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add maybe concept and maybe_view#1659

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huixie90 wants to merge 4 commits intoericniebler:masterericniebler/range-v3:masterfrom huixie90:maybehuixie90/range-v3:maybeCopy head branch name to clipboard

+549

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Commits on Sep 20, 2021

• add maybe_view

  huixie90

  committed
  888d7f0

• formatting maybe

  huixie90

  committed
  c09cf0e

• fixing test failures

  huixie90

  committed
  659c604

• fixing build failures in c++20 mode

  huixie90

  committed
  7091255