docs/contributing: add #pragma once
to Coding Conventions
This supersedes the older include guard mechanism since all the compilers now support it. It's easier for new users and less prone to error.
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@ -70,6 +70,7 @@ Most of our style is pretty easy to pick up on, but right now it's not entirely
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* Do not write obvious comments
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* If you not sure if a comment is obvious, go ahead and include it.
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* In general we don't wrap lines, they can be as long as needed. If you do choose to wrap lines please do not wrap any wider than 76 columns.
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* We use `#pragma once` at the start of header files rather than old-style include guards (`#ifndef THIS_FILE_H`, `#define THIS_FILE_H`, ..., `#endif`)
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# General Guidelines
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