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std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>:: end, std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>:: cend

From cppreference.net

C++
Containers library
std::flat_map
Member types
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Non-member functions
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iterator end ( ) noexcept ;
(1) (since C++23)
(constexpr since C++26)
const_iterator end ( ) const noexcept ;
(2) (since C++23)
(constexpr since C++26)
const_iterator cend ( ) const noexcept ;
(3) (since C++23)
(constexpr since C++26)

Returns an iterator past the last element of * this .

This returned iterator only acts as a sentinel. It is not guaranteed to be dereferenceable .

range-begin-end.svg

Contents

Return value

Iterator past the last element.

Complexity

Constant.

Example

Run this code 
#include <iostream>
#include <flat_map>
int main()
{
    std::flat_map<int, double> map{{4, 4.13}, {9, 9.24}, {1, 1.09}};
    for (auto it = map.cbegin(); it != map.cend(); ++it)
        std::cout << '[' << it->first << "] = " << it->second << '\n';
    // Unlike std::map's bidirectional iterators, the std::flat_map iterators
    // are random-access, so they can be used with the operator[]:
    auto it = map.cbegin();
    assert(it[0] == map[1]);
    assert(it[1] == map[4]);
    assert(it[2] == map[9]);
}

Output: 

[1] = 1.09
[4] = 4.13
[9] = 9.24

See also

returns an iterator to the beginning
(public member function)
(C++11) (C++14)
returns an iterator to the end of a container or array
(function template)