Assigning to GLfloat from incompatible type void - calloc

Question

This is driving me mad. I had to GLfloat with the next assignation in the implementation of a CCNODE class that simulates watter in side view (it comes from a Class that I found in cocos2dForum)
UPDATED:
-(id)initWithBounds:(CGRect)bounds count:(int)count damping:(float)damping diffusion:(float)diffusion;
{
if((self = [super init])){
_bounds = bounds;
_count = count;
_damping = damping;
_diffusion = diffusion;
_color = ccc4f(1.0f, 1.0f, 1.0f, 1.0f);
_h1 = calloc(_count, sizeof(float));//Here
_h2 = calloc(_count, sizeof(float));// And here, is where I get the error.
WaterTexture = [[CCTextureCache sharedTextureCache] addImage:#"watter.png"];
//shader_ = [[CCShaderCache sharedShaderCache] programForKey:kCCShader_Position_uColor];
shader_ = [[CCShaderCache sharedShaderCache] programForKey:kCCShader_PositionTexture];
_textureLocation = glGetUniformLocation(shader_->_program, "u_texture");
texturesize= 256*CC_CONTENT_SCALE_FACTOR();
offset=0;
}
return self;
}
- (void)dealloc
{
free(_h1);
free(_h2);
[super dealloc];
}
This class is implemented in a Cocos3d Project. Before add the Box2d library, all was working fine,the water was simulated, but after add the Box2D library, XCode begin to complain saying "Asigning to GLfloat from incompatible type void"
Why is this happening? It is really rare...
Regards.
Carlos.

Answer 1

I assume _h1 is of type CGFloat* or CGFloat[] - if it is not a pointer type then that's one issue. The other thing is that calloc returns void* so you need to cast its return value:
_h1 = (CGFloat*)calloc(..);
That the error occurs after adding Box2D is most likely due to the Objective-C++ behaving differently than the Objective-C compiler, apparently it does not perform an implicit cast in this case, requiring you to manually add the cast. Perhaps though the compiler already warned you about it, but now it's regarded as an error (hence the advice: never ignore warnings!).