class template with static member functions problem

[themadme]

Hi there,


I'm having a little bit of a problem and hopefully some one can help me.

I have not programmed in c++ for a while so excuse me for being silly

My problem involves with me creating a template class with static inlined member functions.

E.g.

LEX_INLINE is just a typedef for __forceinline
DllExport is a typedef for __declspec( dllexport )

template<class T>
class DllExport Helper
{
        public:
 
            LEX_INLINE static T max(T Value1, T Value2);
 
            LEX_INLINE static void setNaN(T &Value);
};
 
template<class T>
        LEX_INLINE T Helper<T>::max(T Value1, T Value2)
        {
            return (Value1 < Value2) ? Value2 : Value1;
        }
 
        template<class T>
        LEX_INLINE void Helper<T>::setNaN(T &Value)
        {
            Value = sqrt(-1.0f);
        }

now for example if i try this in a different file, for example -> Helper::max(1.0f, 2.0f)

i get compile error saying "Error 8 error C2955: 'Lex::Maths::Helper' : use of class template requires template argument list"

also i get errors for other functions saying this -> "Error 10 error C2670: 'Lex::Maths::Helper<T>::setNaN' : the function template cannot convert parameter 1 from type"


Any ideas for this rusty programmer?

[Banfa]

When you use a template class you have to provide the template parameters so Helper::max(1.0f, 2.0f) should be Helper<float>::max(1.0f, 2.0f)

[themadme]

thanks for the reply banfa but sadly to say, i have already done this and i still receive the "Error 8 error C2955: 'Lex::Maths::Helper' : use of class template requires template argument list"

but it did remove the "Error 10 error C2670: 'Lex::Maths::Helper<T>::setNaN' : the function template cannot convert parameter 1 from type" errors

[Banfa]

This (which is basically your code) compiles for me

#include <cmath>
using namespace std;
 
#define DllExport
#define LEX_INLINE inline
 
template<class T>
class DllExport Helper
{
    public:
 
        LEX_INLINE static T max(T Value1, T Value2);
 
        LEX_INLINE static void setNaN(T &Value);
};
 
template<class T>
LEX_INLINE T Helper<T>::max(T Value1, T Value2)
{
    return (Value1 < Value2) ? Value2 : Value1;
}
 
template<class T>
LEX_INLINE void Helper<T>::setNaN(T &Value)
{
    Value = sqrt(-1.0f);
}
 
int main()
{
    float t = Helper<float>::max(1.0f, 2.0f);
 
    return 0;
}
 

producing the single warning

bytes.cpp:31: warning: unused variable 't'

for obvious reasons.

[themadme]

hmmm interesting .. why am i still getting errors. Im going to do a few more tests tonight and find out why im getting errors. Thanks for the reply

[themadme]

Started a new clean slate of code and now it works ... i have no idea what sill mistake i did previously lol. Oh well thanks for your help Banfa :)