未定义对void“函数”的引用。 C ++ [英] undefined reference to void "function" C++

问题描述

我收到以下错误：

features.cpp:(.text+0x4f6): undefined reference to `void Convolve<float>(CImageOf<float>, CImageOf<float>&, CImageOf<float>)'

所以，在我的features.cpp文件中，我添加了以下头文件，内容：

So, in my features.cpp file, I added the following header file, with the content:

template <class T>
void Convolve(CImageOf<T> src, CImageOf<T>& dst,
              CFloatImage kernel);

我在ubuntu 64位上用GCC编译。我意识到，上面的错误是因为我的标题不匹配的引用，但这是因为模板，所以我不应该有这个问题吗？还有什么事吗？

I'm compiling this with GCC on ubuntu 64bit. I realize that the error above is because what is in my header does not match the reference, but that's because of the template, and so I shouldnt be having this problem right? What else is going on?

我双重检查了我对convolve的调用，实际上是我使用的类型：

I double checked my calls to convolve, and actually this is the types I'm using :

Convolve(CFloatImage, CFloatImage, CFloatImage); 

我实际上找不到上述错误的任何参考

I can't actually find any reference to the error above

推荐答案

在聊天与OP问题可能在一个Makefile没有正确链接。

As turned out in a chat with the OP the problem was probably in a Makefile that did not link correctly.

没有定义，但模板的声明。 h文件（因为你建议的一些）。我认为OP混淆了这些术语。

There was no definition but a declaration of the template in the .h file (as some of you suggested). I think the OP confused the terms.

然而，.cpp文件中有一个模板定义以及一个（非模板）函数定义实例化 Convolve< float> （和其他人）。

However there was a definition of the template in the .cpp file along with a (non template) function definition that instantiated Convolve<float> (and others).

所以重复一遍：代码是正确的，但是构建例程不是。

So to repeat it: The code was correct but the build routine was not.

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