[parallel.simd.reference] Fix swap value_type params to be lvalues #84
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In the class definition of `simd::reference` the `value_type` parameters for `swap()` are rvalue references. This does not make sense; `swap()` must accept lvalue-references to `value_type` to be able to exchange the referred values. The detailed description of `swap()` in §16 already correctly uses lvalue-references for the `value_type` parameters. Also, http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0214r9.pdf uses lvalue-reference `value_type` parameters already in the `swap()` declaration in the definition of the `simd::reference` class.
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In the class definition of
simd::referencethevalue_typeparameters forswap()are rvalue references. This does not make sense;swap()mustaccept lvalue-references to
value_typeto be able to exchange the referredvalues.
The detailed description of
swap()in §16 already correctly useslvalue-references for the
value_typeparameters.Also, http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0214r9.pdf uses
lvalue-reference
value_typeparameters already in theswap()declarationin the definition of the
simd::referenceclass.