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Populate a vector with all multimap values with a given key

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伪装坚强ぢ
伪装坚强ぢ 2021-02-08 13:10

Given a multimap M what\'s a neat way to create a vector of all values in M with a specific key.

e.g given a multimap how c

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  • 名媛妹妹
    名媛妹妹 (楼主)
    2021-02-08 13:31

    Here's the way to do it STL style :

    // The following define is needed for select2nd with DinkumWare STL under VC++
#define _HAS_TRADITIONAL_STL 1

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

void main()
{
    typedef multimap MapType;
    MapType m;
    vector v;

    // Test data
    for(int i = 0; i < 10; ++i)
    {
        m.insert(make_pair("123", i * 2));
        m.insert(make_pair("12", i));
    }

    MapType::iterator i = m.lower_bound("123");
    MapType::iterator j = m.upper_bound("123");

    transform(i, j, back_inserter(v), select2nd());

    copy(v.begin(), v.end(),  ostream_iterator(cout, ","));

}

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