From cppreference.com
iteratorbegin()noexcept; (1) (since C++23)const_iteratorbegin()constnoexcept; (2) (since C++23)const_iteratorcbegin()constnoexcept; (3) (since C++23)Returns an iterator to the first element of the flat_multimap.
If the flat_multimap is empty, the returned iterator will be equal to end().
Return value
Iterator to the first element.
Complexity
Constant.
Example
Run this code
#include<iostream>#include<flat_map>intmain(){std::flat_multimap<int,int>map{{4,13},{9,94},{1,19},{4,42}};for(autoit=map.cbegin();it!=map.cend();++it)std::cout<<'['<<it->first<<"] = "<<it->second<<'\n';// Unlike std::multimap's bidirectional iterators, the std::flat_multimap// iterators are random-access, so they can be used with the operator[]:autoit=map.cbegin();assert(it[1]==19);assert(it[4]==13);assert(it[4]==42);assert(it[9]==94);}Output:
[1] = 19 [4] = 13 [4] = 42 [9] = 94 See also
returns an iterator to the end
(public member function)
(C++11)(C++14)
returns an iterator to the beginning of a container or array
(function template)