Question

C++中multimap容器中的内容进行文件读写 100分，100分，答得好还加

代码如下定义：

string cell,attribute,value;
multimap <string,pair<string,string> > temptable1;

我已经可以向里面插入数据并查找了
但问题是，我不知道怎么控制格式，对其内部内容进行查找了和读写
有求各位侠士了。尽快要，请给我代码和思想知道，谢谢
初学者
那上面的三个不 cell ,attribute 和value ,attribute为 其multimap 的键值
cell 和 value 是multimap中的pair 对象的两个组成元素。谢谢

Answer 1

你如果不是很了解的话，就先从简单数据类型组成的multimap想起。
下面是MSDN上的一段代码，希望能帮助你理解它的查找和读写。
#include <map>
#include <iostream>

int main( )
{
using namespace std;
typedef pair <int, int> Int_Pair;
multimap <int, int>::iterator m1_Iter, m3_Iter, m4_Iter, m5_Iter, m6_Iter;
multimap <int, int, greater<int> >::iterator m2_Iter;

// Create an empty multimap m0 of key type integer
multimap <int, int> m0;

// Create an empty multimap m1 with the key comparison
// function of less than, then insert 4 elements
multimap <int, int, less<int> > m1;
m1.insert( Int_Pair( 1, 10 ) );
m1.insert( Int_Pair( 2, 20 ) );
m1.insert( Int_Pair( 3, 30 ) );
m1.insert( Int_Pair( 4, 40 ) );

// Create an empty multimap m2 with the key comparison
// function of geater than, then insert 2 elements
multimap <int, int, greater<int> > m2;
m2.insert( Int_Pair( 1, 10 ) );
m2.insert( Int_Pair( 2, 20 ) );

// Create a multimap m3 with the
// allocator of multimap m1
multimap <int, int>::allocator_type m1_Alloc;
m1_Alloc = m1.get_allocator( );
multimap <int, int> m3( less<int>( ), m1_Alloc );
m3.insert( Int_Pair( 3, 30 ) );

// Create a copy, multimap m4, of multimap m1
multimap <int, int> m4( m1 );

// Create a multimap m5 by copying the range m1[_First, _Last)
multimap <int, int>::const_iterator m1_bcIter, m1_ecIter;
m1_bcIter = m1.begin( );
m1_ecIter = m1.begin( );
m1_ecIter++;
m1_ecIter++;
multimap <int, int> m5( m1_bcIter, m1_ecIter );

// Create a multimap m6 by copying the range m4[_First, _Last)
// and with the allocator of multimap m2
multimap <int, int>::allocator_type m2_Alloc;
m2_Alloc = m2.get_allocator( );
multimap <int, int> m6(m4.begin( ), ++m4.begin( ), less<int>( ), m2_Alloc);

cout << "m1 =";
for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ )
cout << " " << m1_Iter -> second;
cout << endl;

cout << "m2 =";
for ( m2_Iter = m2.begin( ); m2_Iter != m2.end( ); m2_Iter++ )
cout << " " << m2_Iter -> second;
cout << endl;

cout << "m3 =";
for ( m3_Iter = m3.begin( ); m3_Iter != m3.end( ); m3_Iter++ )
cout << " " << m3_Iter -> second;
cout << endl;

cout << "m4 =";
for ( m4_Iter = m4.begin( ); m4_Iter != m4.end( ); m4_Iter++ )
cout << " " << m4_Iter -> second;
cout << endl;

cout << "m5 =";
for ( m5_Iter = m5.begin( ); m5_Iter != m5.end( ); m5_Iter++ )
cout << " " << m5_Iter -> second;
cout << endl;

cout << "m6 =";
for ( m6_Iter = m6.begin( ); m6_Iter != m6.end( ); m6_Iter++ )
cout << " " << m6_Iter -> second;
cout << endl;
}