Representations for values

[Nostracodus]

IPR needs a representation for values. By values, I mean the objects that result from evaluation of prvalues.

IPR currently has representations for:

• booleans
• strings
• nullptr
• pointers-to-member

IPR does not currently represent:

• integers
• floats
• records
• unions
• arrays

[GabrielDosReis]

IPR expected clients to use string representation for literals ("universal representation"), but of course that works only in pre-C++03 era, not with compile-time evaluation. Options here range from taking dependencies on external libraries (such as GMP, but with more permissive license) to developing homebrew, purposely-tailored libraries.

aggregate values missing is an oversight. What is needed is not so much the notion of value than that of an "irreducible expression" (which includes values)