C++类(五)——重新审视auto、比较三种for循环的效率、
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| int ids[] = {1,2,3,4,5}
for (auto v: ids){ cout << v; }
for (int i=0; i< sizeof(ids)/sizeof(int); i++) { cout << ids[i]; }
vector<int> group; for (size_t i=0; i< group.size(); i++){ cout << group[i]; }
for (iter= group.begin(); iter != group.end(); iter++){ cout << *iter }
for (auto v: group){ cout << v; }
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