public member function
<map>
std::map::crbegin
const_reverse_iterator crbegin() const noexcept;
Return const_reverse_iterator to reverse beginning
Returns a const_reverse_iterator pointing to the last element in the container (i.e., its reverse beginning).
Return Value
A const_reverse_iterator to the reverse beginning of the sequence.
Member type const_reverse_iterator is a reverse bidirectional iterator type that points to a const element (see map member types).
Example
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// map::crbegin/crend
#include <iostream>
#include <map>
int main ()
{
std::map<char,int> mymap;
mymap['b'] = 100;
mymap['a'] = 200;
mymap['c'] = 300;
std::cout << "mymap backwards:";
for (auto rit = mymap.crbegin(); rit != mymap.crend(); ++rit)
std::cout << " [" << rit->first << ':' << rit->second << ']';
std::cout << '\n';
return 0;
}
| |
Output:
mymap backwards: [c:300] [b:100] [a:200]
|
Iterator validity
No changes.
Data races
The container is accessed.
No contained elements are accessed by the call, but the iterator returned can be used to access them. Concurrently accessing or modifying different elements is safe.
Exception safety
No-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.
See also
- map::crend
- Return const_reverse_iterator to reverse end (public member function
)
- map::begin
- Return iterator to beginning (public member function
)
- map::rbegin
- Return reverse iterator to reverse beginning (public member function
)