STL 之remove,remove_if,remove_copy,remove_copy_if
作用:从序列中删除指定元素。
声明:
- #include
- template <class forwardItr,class Type>
- forwardItr remove(forwardItr first, forwardItr last, const Type& value);
- template <class forwardItr, class unaryPredicate>
- forwardItr remove_if(forwardItr first, forwardItr last, unaryPredicate op);
- template <class inputItr,class outputItr,class Type>
- outputItr remove_copy(inputItr first1, inputItr last1, outputItr destFirst, const Type& value);
- template <class inputItr,class outputItr, class unaryPredicate>
- outputItr remove_copy_if(inputItr first1, inputItr last1, outputItr destFirst, unaryPredicate op);
示例代码:
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- using namespace std;
- bool lessThanEqualTo50(int num) {
- return (num <= 50);
- }
- int main() {
- char cList[10] = {'A','a','A','B','A','c','D','e','F','A'};
- vector<char> charList(cList, cList + 10);
- vector<char>::iterator lastElem,newLastElem;
- ostream_iterator<char> screen(cout, " ");
- cout << "charList:" << endl;
- copy(charList.begin(),charList.end(),screen);
- cout << endl;
- // remove:去除容器中的所有的A
- // 函数返回新区间最后一个元素的下一个位置
- lastElem = remove(charList.begin(),charList.end(),'A');
- cout << "charList remove A:" << endl;
- copy(charList.begin(),lastElem,screen);
- cout << endl;
- // remove_if:去掉所有的大写字母
- // 返回新区间的最后一个元素的下一个位置。
- newLastElem = remove_if(charList.begin(),charList.end(),isupper);
- cout << "charList remove if Upper:" << endl;
- // 显示新区间的所有元素
- copy(charList.begin(),newLastElem,screen);
- cout << endl;
- int list[10] = {12,34,56,21,34,78,34,55,12,25};
- vector<int> intList(list,list+10);
- vector<int>::iterator endElement,newEndElement;
- ostream_iterator<int> screenInt(cout, " ");
- cout << "intList:" << endl;
- copy(intList.begin(),intList.end(),screenInt);
- cout << endl;
- vector<int> temp1(10);
- // 将 intList 中除值为34以外的元素,输出到temp1中,不改变 intList。
- endElement = remove_copy(intList.begin(),intList.end(),temp1.begin(),34);
- cout << "temp1:" << endl;
- copy(temp1.begin(),endElement,screenInt);
- cout << endl;
- cout << "intList:" << endl;
- copy(intList.begin(),intList.end(),screenInt);
- cout << endl;
- vector<int> temp2(10,0);
- // remove_copy_if
- // 将intList中大于50的元素输送到 temp2中。
- newEndElement = remove_copy_if(intList.begin(),intList.end(),temp2.begin(),lessThanEqualTo50);
- cout << "temp2:" << endl;
- copy(temp2.begin(),temp2.end(),screenInt);
- cout << endl;
- cout << "temp2:" << endl;
- copy(temp2.begin(),newEndElement,screenInt);
- cout << endl;
- return 0;
- }
运行结果:
charList:
A a A B A c D e F A
charList remove A:
a B c D e F
charList remove if Upper:
a c e e
intList:
12 34 56 21 34 78 34 55 12 25
temp1:
12 56 21 78 55 12 25
intList:
12 34 56 21 34 78 34 55 12 25
temp2:
56 78 55 0 0 0 0 0 0 0
temp2:
56 78 55
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