dynCastMove

Dynamic cast for shared pointers if ElementType is class with D linkage.

Move instance of SharedPtr whose stored pointer is obtained from ptr's stored pointer using a dynaic cast expression.

If ptr is null or dynamic cast fail then result SharedPtr is null. Otherwise, the new SharedPtr will share ownership with the initial value of ptr.

UnqualSmartPtr!Ptr.ChangeElementType!T

dynCastMove

(

Ptr

)

(

scope auto ref Ptr ptr

)

if (

isSharedPtr!Ptr &&

!is(Ptr == shared)

!Ptr.isWeak

isClassOrInterface!T

__traits(getLinkage, T) == "D"

isClassOrInterface!(Ptr.ElementType)

__traits(getLinkage, Ptr.ElementType) == "D"

)

Examples

static class Foo{
	int i;

	this(int i)pure nothrow @safe @nogc{
		this.i = i;
	}
}

static class Bar : Foo{
	double d;

	this(int i, double d)pure nothrow @safe @nogc{
		super(i);
		this.d = d;
	}
}

static class Zee{
}

{
	SharedPtr!(const Foo) foo = SharedPtr!Bar.make(42, 3.14);
	assert(foo.get.i == 42);

	auto bar = dynCastMove!Bar(foo);
	assert(foo == null);
	assert(bar != null);
	assert(bar.get.d == 3.14);
	static assert(is(typeof(bar) == SharedPtr!(const Bar)));

	auto zee = dynCastMove!Zee(bar);
	assert(zee == null);
	assert(bar != null);
	static assert(is(typeof(zee) == SharedPtr!(const Zee)));
}

dynCastMove

Examples

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