W3cubDocs

/C++

std::basic_string_view<CharT,Traits>::front

constexpr const_reference front() const;
 (since C++17)

Returns reference to the first character in the view. The behavior is undefined if empty() == true.

Parameters

(none).

Return value

Reference to the first character, equivalent to operator[](0).

Complexity

Constant.

Example

#include <iostream>
#include <string_view>
 
int main()
{
    for (std::string_view str{"ABCDEF"}; !str.empty(); str.remove_prefix(1))
        std::cout << str.front() << ' ' << str << '\n';
}

Output:

A ABCDEF
B BCDEF
C CDEF
D DEF
E EF
F F

See also

(C++17)
 accesses the last character
(public member function)
(C++17)
 checks whether the view is empty
(public member function)
(DR*)
 accesses the first character
(public member function of std::basic_string<CharT,Traits,Allocator>)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/string/basic_string_view/front