• maarten van damme (10/10) Jul 03 2012 I have an array of structs and I've written a function that takes as
• bearophile (5/6) Jul 03 2012 Try with a lambda:
• maarten van damme (4/4) Jul 03 2012 Ok, that made sense :)
• bearophile (11/14) Jul 03 2012 Right, sorry. (If I don't run the code I show, then it's usually
• maarten van damme (3/3) Jul 03 2012 Ok, everything works great now.

maarten van damme <maartenvd1994 gmail.com> writes:

I  have an array of structs and I've written a function that takes as
argument a struct (and an array but this is besides the point) and
returns a unique string.

I wanted to use map to retrieve a string array of all unique strings
from that array. I've used it this way:
string [] added=map!("toName(a,parsedschema)")(mod.added);

But I get a compilation error:

bad unary function : toName(a,parsedschema) for type randomStruct.

Is my usage of map wrong?
what's the compiler trying to explain?

"bearophile" <bearophileHUGS lycos.com> writes:

maarten van damme:

 string [] added=map!("toName(a,parsedschema)")(mod.added);

Try with a lambda:

string[] added = mod.added.map!(x => toName(x, parsedschema))();

Bye,
bearophile

maarten van damme <maartenvd1994 gmail.com> writes:

Ok, that made sense :)

Now I get a variable with the Result type and this isn't castable or
convertable to an array of strings, how can I extract the actual
result now?

"bearophile" <bearophileHUGS lycos.com> writes:

maarten van damme:

 Now I get a variable with the Result type and this isn't 
 castable or convertable to an array of strings,

Right, sorry. (If I don't run the code I show, then it's usually 
broken in some way).


 how can I extract the actual result now?

Often you don't need an array, a lazy range is enough for many 
purposes. But if you really need an array of strings, then write 
something like:

const added = mod.added.map!(x => 
x.toName(parsedschema))().array();

array() is inside the module std.array.

Bye,
bearophile

maarten van damme <maartenvd1994 gmail.com> writes:

Ok, everything works great now.

thank you
maarten