View source code Display the source code in std/traits.d from which this page was generated on github. Improve this page Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone. Page wiki View or edit the community-maintained wiki page associated with this page.

Enum std.traits.member isAggregateType

Detect whether type T is an aggregate type.

Declaration

enum isAggregateType(T) = is(T == struct) || is(T == union) || is(T == class) || is(T == interface);

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)));
}

/**
* 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.

Comments