[jira] [Created] (ARROW-7896) [C++] Refactor from #include guards to #pragma once

[Ben Kietzman (Jira)]

Ben Kietzman created ARROW-7896:
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             Summary: [C++] Refactor from #include guards to #pragma once
                 Key: ARROW-7896
                 URL: https://issues.apache.org/jira/browse/ARROW-7896
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
    Affects Versions: 0.16.0
            Reporter: Ben Kietzman
            Assignee: Ben Kietzman
             Fix For: 1.0.0


All compilers we support handle {{#pragma once}} correctly, and it reduces our 
header boilerplate.



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