multiset::operator= in C++ STL
Multisets are a type of associative containers similar to set, with an exception that multiple elements can have same values.
multiset::operator=
This 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 :
multisetname1 = (multisetname2) 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.
set::operator=
This 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 :
setname1 = (setname2) 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 : mymultiset1 = 1, 2, 3 mymultiset2 = 3, 2, 1, 4 mymultiset1 = mymultiset2; Output : mymultiset1 = 3, 2, 1, 4 Input : mymultiset1 = 2, 6, 1, 5 mymultiset2 = 3, 2 mymultiset1 = mymultiset2; Output : mymultiset1 = 3, 2
Input : myset1 = 1, 2, 3 myset2 = 3, 2, 1, 4 myset1 = myset2; Output : myset1 = 3, 2, 1, 4 Input : myset1 = 2, 6, 1, 5 myset2 = 3, 2 myset1 = myset2; Output : myset1 = 3, 2
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
// INTEGER MULTISET EXAMPLE // CPP program to illustrate // Implementation of = operator #include <iostream> #include <set> using namespace std; int main() { multiset< int > mymultiset1{ 1, 7, 4, 9, 0}; multiset< int > mymultiset2{ 3, 4 }; mymultiset1 = mymultiset2; cout << "mymultiset1 = "; for ( auto it = mymultiset1.begin(); it != mymultiset1.end(); ++it) cout << ' ' << *it; return 0; } |
Output:
mymultilist1 = 3 4
CPP
// CHARACTER MULTISET EXAMPLE // CPP program to illustrate // Implementation of = operator #include <iostream> #include <set> using namespace std; int main() { multiset< char > mymultiset1{ 'a' , 'b' , 'c' }; multiset< char > mymultiset2{ 'x' , 'y' }; mymultiset1 = mymultiset2; cout << "mymultiset1 = "; for ( auto it = mymultiset1.begin(); it != mymultiset1.end(); ++it) cout << ' ' << *it; return 0; } |
Output:
mymultilist1 = x y
CPP
// STRING MULTISET EXAMPLE // CPP program to illustrate // Implementation of = operator #include <iostream> #include <set> #include<string> using namespace std; int main() { multiset<string> mymultiset1{ "This","is","a","computer science portal"}; multiset<string> mymultiset2{ "GeeksForGeeks" }; mymultiset1 = mymultiset2; cout << "mymultiset1 = "; for ( auto it = mymultiset1.begin(); it != mymultiset1.end(); ++it) cout << ' ' << *it; return 0; } |
Output:
mymultilist1 = GeeksForGeeks
Time Complexity: O(n)
CPP
// CPP program to illustrate // Implementation of = operator #include <iostream> #include <set> #include<string> using namespace std; int main() { set<string> myset1{ "This","is","a","computer science portal"}; set<string> myset2{ "GeeksForGeeks" }; myset1 = myset2; cout << "myset1 = "; for ( auto it = myset1.begin(); it != myset1.end(); ++it) cout << ' ' << *it; return 0; } |
Output:
mylist1 = GeeksForGeeks
Time Complexity: O(n)
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