Annex C (informative) Compatibility [diff]

C.3 C++ and ISO C++ 2014 [diff.cpp14]

C.3.3 [expr]: expressions [diff.cpp14.expr]

1
#
Affected subclauses: [expr.post.incr] and [expr.pre.incr]
Change: Remove increment operator with bool operand.

Rationale: Obsolete feature with occasionally surprising semantics.

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++.
2
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Affected subclauses: [expr.new] and [expr.delete]
Change: Dynamic allocation mechanism for over-aligned types.

Rationale: Simplify use of over-aligned types.

Effect on original feature: In C++ 2014 code that uses a new-expression 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.
In this revision of C++, ​::​operator new(std​::​size_t, std​::​align_val_t) is used instead.