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Lua 5.3 bitwise operator support.#45

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dan-masek wants to merge 2 commits into
Oberon00:masterfrom
dan-masek:add_lua53_bitwise_operators
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Lua 5.3 bitwise operator support.#45
dan-masek wants to merge 2 commits into
Oberon00:masterfrom
dan-masek:add_lua53_bitwise_operators

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@dan-masek

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Add support for Lua 5.3's bitwise operators (and, or, xor, not, shl, shr).

XOR is a bit awkward to use, since its operator is already abused for pow.
For example:
.def("__bxor", static_cast<std::string(*)(operator_tester const&, operator_tester const&)>(&operator^))

…shr). XOR is a bit awkward to use, since its operator is already abused for pow.
@dan-masek

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OK, compatibility with 5.2 and 5.1....

I suppose it's enough to make the tests conditional based on the lua version used, since having extra metatable entries shouldn't be an issue.

Do you think there's a point in making the support conditional as well?

@Oberon00 Oberon00 left a comment

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Thank you very much for the contribution! I'm not really maintaining this repository anymore, but your change looks useful and low-risk enough that I think I'm going to merge it without testing it myself 😃 If you have time to add the additional test assertions (see comment), that would be even better, otherwise tell me if you prefer to merge it as-is.

Comment thread test/test_operators.cpp
DOSTRING(L, "assert(~test == 'bitwise not operator')")
DOSTRING(L, "assert(test << test == 'left shift operator')")
DOSTRING(L, "assert(test >> test == 'right shift operator')")
#endif

@Oberon00 Oberon00 May 15, 2021

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Can you add a #else (or always-on) test that the metamethods with expected names are defined even if Lua does not interpret the names specifically?

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OK, I'll have a look at it.

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