[英]Question regarding C++ Templates
I used a simple class for a test program about templates, this is what I did: 我为有关模板的测试程序使用了一个简单的类,这就是我所做的:
template <typename T>
class test
{
public:
test<T>::test();
T out();
};
template <typename T>
test<T>::test()
{
}
T test<T>::out()
{
}
int main()
{
//test<int> t;
}
But when I try to compile it says 'T' : undeclared identifier and use of class template requires template argument list , pointing to the same line, where I have implemented the method out() . 但是,当我尝试编译时,它说“ T”:未声明的标识符和类模板的使用需要模板参数列表 ,指向同一行,在该行中我实现了方法out() 。 Can anyone please explain what the problem is??
谁能解释这个问题是什么? I'm using visual studio 2008.
我正在使用Visual Studio 2008。
Following is more accurate: 以下更准确:
template <typename T>
class test
{
public:
test();
T out();
};
template <typename T>
test<T>::test()
{
}
template <typename T>
T test<T>::out()
{
}
1) Don't use <T>
inside class 2) Don't forget to declare template <T>
before each method declaration out of class body 1)不要在类内部使用
<T>
2)不要忘记在类主体之外的每个方法声明之前声明模板<T>
Your definition of the out member is missing the template argument list. 您对out成员的定义缺少模板参数列表。 out should read:-
出来应该是:
template <typename T>
T test<T>::out()
{
}
This line is wrong: 这行是错误的:
test<T>::test();
Just write this: 只需写下:
test();
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