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56 lines
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<title>Conventions - The GNU C Preprocessor Internals</title>
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<a name="Conventions"></a>
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Next: <a rel="next" accesskey="n" href="Lexer.html#Lexer">Lexer</a>,
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<h2 class="unnumbered">Conventions</h2>
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<p><a name="index-interface-1"></a><a name="index-header-files-2"></a>
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cpplib has two interfaces—one is exposed internally only, and the
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other is for both internal and external use.
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<p>The convention is that functions and types that are exposed to multiple
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files internally are prefixed with ‘<samp><span class="samp">_cpp_</span></samp>’, and are to be found in
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the file <samp><span class="file">internal.h</span></samp>. Functions and types exposed to external
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clients are in <samp><span class="file">cpplib.h</span></samp>, and prefixed with ‘<samp><span class="samp">cpp_</span></samp>’. For
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historical reasons this is no longer quite true, but we should strive to
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stick to it.
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<p>We are striving to reduce the information exposed in <samp><span class="file">cpplib.h</span></samp> to the
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bare minimum necessary, and then to keep it there. This makes clear
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exactly what external clients are entitled to assume, and allows us to
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change internals in the future without worrying whether library clients
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are perhaps relying on some kind of undocumented implementation-specific
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behavior.
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