C ++类模板未定义的引用功能 [英] C++ class template undefined reference to function

问题描述

我不断收到未定义的引用，当我从我的模板类调用这两个函数在我的主要功能的添加和大。

I keep getting undefined reference when i call the two functions from my template class "add" and "greater" in my main function.

所以，我有：
number.h

So, i have: number.h

#ifndef NUMBER_H
#define NUMBER_H

template <class T>
class number {
public:
    T x;
    T y;

    number (int a, int b){
        x=a; y=b;}
    int add (T&);
    T greater ();
};

#endif

number.cpp

number.cpp

#include "number.h"

template <class T>
int number<T>::add (T& rezAdd){
    rezAdd = x+y;
    return 1;
}

template <class T>
T number<T>::greater (){
        return x>y? x : y;
}

和我的主要文件是：resolver.cpp

And my main file is: resolver.cpp

#include <stdio.h>
#include <stdlib.h>
#include "number.h"

int main (int argc, char **argv) {
    int aux;
    number<int> c(3,5);

    c.add(aux);
    printf ("number added [%d]\n", c.add(aux));
    printf ("greater number: [%d]\n", c.greater());

    return 0;
}

这是我不断收到的错误是：

The errors that i keep getting are:

g++ -Wall -o tema1 resolver.cpp number.cpp
/tmp/ccX483J4.o: In function `main':
resolver.cpp:(.text+0x34): undefined reference to `number<int>::add(int&)'
resolver.cpp:(.text+0x47): undefined reference to `number<int>::add(int&)'
resolver.cpp:(.text+0x64): undefined reference to `number<int>::greater()'
collect2: ld returned 1 exit status
make: *** [all] Error 1

感谢您提前帮助！

推荐答案

您的类被命​​名为错误的。您的类被命​​名为才，其中所有的功能都属于一个名为类数量： http://ideone.com/ZayX0c

Your class is named wrong. Your class is named cai where all your functions belong to a class named number: http://ideone.com/ZayX0c

还有一件事..你不能在.cpp文件模板。模板函数/ defintions在头去与类声明一起。这是您的未定义的函数错误的原因。非模板函数去在.cpp。

One more thing.. you cannot have templates in the .cpp file. Template functions/defintions go in the header along with the class declaration. This is the reason for your undefined function error. Non-template functions go in the .cpp.

#include <cstdio>
#include <cstdlib>

template <class T>
class number {
public:
    T x;
    T y;

    number (int a, int b){
        x=a; y=b;}
    int add (T&);
    T greater ();
};

template <class T>
int number<T>::add (T& rezAdd){
    rezAdd = x+y;
    return 1;
}

template <class T>
T number<T>::greater (){
        return x>y? x : y;
}


int main (int argc, char **argv) {
    int aux;
    number<int> c(3,5);

    c.add(aux);
    printf ("number added [%d]\n", c.add(aux));
    printf ("greater number: [%d]\n", c.greater());

    return 0;
}

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