定长容器

#include<iostream>
#include<vector>
#include <string>
#include <list>
using namespace std;

int main()
{
	list<string> v;
	v.assign(10,"tt");
	cout << v.size() << endl;
	v.push_back("a");
	cout << v.size() << endl;
}

10
11
分配了10个空间，但还是可以动态增加的，无论是list还是vector

#include<iostream>
#include<vector>
#include <string>
#include <list>
using namespace std;

int main()
{
	vector<string> v;
	v.assign(10,"tt");
	cout << v.size() << "," << v.capacity() << endl;
	v.push_back("11");//再增加一个后，capacity的值会根据编译器的实现而不同，书上是double(20)但vs2012则是15
	cout << v.size() << "," << v.capacity() << endl;
	v.shrink_to_fit();//去除多余的空间
	cout << v.size() << "," << v.capacity() << endl;
}

10,10
11,15
11,11