libutil: add a result type using boost outcome
we're using boost::outcome rather than leaf or stl types because stl types are not available everywhere and leaf does not provide its own storage for error values, relying on thread-locals and the stack. if we want to use promises we won't have a stack and would have to wrap everything into leaf-specific allocating wrappers, so outcome it is. Change-Id: I35111a1f9ed517e7f12a839e2162b1ba6a993f8f
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@ -105,6 +105,7 @@ libutil_headers = files(
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'regex-combinators.hh',
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'regex.hh',
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'repair-flag.hh',
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'result.hh',
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'serialise.hh',
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'shlex.hh',
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'signals.hh',
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24
src/libutil/result.hh
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24
src/libutil/result.hh
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@ -0,0 +1,24 @@
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#pragma once
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/// @file
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#include <boost/outcome/std_outcome.hpp>
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#include <boost/outcome/std_result.hpp>
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#include <boost/outcome/success_failure.hpp>
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#include <exception>
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namespace nix {
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template<typename T, typename E = std::exception_ptr>
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using Result = boost::outcome_v2::std_result<T, E>;
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template<typename T, typename D, typename E = std::exception_ptr>
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using Outcome = boost::outcome_v2::std_outcome<T, D, E>;
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namespace result {
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using boost::outcome_v2::success;
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using boost::outcome_v2::failure;
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}
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}
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