所以,自己研究了一下,如下:三種方式都可以,如重寫<,()和寫比較函數compare_index。但是要注意對象和對象指針的排序區別。
1、容器中是對象時,用操作符<或者比較函數,比較函數參數是引用。
2、容器中是對象指針時,用()和比較函數排序都可以,比較函數參數是指針。
3、list用成員方法sort
4、vector用sort函數
- 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();//無法正確排序
- printf("tiList2.sort()/n");
- tiList2.sort();//用<比較
- printf("tiList1.sort(TestIndex())/n");
- tiList1.sort(TestIndex());//用()比較
- printf("sort(tiVec1.begin(),tiVec1.end())/n");
- sort(tiVec1.begin(),tiVec1.end());//無法正確排序
- printf("sort(tiVec2.begin(),tiVec2.end())/n");
- sort(tiVec2.begin(),tiVec2.end());//用<比較
- printf("sort(tiVec1.begin(),tiVec1.end(),TestIndex())/n");
- sort(tiVec1.begin(),tiVec1.end(),TestIndex());//用()比較
- printf("sort(tiVec1.begin(),tiVec1.end(),compare_index)/n");
- sort(tiVec1.begin(),tiVec1.end(),compare_index);//用compare_index比較
- return 0;
- }