[diff.cpp14.expr]

# Annex C (informative) Compatibility [[diff]](./#diff)

## C.4 C++ and ISO C++ 2014 [[diff.cpp14]](diff.cpp14#expr)

### C.4.3 [[expr]](expr "7 Expressions"): expressions [diff.cpp14.expr]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L1638)

**Affected subclauses:** [[expr.post.incr]](expr.post.incr) and [[expr.pre.incr]](expr.pre.incr)  


**Change:** Remove increment operator with bool operand[.](#1.sentence-1)

  


**Rationale:** Obsolete feature with occasionally surprising semantics[.](#1.sentence-2)

  


**Effect on original feature:** A valid C++ 2014 expression utilizing the increment operator on
a bool lvalue is ill-formed in this revision of C++[.](#1.sentence-3)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L1647)

**Affected subclauses:** [[expr.new]](expr.new) and [[expr.delete]](expr.delete)  


**Change:** Dynamic allocation mechanism for over-aligned types[.](#2.sentence-1)

  


**Rationale:** Simplify use of over-aligned types[.](#2.sentence-2)

  


**Effect on original feature:** In C++ 2014 code that uses a [*new-expression*](expr.new#nt:new-expression "7.6.2.8 New [expr.new]") to allocate an object with an over-aligned class type,
where that class has no allocation functions of its own,​::​operator new(std​::​size_t) is used to allocate the memory[.](#2.sentence-3)

In this revision of C++,​::​operator new(std​::​size_t, std​::​align_val_t) is used instead[.](#2.sentence-4)
