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

From cppreference.net
C++
Strings library
std::basic_string_view
constexpr const_reference front ( ) const ;
(since C++17)

Returns reference to the first character in the view.

If empty() is true , the behavior is undefined.

(until C++26)

If empty() is true :

  • If the implementation is hardened , a contract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
  • If the implementation is not hardened, the behavior is undefined.
(since C++26)

Contents

Return value

data_ [ 0 ]

Complexity

Constant.

Example

Run this code 
#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

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