Re: map on fixed-size arrays

[Dmitry Olshansky]

On 21.08.2010 14:37, Eduardo Cavazos wrote:

Hello,

The 'map' from std.algorithm doesn't seem to work with fixed-size arrays:

----------------------------------------------------------------------
import std.stdio ;
import std.math ;
import std.algorithm ;

T sq ( T ) ( T x ) { return x*x ; }

void main ()
{
  double [2] a = [ 1.0 , 2.0 ] ;

  writeln ( map ! ( sq ) ( a ) ) ;
}
----------------------------------------------------------------------

$ rdmd test_map_sq_fixed_size_b.d

/usr/include/d/dmd/phobos/std/algorithm.d(108): Error: template instance Map!(sq,double[2u]) does not match template declaration Map(alias fun,Range) if (isInputRange!(Range))

Is this an intended limitation?

Ed

You always can workaround this by taking full slice:

import std.stdio ;
import std.math ;
import std.algorithm ;

T sq ( T ) ( T x ) { return x*x ; }

void main ()
{
  double [2] a = [ 1.0 , 2.0 ] ;

  writeln ( map ! ( sq ) ( a[] ) ) ;
}

I'm not sure if it's by design.

--
Dmitry Olshansky