CODEWITHSUNDEEP
c++struct
Cherple
Cherple

Reputation: 791

C++ Struct - Error 1 error C2143: syntax error : missing ';' before '*'

when i try to compile the following, i receive the error "Error 1 error C2143: syntax error : missing ';' before '*'". Does anyone know why am i receiving this error? What am i doing wrong here?

struct HE_edge {
HE_vert* vert; // vertex at the end of the half-edge<br>
HE_edge* pair; // oppositely oriented half-edge<br>
HE_face* face; // the incident face<br>
HE_edge* prev; // previous half-edge around the face<br>
HE_edge* next; // next half-edge around the face<br>
};

struct HE_vert {
float x, y, z; // the vertex coordinates<br>
HE_edge* edge; // one of the half-edges emanating from the vertex<br>
};

struct HE_face {
HE_edge* edge; // one of the half-edges bordering the face<br>
};

Upvotes: 1

Views: 3519

Answers (5)

juanchopanza
juanchopanza

Reputation: 227608

You need to forward declare HE_vert and HE_face before you use them in HE_edge.

// fwd declarations. Can use "struct" or "class" interchangeably.
struct HE_vert;
struct HE_face;

struct HE_edge { /* as before */ };

See When to use forward declaration?

Upvotes: 2

Thomas Benard
Thomas Benard

Reputation: 210

Try to declare your structs in the right order : Since HE_edge depends on HE_vert and HE_face, declare them before.

struct HE_vert;
struct HE_face;

struct HE_edge {
HE_vert* vert; // vertex at the end of the half-edge<br>
HE_edge* pair; // oppositely oriented half-edge<br>
HE_face* face; // the incident face<br>
HE_edge* prev; // previous half-edge around the face<br>
HE_edge* next; // next half-edge around the face<br>
};

struct HE_vert {
float x, y, z; // the vertex coordinates<br>
HE_edge* edge; // one of the half-edges emanating from the vertex<br>
};

struct HE_face {
HE_edge* edge; // one of the half-edges bordering the face<br>
};

Upvotes: 4

Raxvan
Raxvan

Reputation: 6515

The first declaration has no idea what HE_vert and HE_face is, to you need to tell the compiler what are those:

struct HE_face;
struct HE_vert;//tell compiler what are HE_vert and HE_face

struct HE_edge {
HE_vert* vert; // vertex at the end of the half-edge<br>
HE_edge* pair; // oppositely oriented half-edge<br>
HE_face* face; // the incident face<br>
HE_edge* prev; // previous half-edge around the face<br>
HE_edge* next; // next half-edge around the face<br>
};

struct HE_vert {
float x, y, z; // the vertex coordinates<br>
HE_edge* edge; // one of the half-edges emanating from the vertex<br>
};

struct HE_face {
HE_edge* edge; // one of the half-edges bordering the face<br>
};

Razvan.

Upvotes: 1

Some programmer dude
Some programmer dude

Reputation: 409482

You must declare identifiers before you use them. For structures this is simply done by e.g.

struct HE_vert;

Place that before the definition of HE_edge.

Upvotes: 1

Kerrek SB
Kerrek SB

Reputation: 477640

You need to declare all the classes before you use their types to make pointers:

struct HE_edge;
struct HE_vert;
struct HE_face;

// your code

Upvotes: 1

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