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Initializing structs

Started by nickwinters Nov 1, 2004 at 6:17 PM 3 replies 450+ views

Original Post

Nov 1, 2004 at 6:17 PM

I have the following struct:

struct Vertex
{
	float x, y, z;
	float nx, ny, nz;
	float tu, tv;
};

What's wrong with the following instantiations?

Vertex v[3];
v[0]={-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f};
v[1]={0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f};
v[2]={1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f};

Thanks. -Nick

SiCrane

Nov 1, 2004 at 6:31 PM

Aggregate initializers (the curly brace style initializers) can only be used when declaring the variable. You'd need to change the declaration to something like:

  Vertex v[3] = {    {-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},    {0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f},    {1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f} };

if you want to use the aggregate initializer form.

nickwinters

Nov 1, 2004 at 6:47 PM

That worked. Thanks.

flangazor

Nov 2, 2004 at 6:51 AM

Original post by SiCrane
Aggregate initializers (the curly brace style initializers) can only be used when declaring the variable. You'd need to change the declaration to something like:
  Vertex v[3] = {    {-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},    {0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f},    {1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f} };
if you want to use the aggregate initializer form.[/quote]
  enum  {    X=0,    Y,    Z,    NUM_CORDS  }  Vertex v[NUM_COORDS] = {    {-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},    {0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f},    {1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f} };
Self-documenting. Assumes that this is what the 3 was for -otherwise feel free to rewrite my stub.

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