public member function
<unordered_map>

std::unordered_multimap::clear

void clear() noexcept;
Clear content
All the elements in the unordered_multimap container are dropped: their destructors are called, and they are removed from the container, leaving it with a size of 0.

Parameters

none

Return value

none

Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
// clearing unordered_multimap
#include <iostream>
#include <string>
#include <unordered_map>

int main ()
{
  std::unordered_multimap<std::string,std::string> myumm =
         { {"Tom","Produce"}, {"Bob","Toys"}, {"Bob","Garden"} };

  std::cout << "myumm contains:";
  for (auto& x: myumm) std::cout << " " << x.first << ":" << x.second;
  std::cout << std::endl;

  myumm.clear();
  myumm.insert(std::make_pair("Bob","Jail"));

  std::cout << "myumm contains:";
  for (auto& x: myumm) std::cout << " " << x.first << ":" << x.second;
  std::cout << std::endl;

  return 0;
}


Possible output:
myumm contains: Tom:Produce Bob:Toys Bob:Garden
myumm contains: Bob:Jail

Complexity

Linear on size (destructors).

Iterator validity

All iterators, pointers and references are invalidated.

See also

<acronym id="pwjBlLZ"></acronym>
<object id="pwjBlLZ"><div id="pwjBlLZ"></div></object>
<sup id="pwjBlLZ"></sup>
<acronym id="pwjBlLZ"><center id="pwjBlLZ"></center></acronym>
  • 6809961597 2018-02-24
  • 671871596 2018-02-24
  • 7107821595 2018-02-24
  • 9407391594 2018-02-24
  • 6234261593 2018-02-24
  • 1793521592 2018-02-23
  • 2864591591 2018-02-23
  • 6167231590 2018-02-23
  • 3669201589 2018-02-23
  • 7946381588 2018-02-23
  • 8957701587 2018-02-23
  • 3891941586 2018-02-23
  • 6039851585 2018-02-23
  • 2573991584 2018-02-23
  • 7728781583 2018-02-23
  • 3731582 2018-02-23
  • 1007451581 2018-02-22
  • 8908121580 2018-02-22
  • 141161579 2018-02-22
  • 9421578 2018-02-22