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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)
				 = is(typeof(()
{
S foo = S.init;
S copy = foo;
}
));

Parameters

Name	Description
S	The type to check.

Returns

true if S can be copied. false otherwise.

Example

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[]));

Authors

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

License

Boost License 1.0.