#118Structs with defined representation

~clover commented · 2 years ago
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This is motivated by #61's requirement to have code that reads in JSON. Right now all structures do not have defined representation, making it impossible to use JSON.parse

I propose adding a representation mode:

struct S repr(.json) { field: int, other: float, } // alternate struct(.json) S { // struct S(.json) {

The repr clause takes a comptime enum (#117) value saying what representation shall be used.

enum Representation { auto, json, }

instead of following what zig has with extern struct, i think a better plan is to make this an enum, and let us explore more representation options. perhaps there can be one that represents it as a JS object with camel cased keys, since ix field names in my head are snake case.

Prior art on using a comptime enum like this can be seen in zig with callconv, align, and addrspace.

Milestone: 0.2.0.
~clover changed the status to Todo · 2 years ago

Rust-y syntax for this:

#[repr(json)]
struct S {
   field: int,
   other: float,
}

~clover commented · 1 year ago
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Owner
I want to see if i can avoid making # do anything for now. It might be useful for an operator later.

Maybe a better name for this is layout. While i think representation is more accurate to what it means, layout is shorter.