vector 查找/查找和对比结构体元素值

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

typedef struct
{
    string str1;
    string str2;
    string str3;
}TASK_INFO_STRU;

bool findx(TASK_INFO_STRU &task)
{
    return task.str2 == "task_two";
}

int main()
{
    vector<TASK_INFO_STRU> task_vector;
    vector<TASK_INFO_STRU>::iterator iter;

    TASK_INFO_STRU task;

    task.str1 = "1";
    task.str2 = "task_one";
    task.str3 = "fine";
    task_vector.push_back(task);

    task.str1 = "2";
    task.str2 = "task_two";
    task.str3 = "fine";
    task_vector.push_back(task);

    iter = find_if(task_vector.begin(), task_vector.end(), findx);
    if (iter != task_vector.end())
    {
        cout << iter->str2 << endl;
        task_vector.erase(iter);
    }

    iter = find_if(task_vector.begin(), task_vector.end(), findx);
    if (iter != task_vector.end())
    {
        cout << iter->str2 << endl;
    }

    return 0;
}

　　

#include <iostream>     // std::cout
#include <algorithm>    // std::find
#include <vector>       // std::vector
bool IsOdd (int i) {
  return ((i%2)==1);
}
int main()
{
    int p[] = {0, 1, 2, 3, 4, 5};
    std::vector<int> myvector( p, p + 6 );
    std::vector<int>::iterator it;
    /** @brief find() example */
    // iterator to vector element:
    it = find( myvector.begin(), myvector.end(), 3 );
    if( it != myvector.end() ) // finded
    {
        std::cout << "The element 3 is found." << '\n';
        // now *it is 3. it is a iterator to int.
        ++it;
        std::cout << "The element following 3 is " << *it << '\n';
    }
    /** @brief find_if() example */
    // iterator to vector element matching some condition.
    it = std::find_if (myvector.begin(), myvector.end(), IsOdd);
    if( it != myvector.end() ) // finded
    {
        std::cout << "The first odd value is " << *it << '\n';
    }
    return 0;
}
find(first, last, val) 查找值为val的元素，返回迭代器
http://www.cplusplus.com/reference/algorithm/find/
find_if(first,last, pred) 查找符合某个条件的元素，返回迭代器
http://www.cplusplus.com/reference/algorithm/find_if/