unordered_multimap::begin

發行項
02/28/2013

指定一桶受控制的序列的開頭。

iterator begin();
const_iterator begin() const;
local_iterator begin(size_type nbucket);
const_local_iterator begin(size_type nbucket) const;

參數

參數	描述
nbucket	值區數目。

備註

第一個的兩個成員函式會傳回正 iterator 該點在第一個元素的順序 (或只是超出空序列結尾)。最後兩個成員函式會傳回正 iterator 桶的第一個項目在該點nbucket (或只是超出空的值區結尾)。

範例

// std_tr1__unordered_map__unordered_multimap_begin.cpp 
// compile with: /EHsc 
#include <unordered_map> 
#include <iostream> 
 
typedef std::unordered_multimap<char, int> Mymap; 
int main() 
    { 
    Mymap c1; 
 
    c1.insert(Mymap::value_type('a', 1)); 
    c1.insert(Mymap::value_type('b', 2)); 
    c1.insert(Mymap::value_type('c', 3)); 
 
// display contents " [c 3] [b 2] [a 1]" 
    for (Mymap::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << it->first << ", " << it->second << "]"; 
    std::cout << std::endl; 
 
// inspect first two items " [c 3] [b 2]" 
    Mymap::iterator it2 = c1.begin(); 
    std::cout << " [" << it2->first << ", " << it2->second << "]"; 
    ++it2; 
    std::cout << " [" << it2->first << ", " << it2->second << "]"; 
    std::cout << std::endl; 
 
// inspect bucket containing 'a' 
    Mymap::const_local_iterator lit = c1.begin(c1.bucket('a')); 
    std::cout << " [" << lit->first << ", " << lit->second << "]"; 
 
    return (0); 
    }