返回
作用:从序列中删除指定元素。
声明:
#include <algorithm> 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);
#include <iostream> #include <list> #include <string> #include <numeric> #include <iterator> #include <vector> #include <functional> #include <algorithm> 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