error C2057: expected constant expression

[manuanchani]

struct x : public y
{
const static int iword_index = std::ios_base:: xalloc();
}

i'm getting the error C2057: expected constant expression,whil e compiling.
please help me in solving this problem.

[weaknessforcats]

A static variable is not a member of a struct. It has the scope of the struct but declaring it inside the struct does not create the variable.

You have to create ansd initialize the variable outside the struct and then you can refer to it from inside the struct:

 const static int iword_index = std::ios_base::xalloc();
struct y
{

};
struct x : public y
 {
 //const static int iword_index = std::ios_base::xalloc();
 const static int iword_index;
 };