看如下报错的原因是什么？谢谢

[dragonsea]

代码如下：
头文件：vector.h

#ifndef VECTOR_H
#define VECTOR_H

template <typename object>
class vector
{
	public:
		explicit vector(int ini_size = 0);
		vector(const vector &rhs);
		~vector();
		const vector & operator= (const vector &rhs);
		void size() const;
		void resize(int new_size);
		void reserve(int new_capacity);
		object & operator[](int index);
		const object & operator[](int index) const;
		void push_back(const object & x);
		enum{SPARE_CACPCITY = 16};

	private:
		int the_size;
		int the_capacity;
		object *objects;
};

#endif

vector.cpp文件

#include "vector.h"
vector::vector(int init_size):the_size(init_size),the_capacity(init_size + SPARE_CAPACITY){
	the_size = init_size;
	objects = new object[the_capacity];
}

vector::vector(vector & rhs):objects(NULL){
	operator=(rhs);
}

~vector::vector(){
	delete [] objects;
}

const vector::vector & operator=(const vector & rhs){
	if(this != &rhs){
		delete [] objects;
		the_size = rhs.size();
		the_capactity = rhs.the_capacity;

		objects = object[the_capacity];
		for (int i = 0; i < the_size; i++){
			objects[i] = rhs[i];
		}
		return *this;
	}
}

void size() const{
	return the_size;
}

void resize(int new_size){
	if(new_size > the_capacity){
		the_size = new_size * 2 + 1;
		reserve(the_size);
	}
	the_size = new_size;
}

void reserve(int new_capacity){
	if(new_capacity < the_capacity){
		return;
	}
	object * old_objects = objects;
	objects = new object[new_capacity];
	for(int i=0; i < old_objects.size(); i++){
		objects[i] = old_objects[i];
	}
	the_capacity = new_capacity;
	delete [] old_objects;
}

object & operator[](int index){
	return objects[index];
}

void push_back(object & x){
	if(the_size == the_capacity){
		reserve(2 * the_capacity + 1);
	}
	objects[the_size++] = x;
}

main.cpp文件

#include "vector.h"
#include <iostream>
#include <string>

using namespace std;

int main(){
	string str("abc");
	vector<string> vc;
	vc.push_back(str);
	cout << vc[0] << endl;
	return 0;
}

三个文件在同一个目录
使用下面的命令编译 g++ main.cpp -o main

报错信息如下：
/tmp/cc93OlsO.o: In function `main':
main.cpp:(.text+0x66): undefined reference to `vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::vector(int)'
main.cpp:(.text+0x79): undefined reference to `vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::push_back(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
main.cpp:(.text+0x8a): undefined reference to `vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::operator[](int)'
main.cpp:(.text+0xb5): undefined reference to `vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::~vector()'
main.cpp:(.text+0xc8): undefined reference to `vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::~vector()'
collect2: ld returned 1 exit status

请问
1、报错是什么意思
2.代码那里有问题导致报错？

[www_adintr_com]

模版类需要把实现也放到头文件里面. 而且你的实现也不对, 写成内联函数的方式吧.

[kingxuke]

[Quote=引用 1 楼 的回复:]

模版类需要把实现也放到头文件里面. 而且你的实现也不对, 写成内联函数的方式吧.
[/Quote]

首先：模板不支持分离编译。你需要把 vector 的声明和定义放在一个文件里实现，详细原因看我之前回的一个帖子http://topic.csdn.net/u/20120801/12/ced57105-fd96-4038-a60d-f72222e97251.html?seed=1846712970&r=79290238
其次：你上面贴的代码的逻辑错误及书写错误太多了，下面给出修改后的可运行版本：
头文件：vector.h

#ifndef VECTOR_H
#define VECTOR_H

template <typename object>
class vector
{
public:
	explicit vector(int init_size = 0);
	vector(const vector &rhs);
	~vector();
	const vector & operator= (const vector &rhs);
	
	void size() const;
	void resize(int new_size);
	void reserve(int new_capacity);

	object & operator[](int index);
	const object & operator[](int index) const;
	void push_back(const object & x);
	
	enum {SPARE_CACPCITY = 16};

private:
	int the_size;
	int the_capacity;
	object *objects;
};

template <typename object>
vector<object>::vector(int init_size):the_size(init_size),
the_capacity(init_size + SPARE_CACPCITY){
	the_size = init_size;
	objects = new object[the_capacity];
}

template <typename object>
vector<object>::vector(const vector & rhs):objects(NULL){
	operator=(rhs);
}

template <typename object>
vector<object>::~vector(){
	delete [] objects;
}

template <typename object>
const vector<object> & vector<object>::operator=(const vector & rhs){
	if(this != &rhs){
		delete [] objects;
		the_size = rhs.size();
		the_capacity = rhs.the_capacity;

		objects = object[the_capacity];
		for (int i = 0; i < the_size; i++){
			objects[i] = rhs[i];
		}
		return *this;
	}
}

template <typename object>
void vector<object>::size() const{
	return the_size;
}

template <typename object>
void vector<object>::resize(int new_size){
	if(new_size > the_capacity){
		the_size = new_size * 2 + 1;
		reserve(the_size);
	}
	the_size = new_size;
}

template <typename object>
void vector<object>::reserve(int new_capacity){
	if(new_capacity < the_capacity){
		return;
	}
	object * old_objects = objects;
	objects = new object[new_capacity];
	for(int i=0; i < the_size; i++){
		objects[i] = old_objects[i];
	}
	the_capacity = new_capacity;
	delete [] old_objects;
}

template <typename object>
object & vector<object>::operator[](int index){
	return objects[index];
}

template <typename object>
void vector<object>::push_back(const object & x){
	if(the_size == the_capacity){
		reserve(2 * the_capacity + 1);
	}
	objects[the_size++] = x;
}

#endif

主文件：main.cpp

#include "vector.h"
#include <iostream>
#include <string>

using namespace std;

int main(){
	string str("abc");
	vector<string> vc;
	vc.push_back(str);
	cout << vc[0] << endl;
	return 0;
}
// 输出结果：abc

希望楼主好好对比更改前后的代码，原来的错误很容易得出。Good Luck！

[taodm]

另外，楼主，没事别搞些尽和标准库里东西重名的东西。

[dragonsea]

谢谢诸位。基本功还不扎实。经验一点点积累。