On 2017-02-20 17:04, Martin Tschierschke wrote:
Hello,
I have a little program where I am filling a struct with values from an
regex match.
Now I want to display the content of the struct for debugging purpose.
If struct is named MyStruct
I can print a list of the field names with:
foreach(fieldname;FieldNameTuple!MyStruct){writef("%s ",fieldname);}
If myvar is of type MyStruct how can I make a table like:
fieldname_1: value_1
fieldname_2: value_2
.
.
fieldname_n: value_n
Is there a way to do this with a single expression in D.
Similar to a ruby call myvar.send(fieldname) to get the value from
fieldname inside a loop?
write(myvar); sure is working directly but I want to get the field names
displayed, too.
(A work around might be work with the format("%s",myvar) string and
extract the values with an index?)
Yes, this works, I would say this is the simplest:
MyStruct s;
foreach (index, name ; FieldNameTuple!MyStruct)
writefln("%s: %s", name, s.tupleof[index]);
If you want something more close to "send" in Ruby, you need to use a
string mixin, like this:
foreach (name ; FieldNameTuple!MyStruct)
writefln("%s: %s", name, mixin("s." ~ name));
The string mixin example works for methods, opDispatch and similar as
well. The tupleof example, the first one, works only for fields.
--
/Jacob Carlborg
