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Enum member `std.traits.isAggregateType`

Detect whether type T is an aggregate type.


						
				enum isAggregateType(T) = isAggregateType!(OriginalType!T);

Example

class C {}
union U {}
struct S {}
interface I {}

static assert( isAggregateType!C);
static assert( isAggregateType!U);
static assert( isAggregateType!S);
static assert( isAggregateType!I);
static assert(!isAggregateType!void);
static assert(!isAggregateType!string);
static assert(!isAggregateType!(int[]));
static assert(!isAggregateType!(C[string]));
static assert(!isAggregateType!(void delegate(int)));

enum ES : S { a = S.init }
enum EC : C { a = C.init }
enum EI : I { a = I.init }
enum EU : U { a = U.init }

static assert( isAggregateType!ES);
static assert( isAggregateType!EC);
static assert( isAggregateType!EI);
static assert( isAggregateType!EU);
}

/**
* Returns `true` if T can be iterated over using a `foreach` loop with
* a single loop variable of automatically inferred type, regardless of how
* the `foreach` loop is implemented.  This includes ranges, structs/classes
* that define `opApply` with a single loop variable, and builtin dynamic,
* static and associative arrays.
*/
enum bool isIterable(T) = is(typeof({ foreach (elem; T.init) {}

Authors

Walter Bright, Tomasz Stachowiak (isExpressions), Andrei Alexandrescu, Shin Fujishiro, Robert Clipsham, David Nadlinger, Kenji Hara, Shoichi Kato

License

Boost License 1.0.