Add Optional based on variantSrc::variant#806
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LGTM. Minor points added as comments.
Can you please add test coverage for openPMD::auxiliary::Option in test/AuxiliaryTest.cpp?
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test/AuxiliaryTest.cpp
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| Option<int> opt; | ||
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| REQUIRE_THROWS(opt.get()); |
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This line calls std::terminate() while throwing mpark::throw_bad_variant_access in GCC 4.8 and 4.9.
For some reason, MPARK_EXCEPTIONS is not defined for this:
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PR: mpark/variant#76
Will push a work-around here and unify the variant include, to avoid potential ODR issues.
Add unit tests for `auxiliary::Option`
Enable exceptions with older GCC. See upstream PR for release 1.4.0.
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Adds a class template
openPMD::auxiliary::Optionto provide for somewhat the same functionality as C++17'sstd::optionaland uses it in several places in the ADIOS2 backend. Close #563.