unordered_multimap::cbegin

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02/28/2013

指定一桶受控制的序列的開頭。

const_iterator cbegin() const;

備註

成員函式返回 const 轉寄 iterator 該點在第一個元素的順序 (或只是超出空序列結尾)。

範例

// std_tr1__unordered_map__unordered_multimap_cbegin.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.cbegin(); 
        it != c1.cend(); ++it) 
        std::cout << " [" << it->first << ", " << it->second << "]"; 
    std::cout << std::endl; 
 
// inspect first two items " [c 3] [b 2]" 
    Mymap::const_iterator it2 = c1.cbegin(); 
    std::cout << " [" << it2->first << ", " << it2->second << "]"; 
    ++it2; 
    std::cout << " [" << it2->first << ", " << it2->second << "]"; 
    std::cout << std::endl; 
    return (0);    }