variable or field 'initArray' declared void

Projects Programming
1

Hi,

I made a small C program that compiles fine locally on my computer using gcc, but compiling for Arduino generates errors like:

error: variable or field 'initArray' declared void
error: 'Monster' was not declared in this scope
error: 'a' was not declared in this scope
...and more of the same errors

I reduced the code to only these declarations of structs and functions, which generate the errors:

#include <stdio.h>
#include <stdlib.h>

typedef struct {
  uint8_t value1;
  uint8_t value2;
  uint8_t visited;
} edge;

typedef struct {
  edge *edges;
  uint8_t used;
  uint8_t size;
} Monster;

void initArray(Monster *a, uint8_t initialSize) {
	a->edges = (edge *)malloc(initialSize * sizeof(edge));
	a->used = 0;
	a->size = initialSize;
}

void insertArray(Monster *a, edge element) {
	if (a->used == a->size) {
		a->size *= 2;
		a->edges = (edge *)realloc(a->edges, a->size * sizeof(edge));
	}
	a->edges[a->used++] = element;
}

void setup() {}

void loop() {}

What am I doing wrong?
Any help would be much appreciated.

2

It compiles for me. IDE 1.6.6

3

aarg:
It compiles for me. IDE 1.6.6

Good to know.
I'm using Sublime Text and the Stino plugin as my IDE, so I'll look into that tomorrow.

4

I get the errors using IDE V1.6.5.
(I vaguely remember seeing this problem once before, but can't remember how it was solved.)

5

Huh - didn't know you could make an anonymous struct and use it in a typedef.

In any case - maybe giving the struct a name would help:

typedef struct _Monster {
  edge *edges;
  uint8_t used;
  uint8_t size;
} Monster;
6

It indeed compiled correctly on the original Arduino IDE 1.6.8.

What fixed it for my IDE was making the following changes:

struct _edge;
struct _Monster;

typedef struct _edge {
  uint8_t value1;
  uint8_t value2;
  uint8_t visited;
} edge;

typedef struct _Monster {
  edge *edges;
  uint8_t used;
  uint8_t size;
} Monster;

void initArray(struct _Monster *a, uint8_t initialSize) {
	a->edges = (edge *)malloc(initialSize * sizeof(edge));
	a->used = 0;
	a->size = initialSize;
}

void insertArray(struct _Monster *a, struct _edge element) {
	if (a->used == a->size) {
		a->size *= 2;
		a->edges = (edge *)realloc(a->edges, a->size * sizeof(edge));
	}
	a->edges[a->used++] = element;
}

This comment from a ~10 year old thread was my solution: syntax driving me crazy - #17 by soundanalogous - Syntax & Programs - Arduino Forum