- 常用遍历算法
- for_each
- 用于遍历
- 有返回值
- 可以绑定参数进行输出
- transform
- 搬运
- 注意：目标容器要有容量
#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;
#include <vector>
#include <algorithm>
#include <functional>
class MyPrint
{
public:
void operator()(int val)
{
cout << val << endl;
m_Count++;
}
int m_Count = 0;
};
//for_each 用于遍历
//有返回值的
void test01()
{
vector<int>v;
for (int i = 0; i < 10;i++)
{
v.push_back(i);
}
MyPrint print = for_each(v.begin(), v.end(), MyPrint());
cout << "print.count = " << print.m_Count << endl;
}
//for_each可以绑定参数输出
class MyPrint2 :public binary_function<int,int,void>
{
public:
void operator()(int val , int start) const
{
cout << val << endl;
}
};
void test02()
{
vector<int>v;
for (int i = 0; i < 10; i++)
{
v.push_back(i);
}
for_each(v.begin(), v.end(), bind2nd( MyPrint2(), 1000));
}
//transform算法 将指定容器区间元素搬运到另一容器中
class MyTransform
{
public:
int operator()(int val)
{
return val + 10000;
}
};
void test03()
{
vector<int>v;
for (int i = 0; i < 10; i++)
{
v.push_back(i);
}
vector<int>v2;
v2.resize(v.size());
transform(v.begin(), v.end(), v2.begin(), MyTransform());
for_each(v2.begin(), v2.end(), [](int val){cout << val << " "; });
}
int main(){
//test01();
//test02();
test03();
system("pause");
return EXIT_SUCCESS;
}
