vector::clear ，vector::crbegin （c++11），vector::crend（c++11）

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vector::clear

// clearing vectors#include <iostream>#include <vector>using namespace std;int main (){  vector<int> myvector;  myvector.push_back (100);  myvector.push_back (200);  myvector.push_back (300);  cout << "myvector contains:";  for (unsigned i=0; i<myvector.size(); i++)    cout << ' ' << myvector[i];  cout << '\n';  myvector.clear(); //清除了容器里的内存   myvector.push_back (1101);  myvector.push_back (2202);  cout << "myvector contains:";  for (unsigned i=0; i<myvector.size(); i++)    cout << ' ' << myvector[i];     cout << '\n';  return 0;}

vector::crbegin

（C++ 11）

// vector::crbegin/crend#include <iostream>#include <vector>using namespace std; int main (){  vector<int> myvector = {1,2,3,4,5};  cout << "myvector backwards:";  for (auto rit = myvector.crbegin(); rit != myvector.crend(); ++rit)    cout << ' ' << *rit;    cout << '\n';  return 0;}

Return Value

A const_reverse_iterator to the reverse beginning of the sequence.

Output:

myvector backwards: 5 4 3 2 1

vector::crend

同上。

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