All tests passed 18089d769a35dfdaa14dec232bb9659d0879cc99

Implement https://github.com/boostorg/outcome/pull/2 in its proper place.

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All tests passed b8ec92205e4a7a292dbebebcc0abd5386eb2e44f

Set boostorg commit name in github actions.

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All tests passed 90675af4882e8922f772273d4115f9b69f0a10fb

Add missing hugo download to github actions.

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All tests passed 68bf2d671cc4a18e5aaf97be4424c0645a6ef3d1

Ported the tutorial to Outcome v2.2.

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All tests passed f9e7477dec473dcacec09d7af7b321f25b6aeab6

Initial round of upgrading tutorial and documentation for Outcome v2.2.

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All tests passed e0efc833d09928c8be137724037fb8ada587fdf7

Fix failure to set BOOSTORG_OUTCOME_DEPLOY_KEY in github actions.

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All tests passed a5c877cf287e880c527f070f776c0baf32e2a1f5

More Outcome 2.2 docs fixes.

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All tests passed 1993bb29af1ebe80e0413ecb51f3e712dfd93620

Merge pull request #242 from ecatmur/patch-1

Use __cpp_concepts feature test macro

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v2.1.5 Boost 1.75 release

v2.1.5 11th December 2020 (Boost 1.75) [release]

THIS IS THE FINAL RELEASE OF OUTCOME V2.1, FROM NOW ON IT IS OUTCOME V2.2

Enhancements:

• The ADL discovered event hooks have been replaced with policy-specified event hooks instead
  : This is due to brittleness (where hooks would quietly
  self-disable if somebody changed something), compiler bugs (a difference in compiler settings causes
  the wrong hooks, or some but not all hooks, to get discovered), and end user difficulty in using
  them at all. The policy-specified event hooks can be told to default to ADL discovered hooks for
  backwards compatibility: set OUTCOME_ENABLE_LEGACY_SUPPORT_FOR to less than 220 to
  enable emulation.

• Improve configuring OUTCOME_GCC6_CONCEPT_BOOL
  : Older GCCs had boolean based concepts syntax, whereas newer GCCs are standards conforming.
  However the precise logic of when to use legacy and conforming syntax was not well understood,
  which caused Outcome to fail to compile depending on what options you pass to GCC. The new logic
  always uses the legacy syntax if on GCC 8 or older, otherwise we use conforming syntax if and
  only if GCC is in C++ 20 mode or later. This hopefully will resolve the corner case build
  failures on GCC.

Bug fixes:

• Boost.Outcome should now compile with BOOST_NO_EXCEPTIONS defined
  : Thanks to Emil, maintainer of Boost.Exception, making a change for me, Boost.Outcome
  should now compile with C++ exceptions globally disabled. You won't be able to use
  boost::exception_ptr as it can't be included if C++ exceptions are globally disabled.

• #236
  : In the Coroutine support the final_suspend() was not noexcept, despite being required
  to be so in the C++ 20 standard. This has been fixed, but only if your compiler implements
  noop_coroutine. Additionally, if noop_coroutine is available, we use the much more
  efficient coroutine handle returning variant of await_suspend() which should significantly
  improve codegen and context switching performance.

All tests passed b970251b899adc46c8d794f5218502bdcf514b32

Ported boostorg/outcome conversion script to github actions.

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