NAME¶

std::map::rbegin,std::map::crbegin - std::map::rbegin,std::map::crbegin

Synopsis¶

reverse_iterator rbegin(); (1) (noexcept since C++11)
const_reverse_iterator rbegin() const; (2) (noexcept since C++11)
const_reverse_iterator crbegin() const noexcept; (3) (since C++11)

Returns a reverse iterator to the first element of the reversed map. It corresponds
to the last element of the non-reversed map. If the map is empty, the returned
iterator is equal to rend().

range-rbegin-rend.svg

Parameters¶

(none)

Return value¶

Reverse iterator to the first element.

Complexity¶

Constant.

Notes¶

The underlying iterator of the returned reverse iterator is the end iterator. Hence
the returned iterator is invalidated if and when the end iterator is invalidated.

libc++ backports crbegin() to C++98 mode.

Example¶

// Run this code

#include <iomanip>
#include <iostream>
#include <string_view>
#include <map>

int main()
{
const std::map<int, std::string_view> coins
{
{10, "dime"},
{100, "dollar"},
{50, "half dollar"},
{5, "nickel"},
{1, "penny"},
{25, "quarter"}
}; // initializer entries in name alphabetical order

std::cout << "US coins in circulation, largest to smallest denomination:\n";
for (auto it = coins.crbegin(); it != coins.crend(); ++it)
std::cout << std::setw(11) << it->second << " = ¢" << it->first << '\n';
}

Output:¶

US coins in circulation, largest to smallest denomination:
dollar = ¢100
half dollar = ¢50
quarter = ¢25
dime = ¢10
nickel = ¢5
penny = ¢1

See also¶

rend returns a reverse iterator to the end
crend (public member function)
(C++11)
rbegin returns a reverse iterator to the beginning of a container or array
crbegin (function template)
(C++14)