Question

I have a header file in where I store various typedefs. The problem is that I need to pass a variable from a source file to one of those typedefs.

I have tried this:

extern const unsigned int number;
typedef Storage<double,number> store;

in the header file.

Then in the source file, the number variable is instantiated at execution time:

const unsigned int number( conf->ReadNumber() );

However, it does not work.

Is this thing possible? Any idea?

Answer 1

Storage<double,number> wait for number to be a constant expression : It’s value must be computable at compile time.