Re: Initialize pointer-to-struct declaration to an unnamed struct?

From:
"Victor Bazarov" <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Tue, 26 Jun 2007 20:33:29 -0400
Message-ID:
<6PSdnfx0A7bFLRzbnZ2dnUVZ_gadnZ2d@comcast.com>
Ehud Shapira wrote:

There is a huge difference between a string literal and a struct
temporary.

The struct is just as static -- it's a global definition.


No, a temporary created for the purposes of initialising something is
definitely not static. It's temporary.

You could create a static object of the struct type, and then
declare a pointer and initialise it with the address of the static
object:

That's what I'm trying to avoid; naming every linked array of structs.


<shrug> Don't name them. Have an array and get pointers to its
elements:

    struct st_a {
      int i, j;
    } a[] = { { 0, 1 }, {0, 2 } };

    struct st_b {
      int k, l;
      st_a *m;
    } b[] = {
      { 1, 2, a+0 },
      { 3, 4, a+1 }
    };

You won't have "every" element named, only one.

Another solution is to create those dynamically:

    struct st_a {
      int i, j;
    };

    st_a* make_st_a(int i, j) {
        st_a a = {i, j};
        return new st_a(a);
    }

    struct st_b {
      int k, l;
      st_a *m;
    } b[] = {
      1, 2, make_st_a(0, 1),
      3, 4, make_st_a(0, 2)
    };

If 'b' is static, you don't have to care about disposing of
those dynamic objects, a small leak like that isn't going to
hurt much. Just be aware of it.

V
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