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std::basic_string_view::front(3) C++ Standard Libary std::basic_string_view::front(3)

NAME

std::basic_string_view::front - std::basic_string_view::front

Synopsis


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

// 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


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

2024.06.10 http://cppreference.com