[转] 如何使用vector的reserve和resize方法

#[转] 如何使用vector的reserve和resize方法| 来源: 网络整理| 查看: 265

原帖地址：http://blog.csdn.net/linhao19841211_2/article/details/8154805

reserve和resize是vector里两个很重要的方法，有效地使用这两个方法可以减少reallocate memory的次数，提高程序的性能，所以还是有必要去研究一下的，先来看一段简单的代码吧。

stdafx.h

[html] view plain copy // stdafx.h : include file for standard system include files, // or project specific include files that are used frequently, but // are changed infrequently // #pragma once #include "targetver.h" #include #include // TODO: reference additional headers your program requires here #include #include #include using namespace std;

test.cpp

[cpp] view plain copy // test.cpp : Defines the entry point for the console application. // #include "stdafx.h" class A { public: A() : m_a(0) { } A(int a) : m_a(a) { } A(const A& a) : m_a(a.m_a) { } ~A() { } private: int m_a; }; int _tmain(int argc, _TCHAR* argv[]) { vector myVec; myVec.reserve(100); cout

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