unordered_set::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_set__unordered_set_cbegin.cpp 
// compile with: /EHsc 
#include <unordered_set> 
#include <iostream> 
 
typedef std::unordered_set<char> Myset; 
int main() 
    { 
    Myset c1; 
 
    c1.insert('a'); 
    c1.insert('b'); 
    c1.insert('c'); 
 
// display contents " [c] [b] [a]" 
    for (Myset::const_iterator it = c1.cbegin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
// inspect first two items " [c] [b]" 
    Myset::const_iterator it2 = c1.cbegin(); 
    std::cout << " [" << *it2 << "]"; 
    ++it2; 
    std::cout << " [" << *it2 << "]"; 
    std::cout << std::endl; 
    }