容器vector<bool>是vector模板的一个特化
一个标准的bool变量至少需要一个字节
但是因为一个bool型只有两个状态
//: C07:VectorOfBool.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Demonstrate the vector<bool> specialization.
#include <bitset>
#include <cstddef>
#include <iostream>
#include <iterator>
#include <sstream>
#include <vector>
using namespace std;
int main() {
vector<bool> vb(10, true);
vector<bool>::iterator it;
for(it = vb.begin(); it != vb.end(); it++)
cout << *it;
cout << endl;
vb.push_back(false);
ostream_iterator<bool> out(cout, "");
copy(vb.begin(), vb.end(), out);
cout << endl;
bool ab[] = { true, false, false, true, true,
true, true, false, false, true };
// There's a similar constructor:
vb.assign(ab, ab + sizeof(ab)/sizeof(bool));
copy(vb.begin(), vb.end(), out);
cout << endl;
vb.flip(); // Flip all bits
copy(vb.begin(), vb.end(), out);
cout << endl;
for(size_t i = 0; i < vb.size(); i++)
vb[i] = 0; // (Equivalent to "false")
vb[4] = true;
vb[5] = 1;
vb[7].flip(); // Invert one bit
copy(vb.begin(), vb.end(), out);
cout << endl;
// Convert to a bitset:
ostringstream os;
copy(vb.begin(), vb.end(),
ostream_iterator<bool>(os, ""));
bitset<10> bs(os.str());
cout << "Bitset:" << endl << bs << endl;
getchar();
} ///:~
输出
1111111111
11111111110
1001111001
0110000110
0000110100
Bitset:
0000110100
最后一部分创建了一个vector<bool>
通过先将它转换成一个仅包含0和1的string
再转换成为一个bitset