“undefined reference to”c++ template

最新推荐文章于 2025-06-03 09:11:29 发布

原创最新推荐文章于 2025-06-03 09:11:29 发布 · 1.7k 阅读

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#reference #c++ #include #translation #header #function

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本文探讨了C++中模板函数的实现问题，特别是在不同文件中声明与定义时遇到的挑战。介绍了如何通过将模板定义包含在头文件中或使用export关键字来解决这一问题，并讨论了这些方法可能带来的编译时间和代码组织上的影响。

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You need to use the export keyword. However, I don't think G++ has proper support, so you need to include the template function's definition in the header so the translation unit can use it. This is because the <int> 'version' of the template hasn't been created, only the <typename T> 'version.'

An easy way is to #include the .cpp file. However, this can cause problems, e.g. when other functions are in the .cpp file. It will also likely increase the compile time.

A clean way is to move your template functions into its own .cpp file, and include that in the header or use the export keyword and compile it separately.

c++中template不支持声明和实现分别放在不同的文件中。可以通过include cpp文件解决这个问题。