错误:类模板已经定义
我有这个小模板类:
namespace emple {
template <class LinkedClass>
class LinkedInList
{
public:
LinkedInList()
{
active = false;
}
~LinkedInList(){}
LinkedClass* getNext() const
{
return next;
}
void setNext(LinkedClass* const next_)
{
next = next_;
}
void setActive(bool state)
{
active = state;
}
bool isActive()
{
return active;
}
private:
LinkedClass* next;
bool active;
};
};
编译时出现这个错误:
类模板已经定义.
我做错了什么?
推荐答案
这是由于多次包含相同的头文件(其中包含此模板类)造成的.这通常在 C++ 中通过使用守卫来解决:
This is caused by multiply including the same header file (which contains this template class). This is typically solved in C++ by either using guards:
#ifndef EMPLE_H
#define EMPLE_H
// your template class
#endif
或 #pragma once
s(我知道的每个编译器都支持)并且不那么混乱:
or #pragma once
s (which are supported by every compiler I know) and are less cluttering:
#pragma once
// your template class
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