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std::basic_string_view

Defined in header <string_view>
template< 
    class CharT, 
    class Traits = std::char_traits<CharT> 
> class basic_string_view;
(since C++17)

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 <string_view>
Type Definition
std::string_view std::basic_string_view<char>
std::wstring_view std::basic_string_view<wchar_t>
std::u16string_view std::basic_string_view<char16_t>
std::u32string_view std::basic_string_view<char32_t>

Template parameters

CharT - character type
Traits - CharTraits class specifying the operations on the character type. Traits::char_type must name the same type as CharT.

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 constant RandomAccessIterator and ContiguousIterator whose value_type is CharT
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

constructs a basic_string_view
(public member function)
assigns a view
(public member function)
Iterators
returns an iterator to the beginning
(public member function)
returns an iterator to the end
(public member function)
returns a reverse iterator to the beginning
(public member function)
returns a reverse iterator to the end
(public member function)
Element access
access specified character
(public member function)
access specified character with bounds checking
(public member function)
accesses the first character
(public member function)
accesses the last character
(public member function)
returns a pointer to the first character of a view
(public member function)
Capacity
returns the number of characters
(public member function)
returns the maximum number of characters
(public member function)
checks whether the view is empty
(public member function)
Modifers
shrinks the view by moving its start forward
(public member function)
shrinks the view by moving its end backward
(public member function)
swaps the contents
(public member function)
Operations
copies characters
(public member function)
returns a substring
(public member function)
compares two views
(public member function)
find characters in the view
(public member function)
find the last occurrence of a substring
(public member function)
find first occurrence of characters
(public member function)
find last occurrence of characters
(public member function)
find first absence of characters
(public member function)
find last absence of characters
(public member function)

Constants

[static]
special value. The exact meaning depends on the context
(public static member constant)

Non-member functions

lexicographically compares two string views
(function template)
Input/output
performs stream output on string views
(function template)

Literals

Defined in inline namespace std::literals::string_view_literals
(C++17)
Creates a string view of a character array literal
(function)

Helper classes

(C++17)
hash support for string views
(class template specialization)

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