Re: binary format of the number.

Michael DOUBEZ <>
Mon, 01 Dec 2008 13:30:11 +0100
Tarmo Kuuse a ?crit :

blargg wrote:

If you really want binary, you can write a macro (or template) that
accepts four 8-bit chunks, something like

Can you point to a sound compile time implementation of such
macro/template? I'd be interested.

Sorry, ignore my previous post. I thought you wanted to output it in a
stream in bin format.

With binary defined as follow:

template<typename T=unsigned,int nbbit=8>
struct binary
     //initialize octet with binary form long
     binary(long v)
         T exp=1;
         //ensure v in range 0 11111111
         //build value
             ldiv_t d=ldiv(v,10); //ldiv from stdlib.h C99

     //initialize octet with pre-computed value
     struct value
         T val;
         value(T v):val(v){}
     explicit binary(const value& v):val(v.val){}

     operator T()const{return val;}

     T val;

//concatenate binaries
template<typename T,int nbbit_lhs,int nbbit_rhs>
binary<T,nbbit_lhs+nbbit_rhs> operator<<(
         const binary<T,nbbit_lhs>& lhs,
         const binary<T,nbbit_rhs>& rhs)
     typedef binary<T,nbbit_lhs+nbbit_rhs> binary_type;
     return binary_type(
             typename binary_type::value(

int cons=binary<int>(10000000)binary<int>(0);

You can improve of the template expression such as:
  * binary(int val,int number) to build representation of number with
only 0s or 1s in a given number at given position.
  * using fills fill<int,24>(1) -> 111...11 24 bits

And so on.


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