Often in C I want the compiler to generate a simple hash of a string or something at compile time... this is very troublesome as the compiler hardly ever does it all at compile time.  For instance:

Will the D compiler (with optimizations enabled) generate the same code for
this snippet:

{
  static const char[] str = "123";
  int checksum = 0;
  for (int i = 0; i < str.length; ++i)
    checksum += str[i];
}

as it would make for this snippet? :

{
  int checksum = '1' + '2' + '3';
}

It should, since everything involved in the first snippet is compile-time constants.

Sean

While the compiler could do such, it does not fold constants computed by loops. If you need them computed at compile time, what I'd do is write a program that generated the strings and their hashes, wrote out a module, and then compile that module.

"Sean L. Palmer" <spalmer@iname.com> wrote in message news:9tainn$1gb7$1@digitaldaemon.com...
> Often in C I want the compiler to generate a simple hash of a string or something at compile time... this is very troublesome as the compiler
hardly
> ever does it all at compile time.  For instance:
>
> Will the D compiler (with optimizations enabled) generate the same code
for
> this snippet:
>
> {
>   static const char[] str = "123";
>   int checksum = 0;
>   for (int i = 0; i < str.length; ++i)
>     checksum += str[i];
> }
>
> as it would make for this snippet? :
>
> {
>   int checksum = '1' + '2' + '3';
> }
>
> It should, since everything involved in the first snippet is compile-time constants.
>
> Sean
>
>