Can Classes with Non-Static Member Initializers Be Aggregate Initialized in C ?

Aggregate Initialization for Classes with Non-Static Member Initializers

In C , aggregate initialization is a convenient syntax for initializing members of a class or struct without explicitly calling a constructor. However, the use of in-class member initializers raises the question of whether the class/struct remains an aggregate.

C 11 and Aggregate Status

According to the C 11 standard, having in-class member initializers prevents a class/struct from being considered an aggregate. This is due to the fact that member initializers resemble user-defined constructors, which are not allowed in aggregates.

struct A {
  int a = 3;
  int b = 3;
};

A a{0, 1}; // Invalid for C++11

C 14 and Aggregate Initialization

However, in C 14, this restriction was lifted. Aggregate initialization is now permitted for classes/structs with non-static member initializers. This change was made to address developer feedback and simplify the understanding of aggregate initialization.

struct A {
  int a = 3;
  int b = 3;
};

A a{0, 1}; // Valid for C++14

G Support for C 14 Aggregates

Note that G version 5.0 and later support C 14 aggregate initialization for classes/structs with non-static member initializers. However, older versions of G may not recognize this syntax.

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