Eduardo Cavazos <wayo.cava...@gmail.com> wrote:
Pt opBinary( string op : "+", T : Pt )( T a ) {...} Pt opBinary( string op : "+", T : float )( T a ) {...}
Pt opBinary( string op, T )( T a ) if ( ( op == "+" ) && is( T == Pt ) ) {...}Pt opBinary( string op, T )( T a ) if ( ( op == "+" ) && is( T == float )) {...}Is either one of those solutions preferrable? Or are they equivalent? I'd like to get these right now since there are a bunch more like this (for all the various operators and combinations).
They are not entirely equivalent. The first two use T : float, which is a test of implicit castability, while is( T == float ) is a test for equality. IOW, the second set would barf on receiving a non-float parameter, like double or int. For some reason I messed that up. If instead I had written the tests as is( T : Pt ) and is( T : float ), they would be equivalent. string op : "+" basically means the same as the template constraint if ( op == "+" ). The latter is more flexible, as you can compare to more values than the singular value in the op : "+". -- Simen
