Re: [boost] [review] [json] My JSON review

On Mon, 21 Sep 2020 at 19:30, Mathias Gaunard via Boost < boost@lists.boost.org> wrote:

On Mon, 21 Sep 2020 at 17:49, Vinnie Falco wrote:

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This looks very much like it depends on the order of appearance of

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keys in the JSON, which is non-standard.

You'd parse the object until you reach the desired key, building an

index of where the various keys you meet on the way are (with possibly

extra information of where the associated value starts/end etc.), then

for the next one either it's in the index so you can use it then

discard it, or it's ahead, so you can continue with the same

algorithm.

That would be optimized for keys being ordered as expected, ignoring

extra keys, while still supporting out-of-order keys (albeit with some

extra storage requirements that grows with your nesting level).

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In both cases, I'd like to read/write my data from/to JSON with the

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same framework.

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Why? What specifically, is the requirement here?

What I'd like is a way to describe how my C++ types map to a key-value

structure with normalized types so that I can easily convert my

objects back and forth through a structured self-describing and

human-readable interchange format.

Ideally I'd like to do so without repeating myself with all kinds of

converters, serializers, etc. and reasonably efficiently, which is why

I'd like these things to be reasonably unified.

A custom handler for basic_parser ought to be able to do this, coupled with a simple way of describing reflection in terms of element name and reference to value (or get/set functions).

Boost.Serialization doesn't do this, since it takes the approach of

designing a data format to serialize any C++ structure, rather than

mapping a C++ structure to a simpler text-based structure.

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