[super! 1/6] Introduce the *ProBasicMeta* and *ProMeta* named requirements - #66
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[super! 1/6] Introduce the *ProBasicMeta* and *ProMeta* named requirements#66mingxwa wants to merge 1 commit into
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A "meta" is an object holding metadata deduced from a type at compile time, stored in or referenced by a proxy. proxy creates, copies, assigns, and destroys metadata in contexts specified not to throw, but nothing required a reflector to actually support those operations without throwing, or to be default-constructible at all. Define the ProBasicMeta and ProMeta named requirements, and enforce them via the new basic_meta, meta, and basic_reflection concepts. is_reflector_well_formed() now checks meta<R, T> rather than plain constructibility, so a reflector that can throw, or that cannot be default-constructed, copied, or assigned, is no longer proxiable and is diagnosed as a reflection that is not implemented. This tightens proxiable: a reflector whose constructor may throw was previously accepted.
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A "meta" is an object holding metadata deduced from a type at compile time, stored in or referenced by a proxy. proxy creates, copies, assigns, and destroys metadata in contexts specified not to throw, but nothing required a reflector to actually support those operations without throwing, or to be default-constructible at all.
This PR writes those obligations down and enforces them.
Breaking change. A reflector whose constructor may throw, or that cannot be default-constructed, copied, or assigned, is no longer proxiable and is diagnosed as a reflection that is not implemented. Reflectors in the tests and in the documented examples are updated accordingly.