On Sunday, 20 February 2022 at 11:08:55 UTC, partypooper wrote:
Hello, I'm new to D.
Title is self described, is it possible to use keyword as
struct field?
Maybe it is XYproblem, so here I will describe a little what I
need.
I'm parsing some json currently with
[mir-ion](https://code.dlang.org/packages/mir-ion)
(better/simpler suggestions for only json de/serialization?),
that has "version" as one of it's keys, so I can't use that as
field in my struct. Maybe some annotation in mir library to
parse "version" into other struct field name, can't find though
(its docs pretty concise).
I have a library solution based on opDispatch +
__traits(getMember):
```d
/**
* Mixin template allowing to use a field as if its identifier is
a D keyword.
* Note that this only works with `__traits(getMember)`.
* Params:
* keywordFieldPairs = An array of keyword and field pairs.
*/
template FieldOfKeyword(string[2][] keywordFieldPairs)
{
template opDispatch(string member)
{
static foreach (pair; keywordFieldPairs)
static if (member == pair[0])
mixin("alias opDispatch = ", pair[1], ";" );
}
}
///
unittest
{
struct Foo
{
mixin FieldOfKeyword!([["scope", "scope_"],["class",
"class_"]]);
string scope_;
string class_;
}
Foo foo;
__traits(getMember, foo, "scope") = "The Universe";
assert(__traits(getMember, foo, "scope") == "The Universe");
__traits(getMember, foo, "class") = "Atom";
assert(__traits(getMember, foo, "class") == "Atom");
}
```
never used it TBH.
