CHAPTER10-30.cpp
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上传日期:2007-07-03
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- //文件名:CHAPTER10-30.cpp
- #include <map>
- #include <iostream>
- #if _MSC_VER > 1020 // if VC++ version is > 4.2
- using namespace std; // std c++ libs implemented in std
- #endif
- int main( )
- {
- typedef multimap <int, int, less<int> > IntMMap;
- IntMMap m1;
- multimap <int, int> :: const_iterator m1_RcIter;
- typedef pair <int, int> Int_Pair;
- m1.insert ( Int_Pair ( 1, 10 ) );
- m1.insert ( Int_Pair ( 2, 20 ) );
- m1.insert ( Int_Pair ( 3, 30 ) );
- pair <IntMMap::const_iterator, IntMMap::const_iterator> p1, p2;
- p1 = m1.equal_range( 2 );
- cout << "The lower bound of the element with "
- << "a key of 2 in the multimap m1 is: "<< p1.first -> second << "." << endl;
- cout << "The upper bound of the element with "
- << "a key of 2 in the multimap m1 is: "<< p1.second -> second << "." << endl;
- // Compare the upper_bound called directly
- m1_RcIter = m1.upper_bound( 2 );
- cout << "A direct call of upper_bound( 2 ) gives "
- << m1_RcIter -> second << "," << endl<< " matching the 2nd element of the pair"
- << " returned by equal_range( 2 )." << endl;
- p2 = m1.equal_range( 4 );
- // If no match is found for the key, both elements of the pair return end( )
- if ( ( p2.first == m1.end( ) ) && ( p2.second == m1.end( ) ) )
- cout << "The multimap m1 doesn't have an element "<< "with a key less than 4." << endl;
- else
- cout << "The element of multimap m1 with a key >= 40 is: "<< p1.first -> first << "." << endl;
- }