Re: Reset all Members of a Aggregate Instance

[Jakob Ovrum via Digitalmars-d-learn]

On Thursday, 3 December 2015 at 21:04:00 UTC, Nordlöw wrote:
Given
    class C
    {
        // lots of members
    }

and a function

    f(C c)
    {
    }

is there a generic way, perhaps through reflection, to reset 
(inside f) all members of `c` to their default values? 
Something along

    foreach(ref member; __traits(allMembers, c))
    {
        member = typeof(member).init;
    }

import std.traits;

foreach(i, member; FieldNameTuple!C)
{
    alias FieldType = Fields!C[i];
    static if(isMutable!FieldType)
        __traits(getMember, c, member) = FieldType.init;
}

However, it doesn't work in the presence of private fields. A 
better alternative is probably to `destroy` the instance then 
`emplace` to default-construct a new instance over it.