Re: need help to get member function const address

[Calvin P via Digitalmars-d-learn]

On Monday, 16 March 2020 at 18:43:47 UTC, Steven Schveighoffer 
wrote:

enum A0 = &A.d;
Note that you can't call it at all, but you can get the 
function pointer, and put it into a delegate later by assigning 
.funcptr.

void main()
{
    A a;
    void delegate() dg;
    dg.ptr = &a;
    dg.funcptr = A0;
    dg(); // calls a.d()
}

-Steve

Thanks for the tips, Steve.

I need to put them into a big const struct to use on runtime,  so 
they can not be modify on runtime by mistake.

I can not put the address into enum,  because  Error: need this 
to access d

add cast(void*) still get same error:

enum callee_ptr = cast(void*) &(__traits(getMember, A, "d")); //  
Error: need this to access d

but I come up with a workaround:

static void* getCallee() pure @nogc nothrow {
                enum callee_ptr = &(__traits(getMember, App, name));
                return callee_ptr;
}

__gshared const AppHelper  APP_HELPER = {&getCallee,  ..};