof().
`static char_type to_char_type(const int_type& c)`	Character Traits	Returns the char_type value corresponding to c, if such a value exists.
`static int_type to_int_type(const char_type& c)`	Character Traits	Returns a int_type representation of c.
`static bool eq_int_type(cosnt int_type& c1, const int_type& c1)`	Character Traits	Tests whether two int_type values are equal. If the values can also be represented as char_type, then eq and eq_int_type must be consistent with each other.

New members

None. All of char_traits's members are defined in the Character Traits requirements.

Книга: Standard Template Library Programmer

char_traits

Разделы на этой странице:

Description

Example

Definition

Template parameters

Model of

Type requirements

Public base classes

Members

New members

See also