From Jason Turner

[diff.cpp14.expr]

C++17 → C++20 2.1 KB 32 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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C++ Weekly: Ep 182

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- ### Clause [[expr]]: expressions <a id="diff.cpp14.expr">[[diff.cpp14.expr]]</a>
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- [[expr.post.incr]], [[expr.pre.incr]] **Change:** Remove increment
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- operator with `bool` operand. **Rationale:** Obsolete feature with
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- occasionally surprising semantics. **Effect on original feature:** A
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- valid C++14expression utilizing the increment operator on a `bool`
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- lvalue is ill-formed in this International Standard. Note that this
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- might occur when the lvalue has a type given by a template parameter.
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- [[expr.new]], [[expr.delete]] **Change:** Dynamic allocation mechanism
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- for over-aligned types. **Rationale:** Simplify use of over-aligned
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- types. **Effect on original feature:** In C++14code that uses a
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- *new-expression* to allocate an object with an over-aligned class type,
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- where that class has no allocation functions of its own,
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- `::operator new(std::size_t)` is used to allocate the memory. In this
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- International Standard, `::operator new(std::size_t, std::align_val_t)`
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- is used instead.
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+ ### [[expr]]: expressions <a id="diff.cpp14.expr">[[diff.cpp14.expr]]</a>
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+ **Change:** Remove increment operator with `bool` operand.
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+ **Rationale:** Obsolete feature with occasionally surprising semantics.
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+ **Effect on original feature:** A valid C++14 expression utilizing the
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+ increment operator on a `bool` lvalue is ill-formed in this
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+ International Standard. Note that this might occur when the lvalue has a
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+ type given by a template parameter.
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+ **Change:** Dynamic allocation mechanism for over-aligned types.
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+ **Rationale:** Simplify use of over-aligned types. **Effect on original
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+ feature:** In C++14 code that uses a *new-expression* to allocate an
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+ object with an over-aligned class type, where that class has no
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+ allocation functions of its own, `::operator new(std::size_t)` is used
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+ to allocate the memory. In this International Standard,
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+ `::operator new(std::size_t, std::align_val_t)` is used instead.
 
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