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Enum member std.traits.isAggregateType

Detect whether type T is an aggregate type.

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 <code class="lang-d"><span class="kwd">true</span></code> if T can be iterated over using a <code class="lang-d"><span class="kwd">foreach</span></code> loop with
* a single loop variable of automatically inferred type, regardless of how
* the <code class="lang-d"><span class="kwd">foreach</span></code> loop is implemented.  This includes ranges, structs/classes
* that define <code class="lang-d"><span class="pln">opApply</span></code> with a single loop variable, and builtin dynamic,
* static and associative arrays.
*/
enum bool isIterable(T) = is(typeof({ foreach (elem; T.init) {}
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Authors

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

License

Boost License 1.0.