std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>:: rbegin, std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>:: crbegin
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reverse_iterator rbegin
(
)
noexcept
;
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(1) |
(since C++23)
(constexpr since C++26) |
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const_reverse_iterator rbegin
(
)
const
noexcept
;
|
(2) |
(since C++23)
(constexpr since C++26) |
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const_reverse_iterator crbegin
(
)
const
noexcept
;
|
(3) |
(since C++23)
(constexpr since C++26) |
Returns a reverse iterator to the first element of the reversed * this . It corresponds to the last element of the non-reversed * this .
If * this is empty, the returned iterator is equal to rend() .
Contents |
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.
Example
#include <iomanip> #include <iostream> #include <string_view> #include <flat_map> int main() { const std::flat_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
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returns a reverse iterator to the end
(public member function) |
|
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(C++14)
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returns a reverse iterator to the beginning of a container or array
(function template) |