【转】 std list/vector sort 排序
【转自】http://blog.csdn.net/marising/article/details/4567531
网上江湖郎中和蒙古大夫很多,因此,此类帖子也很多。关于排序,我还真没研究过,看了江湖郎中和蒙古大夫的帖子,搞了半天不行,所以,自己研究了一 下,如下:三种方式都可以,如重写<,()和写比较函数compare_index。但是要注意对象和对象指针的排序区别。
容器中是对象时,用<排序。
容器中是对象指针时,用()和比较函数排序都可以。
list用成员方法sort
vector用sort函数
部分排序
#include<algorithm>
std::partial_sort(.begin(), mid, .end());
class TestIndex{ public: int index; TestIndex(){ } TestIndex(int _index):index(_index){ } bool operator()(const TestIndex* t1,const TestIndex* t2){ printf("Operator():%d,%d/n",t1->index,t2->index); return t1->index < t2->index; } bool operator < (const TestIndex& ti) const { printf("Operator<:%d/n",ti.index); return index < ti.index; } }; bool compare_index(const TestIndex* t1,const TestIndex* t2){ printf("CompareIndex:%d,%d/n",t1->index,t2->index); return t1->index < t2->index; } int main(int argc, char** argv) { list<TestIndex*> tiList1; list<TestIndex> tiList2; vector<TestIndex*> tiVec1; vector<TestIndex> tiVec2; TestIndex* t1 = new TestIndex(2); TestIndex* t2 = new TestIndex(1); TestIndex* t3 = new TestIndex(3); tiList1.push_back(t1); tiList1.push_back(t2); tiList1.push_back(t3); tiList2.push_back(*t1); tiList2.push_back(*t2); tiList2.push_back(*t3); tiVec1.push_back(t1); tiVec1.push_back(t2); tiVec1.push_back(t3); tiVec2.push_back(*t1); tiVec2.push_back(*t2); tiVec2.push_back(*t3); printf("tiList1.sort()/n"); tiList1.sort();//无法正确排序 printf("tiList2.sort()/n"); tiList2.sort();//用<比较 printf("tiList1.sort(TestIndex())/n"); tiList1.sort(TestIndex());//用()比较 printf("sort(tiVec1.begin(),tiVec1.end())/n"); sort(tiVec1.begin(),tiVec1.end());//无法正确排序 printf("sort(tiVec2.begin(),tiVec2.end())/n"); sort(tiVec2.begin(),tiVec2.end());//用<比较 printf("sort(tiVec1.begin(),tiVec1.end(),TestIndex())/n"); sort(tiVec1.begin(),tiVec1.end(),TestIndex());//用()比较 printf("sort(tiVec1.begin(),tiVec1.end(),compare_index)/n"); sort(tiVec1.begin(),tiVec1.end(),compare_index);//用compare_index比较 return 0; }