Re: (Boost) Reflecto

On Mon, Apr 6, 2026 at 6:42 AM Andrey Semashev via Boost <
[email protected]> wrote:

> On 4 Apr 2026 21:47, Emil Dotchevski via Boost wrote:
> > I wrote a small constexpr type/enum reflection library which I think may
> be
> > a good addition to Boost. It needs C++17, although it relies on
> > implementation-specific support (works on gcc, clang and msvc).
> >
> > https://github.com/zajo/reflecto
>
> Why are the enum_lookup_range limits necessary? As far as I could tell
> from my brief glance at the code, you simply cut the enum value names
> from function signature strings, no actual lookup is involved, so why
> the limits?
>

- enum_value_name() can be invoked with a variable at run-time. This is
implemented in terms of indexing a constexpr array constructed over the
lookup range at compile time. If the value is out of the lookup range,
that's indicated in the state of the returned name object.

- enum_value_names<E> returns a constexpr array of name/value pairs (like
Describe does for described enums) that includes only the named values;
there is also named_enum_value_count and min_/max_named_enum_value.
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