STL for_each

时间：2010-10-25 来源：wrtrtew

#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
// STL函数for_each(),sort(),random_shuffle()....
using namespace std;
struct Book{
    string title;
    int price;
};
void showBook(Book &b){
    cout << "书名: 《" << b.title << "》价格: " << b.price << endl;
};
bool compareBook(const Book & b1, const Book & b2){
    if (b1.price >= b2.price){// 这里只处理了价格排序
        return true;
    }else
        return false;
}

int main()
{
    Book books[]={{"C Primer Plus",45}, {"C++ Primer Plus",54}, {"深度探索C++对象模型",40}};
    vector<Book> mybooks;// 声明一个空容器变量
    int i;
    for (i=0; i < sizeof(books)/sizeof(Book); i++){
        mybooks.push_back(books[i]);// 向容器尾部插入元素
    };
    cout << "顺序输出：" << endl;
    for_each(mybooks.begin(), mybooks.end(), showBook);// 使用STL函数for_each()
    cout << "排序输出：" << endl;
    sort(mybooks.begin(), mybooks.end(), compareBook);
    for_each(mybooks.begin(), mybooks.end(), showBook);// 使用STL函数for_each()
    cout << "乱序输出：" << endl;
    random_shuffle(mybooks.begin(), mybooks.end());
    for_each(mybooks.begin(), mybooks.end(), showBook);// 使用STL函数for_each()
    return 0;
}