学步园

//代码1

#include <algorithm>
#include <vector>
#include <iostream>
class PrintInt
{
public:
    void operator()(int v)
    {
        std::cout<<v<<" ";
    }
};
int main()
{
    std::vector<int> vec;
    for (int i = 0; i < 10; ++i)
    {
        vec.push_back(i);
    }
    std::for_each(vec.begin(), vec.end(), PrintInt());
    std::cin.get()
    return 0;
}

 

代码2

#include <algorithm>
#include <vector>
#include<iostream>
class PrintInt{
    int base_;
public:
    explicit PrintInt(int b) : base_(b){}
    void operator()(int v)
    {
        std::cout<<v+base_<<" ";
    }
};
int main()
{
    std::vector<int> vec;
    for (int i = 0; i < 10; ++i)
    {
        vec.push_back(i);
    }
    std::for_each(vec.begin(), vec.end(), PrintInt(10));
    std::cin.get();
    return 0;
} 

 

代码3

 

#include <vector>
#include<iostream>
class PrintInt{
    int base_;
public:
    explicit PrintInt(int b) : base_(b){}
    void operator()(int v)
    {
        std::cout<<v+base_<<" ";
    }
};
template<typename It, typename F>
void my_for_each(It beg, It end, F f)
{
    for (; beg != end; ++beg)
    {
        f(*beg);
    }
}
int main()
{
    std::vector<int> vec;
    for (int i = 0; i < 10; ++i)
    {
        vec.push_back(i);
    }
    my_for_each(vec.begin(), vec.end(), PrintInt(10));
    std::cin.get();
    return 0;
} 

 

我认识的高手说:
　　C++STL泛型算法就是基于迭代器和函数对象技术的,迭代器控制作用范围，函数对象作为谓词对元素进行操作
经典经典..........一切都是基本的东西......