From Jason Turner

[diff.cpp14.lex]

C++20 → C++23 1.8 KB 17 lines
Current Draft | LaTeX Source
Archived: C++20 | C++23
Markdown: C++20 | C++23
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tmp/tmp1onbkl7o/{from.md → to.md} RENAMED
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  **Change:** Removal of trigraph support as a required feature.
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  **Rationale:** Prevents accidental uses of trigraphs in non-raw string
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  literals and comments. **Effect on original feature:** Valid C++14 code
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  that uses trigraphs may not be valid or may have different semantics in
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- this International Standard. Implementations may choose to translate
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- trigraphs as specified in C++14 if they appear outside of a raw string
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- literal, as part of the *implementation-defined* mapping from physical
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- source file characters to the basic source character set.
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  **Change:** *pp-number* can contain `p` *sign* and `P` *sign*.
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  **Rationale:** Necessary to enable
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  *hexadecimal-floating-point-literal*s. **Effect on original feature:**
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  Valid C++14 code may fail to compile or produce different results in
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- this International Standard. Specifically, character sequences like
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- `0p+0` and `0e1_p+0` are three separate tokens each in C++14, but one
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- single token in this International Standard. For example:
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  ``` cpp
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  #define F(a) b ## a
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  int b0p = F(0p+0); // ill-formed; equivalent to ``int b0p = b0p + 0;'' in C++14{}
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  ```
 
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  **Change:** Removal of trigraph support as a required feature.
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  **Rationale:** Prevents accidental uses of trigraphs in non-raw string
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  literals and comments. **Effect on original feature:** Valid C++14 code
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  that uses trigraphs may not be valid or may have different semantics in
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+ this revision of C++. Implementations may choose to translate trigraphs
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+ as specified in C++14 if they appear outside of a raw string literal, as
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+ part of the *implementation-defined* mapping from input source file
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+ characters to the translation character set.
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  **Change:** *pp-number* can contain `p` *sign* and `P` *sign*.
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  **Rationale:** Necessary to enable
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  *hexadecimal-floating-point-literal*s. **Effect on original feature:**
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  Valid C++14 code may fail to compile or produce different results in
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+ this revision of C++. Specifically, character sequences like `0p+0` and
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+ `0e1_p+0` are three separate tokens each in C++14, but one single token
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+ in this revision of C++. For example:
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  ``` cpp
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  #define F(a) b ## a
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  int b0p = F(0p+0); // ill-formed; equivalent to ``int b0p = b0p + 0;'' in C++14{}
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  ```