Annex C (informative) Compatibility [diff]

Affected subclause: [dcl.init.aggr]
Change: Classes with default member initializers can be aggregates.

Rationale: Necessary to allow default member initializers to be used by aggregate initialization.

Effect on original feature: Valid C++ 2011 code may fail to compile or may change meaning in this International Standard.

For example:

struct S { // Aggregate in C++ 2014 onwards.
  int m = 1;
};
struct X {
  operator int();
  operator S();
};
X a{};
S b{a};  // uses copy constructor in C++ 2011,
         // performs aggregate initialization in this International Standard