- The C Standard Library
- The C Standard Library
- The C++ Standard Library
- C++ Library - Home
- C++ Library - <fstream>
- C++ Library - <iomanip>
- C++ Library - <ios>
- C++ Library - <iosfwd>
- C++ Library - <iostream>
- C++ Library - <istream>
- C++ Library - <ostream>
- C++ Library - <sstream>
- C++ Library - <streambuf>
- C++ Library - <atomic>
- C++ Library - <complex>
- C++ Library - <exception>
- C++ Library - <functional>
- C++ Library - <limits>
- C++ Library - <locale>
- C++ Library - <memory>
- C++ Library - <new>
- C++ Library - <numeric>
- C++ Library - <regex>
- C++ Library - <stdexcept>
- C++ Library - <string>
- C++ Library - <thread>
- C++ Library - <tuple>
- C++ Library - <typeinfo>
- C++ Library - <utility>
- C++ Library - <valarray>
- The C++ STL Library
- C++ Library - <array>
- C++ Library - <bitset>
- C++ Library - <deque>
- C++ Library - <forward_list>
- C++ Library - <list>
- C++ Library - <map>
- C++ Library - <queue>
- C++ Library - <set>
- C++ Library - <stack>
- C++ Library - <unordered_map>
- C++ Library - <unordered_set>
- C++ Library - <vector>
- C++ Library - <algorithm>
- C++ Library - <iterator>
- C++ Programming Resources
- C++ Programming Tutorial
- C++ Useful Resources
- C++ Discussion
C++ Map Library - insert() Function
Description
The C++ function std::multimap::insert() extends container by inserting new element in multimap by using move semantics. This function increases container size by one.
Declaration
Following is the declaration for std::multimap::insert() function form std::map header.
C++11
template <class P> iterator insert (const_iterator position, P&& val);
Parameters
position − Hint for the position to insert element.
val − value to be inserted.
Return value
Returns an iterator pointing to the newly inserted element.
Exceptions
No effect on container if exception is thrown.
Time complexity
Logarithmic i.e. O(log n)
Example
The following example shows the usage of std::multimap::insert() function.
#include <iostream> #include <map> using namespace std; int main(void) { /* Multimap with duplicates */ multimap<char, int> m { {'a', 1}, {'a', 2}, {'b', 3}, {'c', 4}, }; auto pos = m.insert(m.begin(), move(pair<char, int>('a', 0))); cout << "After inserting new element iterator points to" << endl; cout << pos->first << " = " << pos->second << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
After inserting new element iterator points to a = 0
map.htm
Advertisements