update preprocessor documentation #52
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| The following aspects of the preprocessor can be controlled: | ||
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| * **<DocLink src="/cpp/preprocessor/impl">implementation-defined</DocLink>** behavior (controlled by directive `#pragma` <Revision since="C++11">and operator `_Pragma` </Revision>). In addition, some compilers support (to varying degrees) the operator `__pragma` as a *non-standard* extension. |
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I think it would be clearer not to say "non-standard extension", because almost nothing can be considered as "standard extension". It would make more sense to say "conforming/conformant extension". But given a large number of extensions are conforming, I think we should only additionally note non-conforming cases.
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| * **<DocLink src="/cpp/preprocessor/impl">implementation-defined</DocLink>** behavior (controlled by directive `#pragma` <Revision since="C++11">and operator `_Pragma` </Revision>). In addition, some compilers support (to varying degrees) the operator `__pragma` as a *non-standard* extension. | |
| * **<DocLink src="/cpp/preprocessor/impl">implementation-defined</DocLink>** behavior (controlled by directive `#pragma` <Revision since="C++11">and operator `_Pragma` </Revision>). In addition, some compilers support (to varying degrees) the operator `__pragma` as an extension. |
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maybe that make sense. but the statement is just a copy from cppreference. i use LLM to replicate it and could not distinguish the better one.
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I just opened #71 to record this. Let's remove "non-standard" from "non-standard extension". If cppreference were editable now, I'd remove "non-standard" ASAP.
| * the `#` character. | ||
| * a sequence of: | ||
| * a standard-defined directive name (listed [below](#Capabilities)) followed by the corresponding arguments, or | ||
| * one or more <DocLink src="/cpp/language/translation_phases" anchor="Phase_3">preprocessing tokens</DocLink> where the beginning token is not a standard-defined directive name, in this case the directive is conditionally-supported with implementation-defined semantics <Revision until="C++23">(e.g. a common non-standard extension is the directive `#warning` which emits a user-defined message during compilation)</Revision>, or |
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And here.
Suggested change
| * one or more <DocLink src="/cpp/language/translation_phases" anchor="Phase_3">preprocessing tokens</DocLink> where the beginning token is not a standard-defined directive name, in this case the directive is conditionally-supported with implementation-defined semantics <Revision until="C++23">(e.g. a common non-standard extension is the directive `#warning` which emits a user-defined message during compilation)</Revision>, or | |
| * one or more <DocLink src="/cpp/language/translation_phases" anchor="Phase_3">preprocessing tokens</DocLink> where the beginning token is not a standard-defined directive name, in this case the directive is conditionally-supported with implementation-defined semantics <Revision until="C++23">(e.g. a common extension is the directive `#warning` which emits a user-defined message during compilation)</Revision>, or |
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