如何处理C ++链接错误 [英] How to deal with C++ linkage error
问题描述
你好以下的人是我的代码..编译好但是当它到达链接代码时这个错误虹膜;
hapter9exe42.o
chapter9exe42.o：在函数`main'中：
chapter9exe42.cpp :(。text + 0x4d）：未定义引用`int SALES :: setarr< double>（double *）'
chapter9exe42.cpp :(。text + 0x6a）：未定义引用`void SALES :: displayer< double>（double *，int）'
collect2：错误：ld返回1退出状态
请注意我的问题是链接终端上的代码
这里是头文件
＃ ifndef SANS2_H_INCLUDED
#define SANS2_H_INCLUDED
namespace SALES
{
const int quater = 4;
struct sale
{
双倍销售[quater];
双倍平均值;
最大倍数;
双分;
};
void setsale（sale&，const double []，int n）;
模板< class T>
int setarr（T *）;
无效展示（const sale& s）;
模板< class T>
void displayer（T *，int）;
}
双倍平均值（double *，int）;
double max（double *，int）;
double min（double *，int）;
#endif // SANS2_H_INCLUDED
这里是包含函数定义的文件
#include< iostream>
#includeSANS2.h
双倍平均值（double * arr，int n）
{
double * sum = new double;
for（int i = 0; i< n; i ++）
* sum + = arr [i];
return（* sum）/ n;
}
double max（double * arr，int n）
{
double c;
c = arr [0];
for（int i = 1; i< n; i ++）
{
（arr [i]> = c）？c = arr [i]：c = C;
}
返回c;
}
double min（double * arr，int n）
{
double c;
c = arr [0];
for（int i = 1; i< n; i ++）
{
（arr [i]< = c）？c = arr [i]：c = C;
}
返回c;
}
无SALES :: setsale（SALES :: sale& s，const double arr []，int n）
{
for （int i = 0; i< n; i ++）
{
s.sales [i] = arr [i];
}
for（int i = n; i< SALES :: quater; i ++）
{
s.sales [i] = 0;
}
s.average = average（s.sales，n）;
s.max = max（s.sales，n）;
s.min = min（s.sales，n）;
}
模板< class T>
int SALES :: setarr（T * s）
{
int i = 0;
while（std :: cin>> s [i]）
i ++;
}
void SALES :: displaysale（const SALES :: sale& s）
{
std :: cout<<sales ：<< s.sales<<的std :: ENDL;
std :: cout<<平均销售额：<<< s.average<< std :: endl;
std :: cout<<mininal sale：<< s.min<< std :: endl;
std :: cout<<maximal sale：<< s.max<< std :: endl;
}
模板< class T>
void SALES :: displayer（T * p，int n）
{
int i;
for（i = 0; i< n; i ++）
{
std :: cout<<element<< i + 1<< p [1] - ;<的std :: ENDL;
}
}
和这是主文件
#include< iostream>
#includeSANS2.h
static const int LEN = 100;
int main（）
{
SALES :: sale po;
double arr [LEN];
int number_of_elements;
std :: cout<<嘿，你好男人：<< std :: endl;
number_of_elements = SALES :: setarr（arr）;
SALES :: displayer（arr，number_of_elements）;
返回0;
}
我的尝试：
我通过互联网搜索了类似问题的解决方案，我发现我将其应用到我的代码但没有改变。所以我决定把它带到这里。
感谢您的帮助..
模板需要编译成一个文件，其中的类型可以由编译器正确推导出来。上面带有函数定义的文件没有说明模板类型应该是什么。我怀疑它将默认为 int ，如模板中所建议的那样（C ++） [ ^ ] hello guys below is my piece of code ..it compiles well but when it reaches linking the code this error irises ;
hapter9exe42.o
chapter9exe42.o: In function `main':
chapter9exe42.cpp:(.text+0x4d): undefined reference to `int SALES::setarr<double>(double*)'
chapter9exe42.cpp:(.text+0x6a): undefined reference to `void SALES::displayer<double>(double*, int)'
collect2: error: ld returned 1 exit status
please note that my problem is linking the code on the terminal
here is the header file
#ifndef SANS2_H_INCLUDED
#define SANS2_H_INCLUDED
namespace SALES
{
const int quater = 4;
struct sale
{
double sales[quater];
double average;
double max;
double min;
};
void setsale(sale &,const double [],int n);
template<class T>
int setarr(T *);
void displaysale(const sale & s);
template<class T>
void displayer(T *,int );
}
double average(double*,int );
double max(double *,int );
double min(double *,int );
#endif // SANS2_H_INCLUDED
here is the file containing the functions definitions
#include <iostream>
#include "SANS2.h"
double average(double * arr,int n)
{
double * sum= new double;
for(int i=0;i<n;i++)
*sum+=arr[i];
return (*sum)/n;
}
double max(double * arr,int n )
{
double c;
c = arr[0];
for(int i=1;i<n;i++)
{
(arr[i]>=c)?c=arr[i]:c=c;
}
return c;
}
double min(double *arr,int n )
{
double c;
c = arr[0];
for(int i=1;i<n;i++)
{
(arr[i]<=c)?c=arr[i]:c=c;
}
return c;
}
void SALES::setsale(SALES::sale & s,const double arr[],int n)
{
for(int i=0;i<n;i++)
{
s.sales[i]=arr[i];
}
for(int i =n;i<SALES::quater;i++)
{
s.sales[i]=0;
}
s.average = average(s.sales,n);
s.max = max(s.sales,n);
s.min= min(s.sales,n);
}
template<class T>
int SALES::setarr(T* s)
{
int i = 0;
while(std::cin>>s[i])
i++;
}
void SALES:: displaysale(const SALES::sale & s)
{
std::cout<<"sales :"<<s.sales<<std::endl;
std::cout<<"average sales :"<<s.average<<std::endl;
std::cout<<"mininal sale :"<<s.min<<std::endl;
std::cout<<"maximal sale :"<<s.max<<std::endl;
}
template<class T>
void SALES::displayer(T *p,int n)
{
int i;
for(i=0;i<n;i++)
{
std::cout<<"element "<<i+1<<p[i]<<std::endl;
}
}
and here is the main file
#include <iostream>
#include "SANS2.h"
static const int LEN = 100;
int main()
{
SALES::sale po;
double arr[LEN];
int number_of_elements;
std::cout<<"hey man how are you man :"<<std::endl;
number_of_elements = SALES::setarr(arr);
SALES::displayer(arr,number_of_elements);
return 0;
}
What I have tried:
i've searched over the internet for solution to similar problems and the ones i found i applied it to my code but nothing changed..so i decide to take it here.
thanks for help..
The templates need to be compiled into a file where their types can be properly deduced by the compiler. The file above with the function definitions gives no indication of what the template types should be. I suspect it will default to int as suggested in Templates (C++)[^].这篇关于如何处理C ++链接错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
