VisualC++ + HASHMultIMAP没有发现任何结果

我需要一些帮助来理解stdext::hash\u multimap的下限、上限和相等范围是如何工作的(至少是VS2005版本)。

我有以下代码(问题摘要)

#include <hash_map>

using stdext::hash_multimap;
using std::greater;
using stdext::hash_compare;
using std::pair;
using std::cout;

typedef hash_multimap < double, CComBSTR, hash_compare< double, greater<double> > > HMM;
HMM hm1;
HMM :: const_iterator it1, it2;
pair<HMM::const_iterator, HMM::const_iterator> pairHMM;

typedef pair <double, CComBSTR> PairDblStr;

// inserting only two values for sample
hm1.insert ( PairDblStr ( 0.224015748, L"#1-64" ) );
hm1.insert ( PairDblStr ( 0.215354331, L"#1-72" ) );

// Using a double value in between the inserted key values to find one of the elements in the map
it1 = hm1.lower_bound( 0.2175 );

if( it1 == hm1.end() )
{
    cout << "lower_bound failed\n";
}

it1 = hm1.upper_bound( 0.2175 );

if( it1 == hm1.end() )
{
    cout << "upper_bound failed\n";
}

pairHMM = hm1.equal_range( 0.2175 );
if( ( pairHMM.first == hm1.end() ) && ( pairHMM.second == hm1.end() ) )
{
    cout << "equal_range failed\n";
}

lower_bound failed
upper_bound failed
equal_range failed

提前谢谢你的帮助。

感谢@billy oneal@dauphic的评论和编辑。我已经更新了上面的代码,使其可编译和可运行(当然,一旦包含了正确的头)。