From Jason Turner

[diff.cpp03.temp]

C++17 → C++20 2.7 KB 41 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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- ### Clause [[temp]]: templates <a id="diff.cpp03.temp">[[diff.cpp03.temp]]</a>
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- [[temp.param]] **Change:** Remove `export`. **Rationale:** No
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- implementation consensus. **Effect on original feature:** A valid
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- C++03declaration containing `export` is ill-formed in this International
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- Standard.
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- [[temp.arg]] **Change:** Remove whitespace requirement for nested
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- closing template right angle brackets. **Rationale:** Considered a
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- persistent but minor annoyance. Template aliases representing non-class
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- types would exacerbate whitespace issues. **Effect on original
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- feature:** Change to semantics of well-defined expression. A valid
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- C++03expression containing a right angle bracket (“`>`”) followed
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- immediately by another right angle bracket may now be treated as closing
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- two templates. For example, the following code is valid in C++03because
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- “`>>`” is a right-shift operator, but invalid in this International
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- Standard because “`>>`” closes two templates.
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  ``` cpp
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  template <class T> struct X { };
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  template <int N> struct Y { };
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  X< Y< 1 >> 2 > > x;
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  ```
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- [[temp.dep.candidate]] **Change:** Allow dependent calls of functions
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- with internal linkage. **Rationale:** Overly constrained, simplify
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- overload resolution rules. **Effect on original feature:** A valid
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- C++03program could get a different result than this International
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- Standard.
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+ ### [[temp]]: templates <a id="diff.cpp03.temp">[[diff.cpp03.temp]]</a>
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+ **Change:** Remove `export`. **Rationale:** No implementation consensus.
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+ **Effect on original feature:** A valid C++03 declaration containing
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+ `export` is ill-formed in this International Standard.
 
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+ **Change:** Remove whitespace requirement for nested closing template
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+ right angle brackets. **Rationale:** Considered a persistent but minor
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+ annoyance. Template aliases representing non-class types would
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+ exacerbate whitespace issues. **Effect on original feature:** Change to
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+ semantics of well-defined expression. A valid C++03 expression
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+ containing a right angle bracket (“`>`”) followed immediately by another
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+ right angle bracket may now be treated as closing two templates. For
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+ example, the following code is valid in C++03 because “`>>`” is a
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+ right-shift operator, but invalid in this International Standard because
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+ “`>>`” closes two templates.
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  ``` cpp
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  template <class T> struct X { };
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  template <int N> struct Y { };
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  X< Y< 1 >> 2 > > x;
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  ```
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+ **Change:** Allow dependent calls of functions with internal linkage.
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+ **Rationale:** Overly constrained, simplify overload resolution rules.
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+ **Effect on original feature:** A valid C++03 program could get a
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+ different result than this International Standard.
 
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