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2208.std::reverse_iterator should be a literal type

Section: 24.5.1[reverse.iterators]Status:ResolvedSubmitter: Jeffrey YasskinOpened: 2012-10-30Last modified: 2017-03-12

Priority:3

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Discussion:

std::reverse_iterator::reverse_iterator(Iterator) should be constexprso that other constexpr functions can returnreverse_iterators. Of theother methods, the other constructors,base(),operator+,operator-,operator[], and the non-member operators can probably also beconstexpr.

operator* cannot be constexpr because it involves an assignment to amember variable. Discussion starting with c++std-lib-33282 indicatedthat it would be useful to make reverse_iterator a literal typedespite this restriction on its use at compile time.

Proposed resolution: