std::basic_string_view<CharT,Traits>::front - cppreference.com
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    std::basic_string_view<CharT,Traits>::front

    From cppreference.com
     
    C++
     
    Strings library
     
    std::basic_string_view
    Member functions
      
    Iterators
    Capacity
    Operations
    (C++26)
    (C++20)
    (C++20)
    (C++23)
     
    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:

    		(since C++26)

    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