Problem on template specialization

[shuisheng]

Dear All,

I have a simple code, but it has some problem in cimpiling. Would you
please help me to look at it?

template<class Type, size_t N>
class Vector
{
private:
Type data[N];

public:

template<size_t i>
Type Product() const
{
return data * Product(i+1);
}

template<>
Type Product<N>() const
{
return 1;
}
}

The compilor error is that:

Error 1 error C2975: 'i' : invalid template argument for
'Vector<Type,N>:roduct', expected compile-time constant expression

What I assume is that N is a compile-time constant expression. I
appreciate your help.

Bests,

Shuisheng

 

[Rolf Magnus]

Dear All,

I have a simple code, but it has some problem in cimpiling. Would you
please help me to look at it?

template<class Type, size_t N>
class Vector
{
private:
Type data[N];

public:

template<size_t i>
Type Product() const
{
return data * Product(i+1);

There is no Product() function that takes an integer as argument in your
code.

}

template<>
Type Product<N>() const
{
return 1;
}
}

The compilor error is that:

Error 1 error C2975: 'i' : invalid template argument for
'Vector<Type,N>:roduct', expected compile-time constant expression

Which line does that error refer to?

What I assume is that N is a compile-time constant expression.

Well, you haven't showed how you are instantiating your template.

 

[shuisheng]

Rolf Magnus 写é“：

template<class Type, size_t N>
class Vector
{
private:
Type data[N];

public:

template<size_t i>
Type Product() const
{
return data * Product(i+1);

There is no Product() function that takes an integer as argument in your
code.

}

template<>
Type Product<N>() const <<<<<<<<<<< ERROR LINE

{
return 1;
}
}

The compilor error is that:

Error 1 error C2975: 'i' : invalid template argument for
'Vector<Type,N>:roduct', expected compile-time constant expression

Which line does that error refer to?

What I assume is that N is a compile-time constant expression.

Well, you haven't showed how you are instantiating your template.

Vector<int, 4> v(1);
int prod = v.Product<0>();

Thanks.

 

[Jeff Faust]

You can't specialize a class function on the class template parameter.
You can't use 'N' as the specialization. I can dig up the standard-eze
if you'd like.

Jeff