std::experimental:: basic_string_view

Defined in header <experimental/string_view>
template < class CharT, class Traits = std:: char_traits < CharT > > class basic_string_view ;		(library fundamentals TS)

The class template basic_string_view describes an object that can refer to a constant contiguous sequence of char -like objects with the first element of the sequence at position zero.

A typical implementation holds only two members: a pointer to constant CharT and a size.

Several typedefs for common character types are provided:

Defined in header <experimental/string_view>
Type	Definition
std::experimental::string_view	std :: experimental :: basic_string_view < char >
std::experimental::wstring_view	std :: experimental :: basic_string_view < wchar_t >
std::experimental::u16string_view	std :: experimental :: basic_string_view < char16_t >
std::experimental::u32string_view	std :: experimental :: basic_string_view < char32_t >

Template parameters

CharT	-	character type
Traits	-	traits class specifying the operations on the character type

Member types

Member type	Definition
traits_type	Traits
value_type	CharT
pointer	CharT*
const_pointer	const CharT*
reference	CharT&
const_reference	const CharT&
const_iterator	implementation-defined LegacyRandomAccessIterator
iterator	const_iterator
reverse_iterator	const_reverse_iterator
const_reverse_iterator	std:: reverse_iterator < const_iterator >
size_type	std::size_t
difference_type	std::ptrdiff_t

Note: iterator and const_iterator are the same type because string views are views into constant character sequences.

Member functions

(constructor)	constructs a basic_string_view (public member function)
operator=	assigns a view (public member function)
Iterators
begin cbegin	returns an iterator to the beginning (public member function)
end cend	returns an iterator to the end (public member function)
rbegin crbegin	returns a reverse iterator to the beginning (public member function)
rend crend	returns a reverse iterator to the end (public member function)
Element access
operator[]	access specified character (public member function)
at	access specified character with bounds checking (public member function)
front	accesses the first character (public member function)
back	accesses the last character (public member function)
data	returns a pointer to the first character of a view (public member function)
Capacity
size length	returns the number of characters (public member function)
max_size	returns the maximum number of characters (public member function)
empty	checks whether the view is empty (public member function)
Modifiers
remove_prefix	shrinks the view by moving its start forward (public member function)
remove_suffix	shrinks the view by moving its end backward (public member function)
swap	swaps the contents (public member function)
Operations
to_string operator basic_string	creates a string from the view (public member function)
copy	copies characters (public member function)
substr	returns a substring (public member function)
compare	compares two views (public member function)
find	find characters in the view (public member function)
rfind	find the last occurrence of a substring (public member function)
find_first_of	find first occurrence of characters (public member function)
find_last_of	find last occurrence of characters (public member function)
find_first_not_of	find first absence of characters (public member function)
find_last_not_of	find last absence of characters (public member function)
Constants
npos [static]	special value. The exact meaning depends on the context (public static member constant)

Non-member functions

operator== operator!= operator< operator> operator<= operator>=	lexicographically compares two views (function template)
Input/output
operator<<	performs stream output on views (function template)

Helper classes

std::hash <std::experimental::string_view> std::hash <std::experimental::wstring_view> std::hash <std::experimental::u16string_view> std::hash <std::experimental::u32string_view>

hash support for views (class template specialization)

Feature test macros

__cpp_lib_experimental_string_view

a value of at least 201411 indicates that basic_string_view template is supported (macro constant)