c++: Passing const int to template function

I am using the rapidxml lib. It defines a function to parse files in this way:

template<int Flags>
void parse(Ch *text)

The lib provides const int flags for example:

const int parse_declaration_node = 0x20;

So I created a pointer to a static int in my class:

const int * parser_mode;

And in the class constructor I assigned it its value:

parser_mode = &rapidxml::parse_declaration_node;

Then when I try to use this const int * as template argument to the parse function:

tree->parse<parser_mode>(file->data());

I get this error message:

error: ‘GpxSectionData::parser_mo开发者_Go百科de’ cannot appear in a constant-expression

This rest of the statement seems correct since:

tree->parse<0>(file->data());

doesn't produce compilation error...

Could you please tell me what I am missing here? Thank you!

Thanks to the explanations below I will probably define it out of the class: So I think this is:

class Myclass {
static const int parser_mode;
[...]
}
static const int Myclass::parser_mode = rapidxml::parse_declaration_node;

template<int Flags> void parse(Ch *text) ... const int * parser_mode;

Your template takes an int as a template parameter, but you are passing it an int*. The types int and int* are not the same.

Try tree->parse<rapidxml::parse_declaration_node>(file->data());

You cannot use variable for value of template parameter.

Instead you can add Flags template parameter to your class

template<int Flags>
class CClass {
    //...
};

And set Flags parameter for class instance

CClass<rapidxml::parse_declaration_node> obj;