vector::difference_type

提供參考相同向量中項目之兩個迭代器間差異的類型。

typedef typename Allocator::difference_type difference_type;

備註

difference_type 也可以兩個指標之間的項目數來描述。

迭代器通常可用來存取向量項目。

範例

// vector_diff_type.cpp
// compile with: /EHsc
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;


int main()
{
    vector <int> vec;
    vector <int>::iterator it_1, it_2;

    // A vector with non-sequential values
    vec.push_back(21);
    vec.push_back(26);
    vec.push_back(98);
    vec.push_back(4);
    vec.push_back(79);
    vec.push_back(46);
    vec.push_back(69);    

    // How far apart are 98 and 46 in the vector?
    // (Making several assumptions for the sake of simplicity.)
    it_1 = std::find(vec.begin(), vec.end(), 98);
    it_2 = std::find(vec.begin(), vec.end(), 46);    
    vector <int>::difference_type distance = it_2 - it_1;
    cout << "The value 46 occurs " << distance << " elements after the value 96." << endl;
}}

需求

標頭：<vector>

命名空間: std

請參閱

參考

vector 類別

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