multimap::operator= in C++ STL
multimap::operator= is used to assign new contents to the container by replacing the existing contents. It also modifies the size according to the new contents.
Syntax:–
multimap1 = (multimap2) Parameters : Another container of the same type. Result : Assign the contents of the container passed as parameter to the container written on left side of the operator.
Examples:
Input : multimap1 = { ('a', 1), ('b', 2), ('c', 3)} multimap2 = { ('d', 4), ('e', 5), ('f', 6)} multimap1 = multimap2; Output : multimap1 d 4 e 5 f 6 Input : multimap1 = { ('abc', 1), ('bca', 2), ('cab', 3)} multimap2 = { ('def', 4), ('efd', 5), ('fde', 6)} multimap1 = multimap2; Output : multimap1 def 4 efd 5 fde 6
Errors and Exceptions
1. If the containers are of different types, an error is thrown.
2. It has a basic no exception throw guarantee otherwise.
CPP
// CPP Program to illustrate working of // multimap::operator= #include <iostream> #include <map> using namespace std; int main() { // initialise multimap multimap< char , int > m1; multimap< char , int > m2; // iterator for iterate all element of multimap multimap< char , int >::iterator iter; // multimap1 data m1.insert(make_pair( 'a' , 1)); m1.insert(make_pair( 'b' , 2)); m1.insert(make_pair( 'c' , 3)); // multimap2 data m2.insert(make_pair( 'd' , 4)); m2.insert(make_pair( 'e' , 5)); m2.insert(make_pair( 'f' , 6)); // operator= m1 = m2; // multimap1 data cout << "MultiMap 1 data" << "\n" ; for (iter = m1.begin(); iter != m1.end(); iter++) cout << (*iter).first << " " << (*iter).second << "\n" ; } |
Output:-
MultiMap 1 data d 4 e 5 f 6
Time Complexity : O(N)
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