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Enum member `std.bitmanip.taggedClassRef`

This string mixin generator allows one to create tagged class reference inside structs and classes.



enum taggedClassRef(T, string name, Ts...)
= createTaggedReference!(T, 8, name, Ts);

A tagged class reference uses the bits known to be zero in a normal class reference to store extra information. For example, a pointer to an integer must be 4-byte aligned, so there are 2 bits that are always known to be zero. One can store a 2-bit integer there.

The example above creates a tagged reference to an Object in the struct A. This expects the same parameters as taggedPointer, except the first argument which must be a class type instead of a pointer type.

Example

struct A
{
    int a;
    mixin(taggedClassRef!(
        Object, "o",
        uint, "i", 2));
}
A obj;
obj.o = new Object();
obj.i = 3;

Authors

Walter Bright, Andrei Alexandrescu, Jonathan M Davis, Alex Rønne Petersen, Damian Ziemba, Amaury SECHET

License

Boost License 1.0.