copy //容器内指定范围的元素拷贝到另一个容器中
replace //将容器内指定范围的旧元素修改为新元素
replace_if //容器内指定范围满足条件的元素替换为新元素
swap //互换两个容器的元素
(1)copy
函数原型:
copy(iterator beg,iterator end,iterator dest);
示例:
class myPrint{
public:
void operator()(int val){
cout<<val<<" ";
}
};
void test01(){
vector<int>v1;
for(int i = 0;i<10;i++){
v1.push_back(i);
}
//目标容器
vector<int>v2;
v2.resize(v1.size());
copy(v1.begin(),v1.end(),v2.begin());
for_each(v2.begin(),v2.end(),myPrint());
cout<<endl;
}
(2)replace和replace_if
将容器内指定范围的旧元素修改为新元素
replace(iterator beg,iterator end,oldvalue,newvalue);
将区间内满足田间的元素,替换成指定元素,
replace(iterator beg,iterator end,_pred,newvalue);
示例:
class myPrint{
public:
void operator()(int val){
cout<<val<<" ";
}
};
class Greater20To3000{
public:
bool operator()(int value){
return value>20;
}
};
void test01(){
vector<int>v1;
v1.push_back(20);
v1.push_back(30);
v1.push_back(40);
v1.push_back(10);
v1.push_back(70);
v1.push_back(50);
v1.push_back(90);
v1.push_back(80);
v1.push_back(30);
cout<<"替换前: ";
for_each(v1.begin(),v1.end(),myPrint());
cout<<endl;
//将30替换成2000
replace(v1.begin(),v1.end(),30,2000);
cout<<"普通替换后: " ;
for_each(v1.begin(),v1.end(),myPrint());
cout<<endl;
//把大于20的替换成3000
replace_if(v1.begin(),v1.end(),Greater20To3000(),3000);
cout<<"按条件替换后: " ;
for_each(v1.begin(),v1.end(),myPrint());
cout<<endl;
}
(3)swap
互换两个同种元素的元素
函数原型:
swap(容器1,容器2);
class myPrint{
public:
void operator()(int val){
cout<<val<<" ";
}
};
void test01(){
vector<int>v1;
v1.push_back(20);
v1.push_back(30);
v1.push_back(40);
v1.push_back(10);
v1.push_back(70);
v1.push_back(50);
v1.push_back(90);
v1.push_back(80);
v1.push_back(30);
vector<int>v2;
for(int i=0;i<10;i++){
v2.push_back(i);
}
cout<<"--------交换前-------------: "<<endl;
cout<<"v1:";
for_each(v1.begin(),v1.end(),myPrint());
cout<<endl;
cout<<"v2:";
for_each(v2.begin(),v2.end(),myPrint());
cout<<endl;
swap(v1,v2);
cout<<"----------交换后-------------:"<<endl;
cout<<"v1:";
for_each(v1.begin(),v1.end(),myPrint());
cout<<endl;
cout<<"v2:";
for_each(v2.begin(),v2.end(),myPrint());
cout<<endl;
}