std::multimap<Key,T,Compare,Allocator>::rbegin,std::multimap<Key,T,Compare,Allocator>::crbegin
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std::multimap
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reverse_iterator rbegin(); | (1) | (noexcept since C++11) (constexpr since C++26) |
const_reverse_iterator rbegin()const; | (2) | (noexcept since C++11) (constexpr since C++26) |
const_reverse_iterator crbegin()constnoexcept; | (3) | (since C++11) (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 torend().
Contents |
[edit]Return value
Reverse iterator to the first element.
[edit]Complexity
Constant.
[edit]Notes
Theunderlying iterator of the returned reverse iterator is theend iterator. Hence the returned iterator is invalidated if and when the end iterator is invalidated.
libc++ backportscrbegin() to C++98 mode.
[edit]Example
Run this code
#include <algorithm>#include <iostream>#include <string>#include <map> int main(){std::multimap<std::string,int> map{{"█",1},{"▒",5},{"░",3},{"▓",7},{"▓",8},{"░",4},{"▒",6},{"█",2}}; std::cout<<"Print out in reverse order using const reverse iterators:\n";std::for_each(map.crbegin(), map.crend(),[](std::pair<conststd::string,int>const& e){std::cout<<"{\""<< e.first<<"\", "<< e.second<<" };\n";}); map.rbegin()->second=42;// OK, non-const value is modifiable// map.crbegin()->second = 42; // Error: cannot modify the const value}
Possible output:
Print out in reverse order using const reverse iterators:{ "▓", 8 };{ "▓", 7 };{ "▒", 6 };{ "▒", 5 };{ "░", 4 };{ "░", 3 };{ "█", 2 };{ "█", 1 };[edit]See also
(C++11) | returns a reverse iterator to the end (public member function)[edit] |
(C++14) | returns a reverse iterator to the beginning of a container or array (function template)[edit] |
