C ++模板,链接错误 [英] C++ template, linking error
问题描述
我在调用我有一个模板类有一个问题。
我声明了一个新的类型名称数组,它是一个模板;
I have a problem in calling a template class I have. I declared a new type name Array, which is a template;
在.hpp文件中:
template <typename T>
class Array
{
public:
Array();
};
在.cpp文件中:
template <typename T>
Array<T>::Array()
{
//Do something
}
在主体中:
Array<int> arr;
我收到链接错误:未解决的外部符号到ctor。
I get Linkage error: unresolved external symbol to the ctor.
任何想法?
推荐答案
模板功能(包括成员函数)这意味着如果你有一个模板类,它的实现必须完全在一个头。这是因为编译器需要访问整个模板定义(而不仅仅是签名),以便为模板的每个实例化生成代码。
Templates functions, including member functions, must be written entirely in headers. This means that if you have a template class, its implementation must be entirely in a header. This is because the compiler needs to have access to the entire template definition (not just the signature) in order to generate code for each instantiation of the template.
这篇关于C ++模板,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!