重新定义模板< T>类.在C ++中 [英] redefinition of template<class T> in C++

问题描述

我一直在寻找并解决我的问题的解决方案，但似乎找不到.我正在使用Code :: Blocks，并且收到模板类的重新定义错误.

I have searched and searched for a solution to my problem but I cannot seem to find one. I am using Code::Blocks and I am getting a redefinition error of a template class.

这是我的"vectorAux.h"文件:

Here is my "vectorAux.h" file:

#ifndef vectoraux_h
#define vectoraux_h

#include <vector>
#include <algorithm>
#include <iostream>

template <typename T>
void removeDup(std::vector<T> & v);

template <typename T>
unsigned seqVectSearch(const std::vector<T> & v, unsigned first,
               unsigned last, const T& target);

template <typename T>
void writeVector(const std::vector<T> & v);

#include "vectorAux.cpp"
#endif

这是我的"vectorAux.cpp"文件:

and here is my "vectorAux.cpp" file:

#include "vectorAux.h"

#include <vector>
#include <algorithm>
#include <iostream>

template <typename T>
void removeDup(std::vector<T> & v)
{
    std::vector<int> vector1;
    unsigned i, last = v.size();

    for(int j = 0; j <= v.size(); j++)
    {
        std::cout << seqVectSearch(v, j, last, j);
        if(seqVectSearch(v, j, last, j) != v[i])
            vector1.push_back(seqVectSearch(v, j, last, j));
    }
}

template <typename T>
unsigned seqVectSearch(const std::vector<T> & v, unsigned first,
                       unsigned last, const T& target)
{
    unsigned i = first;
    while((v[i] != target) && (v[i] <= last))
    {
        if(v[i] == target)
            return i;
        i++;
    }
    return last;
}

template <typename T>
void writeVector(const std::vector<T> & v)
{
    unsigned i;
    unsigned n = v.size();

    for (i = 0; i < n; i++)
        std::cout << v[i] << ' ';
    std::cout << std::endl;
}

该程序的最终文件是"vectorDriver.cpp"，但此文件没有错误.这只是通过调用函数来运行程序:

the final file for this program is "vectorDriver.cpp" but this one has no errors. This one just runs the program by calling the functions:

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

void fillVector(std::vector<int> & vect);

int main()
{
  using namespace std;

  vector<int> vect;

  fillVector(vect);
  cout << "Testing removeDup" << endl;
  cout << "Original vector is  ";
  writeVector(vect);

  removeDup(vect);
  cout << "Vector with duplicates removed is  ";
  writeVector(vect);
  cout << endl;
  writeVector(vect);

  return 0;
}

void fillVector(std::vector<int> & vect)
{
  int arr[] = {1,7,2,7,9,1,2,8,9};
  unsigned arrsize = sizeof(arr)/sizeof(int);

  vect = std::vector<int>(arr, arr+arrsize);
}

我将非常感谢您提供的所有帮助/建议！我已经浏览了一段时间，发现的每个来源都说要保护头文件，但是我已经做到了，但问题仍然存在.

I would really appreciate any and all help/advice that is given! I have looked around for a while and each source that I have found has said to guard the header file, but I have already done that and my problem still ensues.

推荐答案

您将vectorAux.cpp包含在vectorAux.h中.我猜想您也将单独编译vectorAux.cpp.因此，您最终在vectorAux.cpp中将代码编译了两次.

You include vectorAux.cpp in vectorAux.h. I would guess that you are also compiling vectorAux.cpp separately. So you end up compiling the code in vectorAux.cpp twice.

答案很简单，将代码从vectorAux.cpp移到vectorAux.h，删除vectorAux.cpp，您不需要它.

Answer is simple, move the code from vectorAux.cpp to vectorAux.h, delete vectorAux.cpp, you don't need it.

模板代码几乎总是放在头文件中.

Template code almost always goes in header files.

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