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Enum member std.traits.isCopyable

Determines whether the type S can be copied. If a type cannot be copied, then code such as MyStruct x; auto y = x; will fail to compile. Copying for structs can be disabled by using @disable this(this).

enum isCopyable(S) = __traits(isCopyable, S);

See also: __traits(isCopyable, S)


S The type to check.


true if S can be copied. false otherwise.


struct S1 {}                        // Fine. Can be copied
struct S2 {         this(this) {}}  // Fine. Can be copied
struct S3 {@disable this(this);  }  // Not fine. Copying is disabled.
struct S4 {S3 s;}                   // Not fine. A field has copying disabled.

class C1 {}

static assert( isCopyable!S1);
static assert( isCopyable!S2);
static assert(!isCopyable!S3);
static assert(!isCopyable!S4);

static assert(isCopyable!C1);
static assert(isCopyable!int);
static assert(isCopyable!(int[]));


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


Boost License 1.0.