Using numeric_limits::max() in constant expressions

Question

I would like to define inside a class a constant which value is the maximum possible int. Something like this:

class A
{
    ...
    static const int ERROR_V         


        

Answer 1

• I will try to answer you as much as I understood from your question:

1- If you want a static const int in your program to be initialized with a function:

int Data()
{
 return rand();
}

class A
{
public :
    static const int ee;
};
const int A::ee=Data();

This works on VS 2008

2- If you want to get max and min number for a given data type, then use these definitions INT_MAX, INT_MIN, LONG_MAX and so on..

3- If however you need to use these wrt template type, then hard code the templates yourself

template<>
int MaxData()
{
 return INT_MAX;
}

and

template<>
long MaxData()
{
 return LONG_MAX ;
}

and call them like this

int y=MaxData();

4- and if you are only dealing with binary represented types only, then use this:

template 
T MaxData(){
    return ~(1<<((sizeof(T)*8)-1));
}

and this

template 
T MinData(){
    return (1<<((sizeof(T)*8)-1));
}

Hope this can help you..